title
Iterator Design Pattern

description
Get the Code: http://goo.gl/yODM3 Welcome to my Iterator Design Pattern Tutorial! The iterator design pattern allows you to access objects that are stored in many different collection types. You do this by creating a common interface that these classes share. Then you have them provide you with an iterator that allows you to traverse the objects they contain. Because they all share a common interface you can treat them polymorphically and eliminate a lot of duplicate code.

detail
{'title': 'Iterator Design Pattern', 'heatmap': [{'end': 987.174, 'start': 957.018, 'weight': 1}], 'summary': 'Explores the iterator design pattern, providing a uniform way to access collections of objects and demonstrating its implementation in java for song information retrieval from different decades, emphasizing the use of array lists and the creation of a disc jockey class.', 'chapters': [{'end': 51.364, 'segs': [{'end': 51.364, 'src': 'embed', 'start': 16.104, 'weight': 0, 'content': [{'end': 22.627, 'text': 'So, for example, if you get an array, an array list and a hash table that are all full of the same type of objects,', 'start': 16.104, 'duration': 6.523}, {'end': 25.889, 'text': 'you could pop out an iterator for each and treat them the same.', 'start': 22.627, 'duration': 3.262}, {'end': 31.291, 'text': 'What this does for you is provides a uniform way to cycle through all of these different types of collections.', 'start': 26.029, 'duration': 5.262}, {'end': 38.835, 'text': "And on top of that, you're also going to be able to write polymorphic code, because you can refer to each collection of objects in the same way,", 'start': 31.471, 'duration': 7.364}, {'end': 41.816, 'text': 'because they are going to implement the same interface.', 'start': 38.835, 'duration': 2.981}, {'end': 44.058, 'text': "Now if that sounds confusing, don't worry about it.", 'start': 42.116, 'duration': 1.942}, {'end': 47.781, 'text': 'I think this is 100% understandable if you just watch an example.', 'start': 44.218, 'duration': 3.563}, {'end': 51.364, 'text': "So what I'm going to do is just jump directly right into the code.", 'start': 48.021, 'duration': 3.343}], 'summary': 'Using iterators provides a uniform way to cycle through different collections, enabling polymorphic code. 100% understandable with an example.', 'duration': 35.26, 'max_score': 16.104, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag16104.jpg'}], 'start': 0.069, 'title': 'Iterator design pattern', 'summary': 'Explores the iterator design pattern, which provides a uniform way to access different types of collections of objects, enabling writing of polymorphic code and implementation of the same interface for cycling through various collections such as array, array list, and hash table.', 'chapters': [{'end': 51.364, 'start': 0.069, 'title': 'Iterator design pattern', 'summary': 'Explores the iterator design pattern, providing a uniform way to access different types of collections of objects such as array, array list, and hash table, enabling the writing of polymorphic code and implementation of the same interface for cycling through various collections.', 'duration': 51.295, 'highlights': ['The iterator design pattern provides a uniform way to access different types of collections of objects. This pattern allows for uniform cycling through different types of collections like array, array list, and hash table.', 'It enables the writing of polymorphic code and implementation of the same interface for cycling through various collections. This feature allows for writing code that can refer to each collection of objects in the same way, as they implement the same interface.']}], 'duration': 51.295, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag69.jpg', 'highlights': ['The iterator design pattern provides a uniform way to access different types of collections of objects.', 'It enables the writing of polymorphic code and implementation of the same interface for cycling through various collections.']}, {'end': 296.318, 'segs': [{'end': 113.947, 'src': 'embed', 'start': 51.884, 'weight': 0, 'content': [{'end': 52.985, 'text': 'Okay, so here we are.', 'start': 51.884, 'duration': 1.101}, {'end': 56.648, 'text': "So in this situation, I'm going to use a kind of real world example.", 'start': 53.165, 'duration': 3.483}, {'end': 65.435, 'text': "Let's say you wanted to get information from the top 70s, the top 80s, and the top 90s disc jockeys, people that play music on the radio.", 'start': 56.828, 'duration': 8.607}, {'end': 70.958, 'text': 'And as a programmer, what you tell them is you want them to provide you with an object,', 'start': 65.815, 'duration': 5.143}, {'end': 77.082, 'text': "and each one of those objects is going to be based off of song info, which means they're going to give you a song name,", 'start': 70.958, 'duration': 6.124}, {'end': 79.644, 'text': 'a band name and the year that it was released.', 'start': 77.082, 'duration': 2.562}, {'end': 84.027, 'text': 'On top of that, now that they know this is the object they have to use,', 'start': 80.004, 'duration': 4.023}, {'end': 90.511, 'text': 'you tell them that they all must use a function named addSong for adding both the song, the band and the release.', 'start': 84.027, 'duration': 6.484}, {'end': 96.795, 'text': 'And on top of that, they have to use a function called getBestSongs that will return the collection of songs.', 'start': 90.771, 'duration': 6.024}, {'end': 101.398, 'text': 'The one thing you forgot to tell them is to use the same collection.', 'start': 97.055, 'duration': 4.343}, {'end': 107.663, 'text': 'So, in this situation, the DJ from the 70s is going to send you an array list,', 'start': 101.638, 'duration': 6.025}, {'end': 113.947, 'text': 'from the 80s is going to send you an array of these objects and then the guy from the 90s is going to send you a hash table.', 'start': 107.663, 'duration': 6.284}], 'summary': 'Programmer requests song info from 70s, 80s, and 90s djs, specifying object structure and functions, but forgets to specify using the same collection for all djs.', 'duration': 62.063, 'max_score': 51.884, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag51884.jpg'}, {'end': 157.105, 'src': 'embed', 'start': 132.892, 'weight': 5, 'content': [{'end': 140.454, 'text': "First thing we're going to do here is go to songs of the 70s and we're going to look at the type of information that we could be expecting from somebody like this.", 'start': 132.892, 'duration': 7.562}, {'end': 146.838, 'text': "Alright, so they're going to send us Java util and this guy's gonna send us an array list.", 'start': 140.735, 'duration': 6.103}, {'end': 151.521, 'text': "so we're gonna need that and a little bit later on we're gonna need the iterator library.", 'start': 146.838, 'duration': 4.683}, {'end': 153.883, 'text': 'so we might as well just put it in here right now.', 'start': 151.521, 'duration': 2.362}, {'end': 157.105, 'text': "so there we are, okay, and then we're going to create our class.", 'start': 153.883, 'duration': 3.222}], 'summary': 'Analyzing 70s songs data to extract java util and array list information for class creation.', 'duration': 24.213, 'max_score': 132.892, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag132892.jpg'}, {'end': 238.18, 'src': 'embed', 'start': 211.028, 'weight': 3, 'content': [{'end': 214.712, 'text': "We're going to have the add song method, which I'm going to create here in a second.", 'start': 211.028, 'duration': 3.684}, {'end': 218.936, 'text': "And then we're going to add another song and a final song.", 'start': 214.852, 'duration': 4.084}, {'end': 219.757, 'text': 'So there you go.', 'start': 219.077, 'duration': 0.68}, {'end': 225.463, 'text': "We're creating the array list and we're adding the song information to this guy inside of the constructor.", 'start': 219.797, 'duration': 5.666}, {'end': 228.607, 'text': "So what do we have to do now? And this is what you're going to be receiving.", 'start': 225.663, 'duration': 2.944}, {'end': 232.612, 'text': "So we'll go public and you're going to be forced to work with it in a good way.", 'start': 228.747, 'duration': 3.865}, {'end': 238.18, 'text': 'So we need to actually come in here and allow them to call the add song method.', 'start': 232.773, 'duration': 5.407}], 'summary': 'Creating and adding multiple songs to an array list for public use.', 'duration': 27.152, 'max_score': 211.028, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag211028.jpg'}], 'start': 51.884, 'title': 'Radio dj data collection and implementing song info class', 'summary': 'Discusses collecting song information from top 70s, 80s, and 90s disc jockeys in an object-based format, using specific functions for adding songs and retrieving the best songs. it also covers creating a song info class in java, utilizing array lists and the iterator design pattern to organize and manipulate song information, and emphasizing the importance of using the add song method to work with the class effectively.', 'chapters': [{'end': 113.947, 'start': 51.884, 'title': 'Radio dj data collection', 'summary': 'Discusses collecting song information from top 70s, 80s, and 90s disc jockeys in an object-based format, requiring the use of specific functions for adding songs and retrieving the best songs.', 'duration': 62.063, 'highlights': ['The requirement for collecting song information from top 70s, 80s, and 90s disc jockeys in an object-based format with specific fields like song name, band name, and release year.', 'The specification of using a function named addSong for adding songs and a function called getBestSongs for retrieving the collection of songs.', 'The varied data structures used by different DJs, such as an array list, an array of objects, and a hash table, leading to potential data format inconsistencies.']}, {'end': 296.318, 'start': 114.127, 'title': 'Implementing song info class', 'summary': 'Covers creating a song info class in java, utilizing array lists and the iterator design pattern to organize and manipulate song information, and emphasizing the importance of using the add song method to work with the class effectively.', 'duration': 182.191, 'highlights': ['The chapter emphasizes creating a Song Info class in Java, utilizing array lists and the iterator design pattern to organize and manipulate song information.', 'It demonstrates the importance of using the add song method to work with the class effectively.', 'The chapter mentions the use of Java util and array list for managing song information.', 'It highlights the process of creating a constructor for the Song Info class and adding song information within the constructor.']}], 'duration': 244.434, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag51884.jpg', 'highlights': ['The requirement for collecting song information from top 70s, 80s, and 90s disc jockeys in an object-based format with specific fields like song name, band name, and release year.', 'The specification of using a function named addSong for adding songs and a function called getBestSongs for retrieving the collection of songs.', 'The varied data structures used by different DJs, such as an array list, an array of objects, and a hash table, leading to potential data format inconsistencies.', 'The chapter emphasizes creating a Song Info class in Java, utilizing array lists and the iterator design pattern to organize and manipulate song information.', 'It demonstrates the importance of using the add song method to work with the class effectively.', 'The chapter mentions the use of Java util and array list for managing song information.', 'It highlights the process of creating a constructor for the Song Info class and adding song information within the constructor.']}, {'end': 473.15, 'segs': [{'end': 324.349, 'src': 'embed', 'start': 296.318, 'weight': 0, 'content': [{'end': 301.28, 'text': "it's actually good code, but we have to figure out how to use it for our own situation.", 'start': 296.318, 'duration': 4.962}, {'end': 306.743, 'text': "so i'm just going to copy that and then i'm going to go into songs of the 80s bounce in here, paste that in there,", 'start': 301.28, 'duration': 5.463}, {'end': 310.865, 'text': "and then we're just going to need to change this to the 80s and this to the 80s,", 'start': 306.743, 'duration': 4.122}, {'end': 317.547, 'text': "and then this guy's going to send us an array list or an array that's going to have song info items inside of it.", 'start': 310.865, 'duration': 6.682}, {'end': 319.148, 'text': "I'm going to leave all the rest of that the same.", 'start': 317.607, 'duration': 1.541}, {'end': 324.349, 'text': 'And this guy right here is going to need to be changed into a song info array.', 'start': 319.328, 'duration': 5.021}], 'summary': 'Adapting existing code for 80s songs, changing variables, and receiving an array of song info items.', 'duration': 28.031, 'max_score': 296.318, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag296318.jpg'}, {'end': 435.743, 'src': 'embed', 'start': 395.163, 'weight': 1, 'content': [{'end': 398.685, 'text': "And then for Songs of the 90s, this guy's going to be sending me a hash table.", 'start': 395.163, 'duration': 3.522}, {'end': 401.407, 'text': 'So we need to get the hash table library there.', 'start': 398.905, 'duration': 2.502}, {'end': 402.808, 'text': 'Leave everything else the same.', 'start': 401.707, 'duration': 1.101}, {'end': 403.568, 'text': 'Come in here.', 'start': 402.968, 'duration': 0.6}, {'end': 404.889, 'text': 'These guys are going to change.', 'start': 403.808, 'duration': 1.081}, {'end': 417.976, 'text': "because we're going to be holding a hash table that's going to have an integer object inside of there as the key and then song info as the actual value and I'm going to call it best songs,", 'start': 405.189, 'duration': 12.787}, {'end': 424.879, 'text': "just like before is equal to new, and then it's going to be hash table, exactly the same here as we have on the left side,", 'start': 417.976, 'duration': 6.903}, {'end': 427.52, 'text': "except we're going to go like this and like that.", 'start': 424.879, 'duration': 2.641}, {'end': 433.402, 'text': "so that's going to create our hash table for us, and then we're also going to increment the hash key here,", 'start': 427.52, 'duration': 5.882}, {'end': 435.743, 'text': "and i'm going to give it an initial value of zero.", 'start': 433.402, 'duration': 2.341}], 'summary': "Creating a hash table for 'songs of the 90s' with integer keys and song info values, initializing with hash key zero.", 'duration': 40.58, 'max_score': 395.163, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag395163.jpg'}], 'start': 296.318, 'title': 'Modifying code for different decades', 'summary': 'Discusses modifying code to create song info arrays for the 80s and 90s, including changing data types and incrementing array/hash keys. it also involves copying and pasting code, making adjustments, and incrementing values for the arrays and hash tables.', 'chapters': [{'end': 473.15, 'start': 296.318, 'title': 'Modifying code for different decades', 'summary': 'Discusses modifying code to create song info arrays for the 80s and 90s, including changing data types and incrementing array/hash keys. it also involves copying and pasting code, making adjustments, and incrementing values for the arrays and hash tables.', 'duration': 176.832, 'highlights': ['The chapter demonstrates modifying code to create song info arrays for the 80s and 90s, including changing data types and incrementing array/hash keys.', 'It involves copying and pasting code, making adjustments, and incrementing values for the arrays and hash tables.', 'The process includes modifying code to handle different data structures such as arrays and hash tables, and incrementing values to populate the arrays and hash tables.', 'The chapter also involves creating and populating hash tables to store song information for the 90s, using methods to add elements and increment hash keys.']}], 'duration': 176.832, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag296318.jpg', 'highlights': ['The chapter demonstrates modifying code to create song info arrays for the 80s and 90s, including changing data types and incrementing array/hash keys.', 'The process includes modifying code to handle different data structures such as arrays and hash tables, and incrementing values to populate the arrays and hash tables.', 'The chapter also involves creating and populating hash tables to store song information for the 90s, using methods to add elements and increment hash keys.', 'It involves copying and pasting code, making adjustments, and incrementing values for the arrays and hash tables.']}, {'end': 592.888, 'segs': [{'end': 535.307, 'src': 'embed', 'start': 490.315, 'weight': 0, 'content': [{'end': 492.455, 'text': "It's going to handle putting all this stuff together.", 'start': 490.315, 'duration': 2.14}, {'end': 495.776, 'text': "So I'm going to need to get a whole bunch of different libraries in here.", 'start': 492.695, 'duration': 3.081}, {'end': 499.297, 'text': 'Till array list and enumeration.', 'start': 495.976, 'duration': 3.321}, {'end': 501.578, 'text': 'And hash table, of course.', 'start': 499.977, 'duration': 1.601}, {'end': 504.6, 'text': "The code I'm going to show you here in a second, it definitely works.", 'start': 501.919, 'duration': 2.681}, {'end': 506.001, 'text': "It's just not neat.", 'start': 504.74, 'duration': 1.261}, {'end': 508.963, 'text': "And it's obviously not using the iterator design pattern.", 'start': 506.322, 'duration': 2.641}, {'end': 511.665, 'text': 'And then public class, disk jockey.', 'start': 509.123, 'duration': 2.542}, {'end': 515.307, 'text': "And then it's going to go songs of the 70s.", 'start': 511.825, 'duration': 3.482}, {'end': 518.809, 'text': "And I'm just going to call this songs 70s.", 'start': 515.707, 'duration': 3.102}, {'end': 525.914, 'text': "And then I have to do exactly the same thing for our other two classes, which is the only thing that's different here is the 80s and 90s.", 'start': 518.929, 'duration': 6.985}, {'end': 529.262, 'text': "And then I'm going to go public disk jockey.", 'start': 526.84, 'duration': 2.422}, {'end': 531.203, 'text': 'Create this constructor here.', 'start': 529.502, 'duration': 1.701}, {'end': 533.926, 'text': "And then it's going to get past all of these values.", 'start': 531.404, 'duration': 2.522}, {'end': 535.307, 'text': "So let's bounce in there.", 'start': 534.026, 'duration': 1.281}], 'summary': 'Code includes handling multiple libraries and implementing iterator design pattern.', 'duration': 44.992, 'max_score': 490.315, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag490315.jpg'}, {'end': 603.682, 'src': 'embed', 'start': 576.698, 'weight': 1, 'content': [{'end': 583.122, 'text': "And I'm going to show you how you would iterate through all these different types of classes if you didn't know about the iterator design pattern.", 'start': 576.698, 'duration': 6.424}, {'end': 587.245, 'text': 'Because all of the song info objects are going to be stored in different collections.', 'start': 583.162, 'duration': 4.083}, {'end': 592.888, 'text': "everything, of course, needs to be handled on an individual basis, which is terrible, but that's what's going to happen.", 'start': 587.245, 'duration': 5.643}, {'end': 596.43, 'text': "So I'm just going to call this AL 70s songs.", 'start': 592.948, 'duration': 3.482}, {'end': 597.511, 'text': "That's an array list.", 'start': 596.49, 'duration': 1.021}, {'end': 603.682, 'text': "songs 70s dot and then I'm just gonna call get best songs okay.", 'start': 597.911, 'duration': 5.771}], 'summary': 'Demonstrating iteration through different classes without iterator design pattern for handling song info in separate collections.', 'duration': 26.984, 'max_score': 576.698, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag576698.jpg'}], 'start': 473.27, 'title': 'Implementing a disc jockey class', 'summary': 'Discusses the implementation of a disc jockey class to handle songs of the 70s, 80s, and 90s using different libraries, constructors, and the iterator design pattern.', 'chapters': [{'end': 592.888, 'start': 473.27, 'title': 'Implementing a disc jockey class', 'summary': 'Discusses the implementation of a disc jockey class to handle songs of the 70s, 80s, and 90s using different libraries, constructors, and the iterator design pattern.', 'duration': 119.618, 'highlights': ['The chapter discusses the implementation of a disc jockey class to handle songs of the 70s, 80s, and 90s.', 'The code implements handling different libraries such as array list, enumeration, and hash table for managing song collections.', 'It demonstrates the use of constructors to create the disc jockey class and assign objects for songs of different eras.', 'The chapter explores the implementation of the iterator design pattern for iterating through different song collections.']}], 'duration': 119.618, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag473270.jpg', 'highlights': ['The chapter discusses the implementation of a disc jockey class to handle songs of the 70s, 80s, and 90s.', 'The chapter explores the implementation of the iterator design pattern for iterating through different song collections.', 'The code implements handling different libraries such as array list, enumeration, and hash table for managing song collections.', 'It demonstrates the use of constructors to create the disc jockey class and assign objects for songs of different eras.']}, {'end': 921.521, 'segs': [{'end': 619.484, 'src': 'embed', 'start': 592.948, 'weight': 2, 'content': [{'end': 596.43, 'text': "So I'm just going to call this AL 70s songs.", 'start': 592.948, 'duration': 3.482}, {'end': 597.511, 'text': "That's an array list.", 'start': 596.49, 'duration': 1.021}, {'end': 603.682, 'text': "songs 70s dot and then I'm just gonna call get best songs okay.", 'start': 597.911, 'duration': 5.771}, {'end': 606.266, 'text': 'so we got our array list with all our songs in it.', 'start': 603.682, 'duration': 2.584}, {'end': 613.88, 'text': "then I'm gonna go system out, print line And I'm going to say songs of the 70s and then throw a new line in there on top of that,", 'start': 606.266, 'duration': 7.614}, {'end': 614.581, 'text': 'just for the heck of it.', 'start': 613.88, 'duration': 0.701}, {'end': 618.063, 'text': "And then what do I need to do? Well, I'm going to create a for loop here.", 'start': 614.741, 'duration': 3.322}, {'end': 619.484, 'text': 'i is equal to zero.', 'start': 618.083, 'duration': 1.401}], 'summary': 'Creating an array list of 70s songs and using a for loop to iterate through the list.', 'duration': 26.536, 'max_score': 592.948, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag592948.jpg'}, {'end': 729.71, 'src': 'embed', 'start': 700.712, 'weight': 1, 'content': [{'end': 702.955, 'text': "So you're not never going to do this after this tutorial.", 'start': 700.712, 'duration': 2.243}, {'end': 707.841, 'text': "Now we need to do a similar thing except this time we're going to do it with an array.", 'start': 703.075, 'duration': 4.766}, {'end': 710.102, 'text': 'This is no longer an array list.', 'start': 708.241, 'duration': 1.861}, {'end': 712.523, 'text': "It's going to be song info like that.", 'start': 710.202, 'duration': 2.321}, {'end': 715.824, 'text': "And I'm just going to call this array 80 songs.", 'start': 712.963, 'duration': 2.861}, {'end': 717.325, 'text': 'Change this to 80s.', 'start': 716.204, 'duration': 1.121}, {'end': 718.545, 'text': 'Get best songs.', 'start': 717.685, 'duration': 0.86}, {'end': 719.826, 'text': "All that's going to work still.", 'start': 718.605, 'duration': 1.221}, {'end': 721.186, 'text': 'Change this to 80s.', 'start': 720.146, 'duration': 1.04}, {'end': 724.468, 'text': "And then this guy, we're going to be going through an array now.", 'start': 721.566, 'duration': 2.902}, {'end': 725.908, 'text': 'So paste that in there.', 'start': 724.708, 'duration': 1.2}, {'end': 727.889, 'text': "And then this time we're going to call length.", 'start': 726.188, 'duration': 1.701}, {'end': 729.71, 'text': "because that's what you do with an array.", 'start': 728.129, 'duration': 1.581}], 'summary': 'The tutorial involves working with an array to retrieve song info and utilize array methods like length.', 'duration': 28.998, 'max_score': 700.712, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag700712.jpg'}, {'end': 869.149, 'src': 'embed', 'start': 835.968, 'weight': 0, 'content': [{'end': 839.949, 'text': "i'm going to go into radiostation.java, and this is going to work very easily.", 'start': 835.968, 'duration': 3.981}, {'end': 847.654, 'text': "we're going to go public class radio station and then we're going to go public static void, main string.", 'start': 839.949, 'duration': 7.705}, {'end': 853.438, 'text': "there's that args and then i'm going to go songs of the 70s.", 'start': 847.654, 'duration': 5.784}, {'end': 857.881, 'text': 'songs. 70s is equal to new songs of the 70s.', 'start': 853.438, 'duration': 4.443}, {'end': 860.943, 'text': "so we're going to create this object here right like that.", 'start': 857.881, 'duration': 3.062}, {'end': 869.149, 'text': "so very simple, still pretty neat, and then we're going to do exactly the same thing for songs the 80s as well as the 90s, and there and there,", 'start': 860.943, 'duration': 8.206}], 'summary': 'Creating radiostation.java to handle songs of the 70s, 80s, and 90s.', 'duration': 33.181, 'max_score': 835.968, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag835968.jpg'}, {'end': 933.976, 'src': 'embed', 'start': 906.476, 'weight': 3, 'content': [{'end': 910.637, 'text': 'Songs of the 80s and Rome and all these other different things and songs of the 90s.', 'start': 906.476, 'duration': 4.161}, {'end': 912.118, 'text': 'So hey, it works.', 'start': 910.957, 'duration': 1.161}, {'end': 918, 'text': "So why complain about it? Well, the reason why is it's possible to make it work that much better.", 'start': 912.198, 'duration': 5.802}, {'end': 921.521, 'text': "It's really the difference between being a great programmer and an okay programmer.", 'start': 918.02, 'duration': 3.501}, {'end': 929.631, 'text': "And how we're going to make this work beautifully is we're going to create ourselves a new interface, and it's going to be called song iterator.java.", 'start': 921.841, 'duration': 7.79}, {'end': 933.976, 'text': 'This is going to allow me to refer to everything as a song iterator.', 'start': 929.871, 'duration': 4.105}], 'summary': 'Introducing a new interface, song iterator.java, to enhance programming efficiency.', 'duration': 27.5, 'max_score': 906.476, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag906476.jpg'}], 'start': 592.948, 'title': 'Java song info tutorial', 'summary': 'Involves creating an array list of 70s songs and using a for loop to print each song, introducing a tutorial on java programming for song information retrieval, covering the implementation of array lists, arrays, and hash tables to retrieve song details for the 70s, 80s, and 90s, and demonstrating the functionality through a radio station program.', 'chapters': [{'end': 634.274, 'start': 592.948, 'title': 'Al 70s songs array list', 'summary': 'Involves creating an array list of 70s songs and then using a for loop to iterate through the list to print each song, with specific details provided about the array list and the for loop.', 'duration': 41.326, 'highlights': ['Creating an array list of 70s songs using AL 70s songs and calling get best songs, then printing the list using a for loop to iterate through the array list and printing each song with specific details provided.', 'Using a for loop to iterate through the array list that was created with specific details provided about the length of the array list and the iteration process.']}, {'end': 921.521, 'start': 634.534, 'title': 'Java song info tutorial', 'summary': 'Introduces a tutorial on java programming for song information retrieval, covering the implementation of array lists, arrays, and hash tables to retrieve song details for the 70s, 80s, and 90s, demonstrating the functionality through a radio station program.', 'duration': 286.987, 'highlights': ['The tutorial covers the implementation of array lists, arrays, and hash tables to retrieve song details for the 70s, 80s, and 90s. The tutorial demonstrates the use of different data structures such as array lists, arrays, and hash tables to store and retrieve song details for different decades, namely the 70s, 80s, and 90s.', 'Demonstration of using a radio station program to showcase the functionality of retrieving and playing songs from different decades. The tutorial showcases the functionality of retrieving and playing songs from different decades by using a radio station program, demonstrating the practical application of the implemented data structures and retrieval methods.', 'Emphasis on the difference between being a great programmer and an okay programmer through efficient program implementation. The tutorial emphasizes the importance of efficient program implementation, highlighting the difference between being a great programmer and an okay programmer in terms of creating code that works well and can be further optimized.']}], 'duration': 328.573, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag592948.jpg', 'highlights': ['Demonstration of using a radio station program to showcase the functionality of retrieving and playing songs from different decades.', 'The tutorial covers the implementation of array lists, arrays, and hash tables to retrieve song details for the 70s, 80s, and 90s.', 'Creating an array list of 70s songs using AL 70s songs and calling get best songs, then printing the list using a for loop to iterate through the array list and printing each song with specific details provided.', 'Emphasis on the difference between being a great programmer and an okay programmer through efficient program implementation.']}, {'end': 1366.167, 'segs': [{'end': 987.174, 'src': 'heatmap', 'start': 921.841, 'weight': 2, 'content': [{'end': 929.631, 'text': "And how we're going to make this work beautifully is we're going to create ourselves a new interface, and it's going to be called song iterator.java.", 'start': 921.841, 'duration': 7.79}, {'end': 933.976, 'text': 'This is going to allow me to refer to everything as a song iterator.', 'start': 929.871, 'duration': 4.105}, {'end': 939.223, 'text': 'Every single one of these previous classes that we created will now be referred to as one.', 'start': 934.257, 'duration': 4.966}, {'end': 944.527, 'text': 'So the first thing we need to do, of course, is import our Java iterator library.', 'start': 939.403, 'duration': 5.124}, {'end': 949.332, 'text': "And then we're going to go public interface song iterator.", 'start': 944.728, 'duration': 4.604}, {'end': 951.774, 'text': "And then we're going to go public iterator.", 'start': 949.572, 'duration': 2.202}, {'end': 954.216, 'text': 'This is going to be the class that has to be created.', 'start': 951.994, 'duration': 2.222}, {'end': 956.858, 'text': "And it's going to be called create iterator.", 'start': 954.656, 'duration': 2.202}, {'end': 961.102, 'text': "Not much work to put into creating something that's going to make everything really, really cool.", 'start': 957.018, 'duration': 4.084}, {'end': 962.443, 'text': "So let's file save that.", 'start': 961.302, 'duration': 1.141}, {'end': 966.066, 'text': "And then to make all this work, we're going to jump into songs of the 70s.java.", 'start': 962.683, 'duration': 3.383}, {'end': 972.349, 'text': 'And we just need to go implements, song, iterator, right like that.', 'start': 967.287, 'duration': 5.062}, {'end': 974.61, 'text': "And then it's going to give us an error message.", 'start': 972.569, 'duration': 2.041}, {'end': 978.851, 'text': 'Songs of the 70s is going to say, hey, you need to bring in some unimplemented methods.', 'start': 974.67, 'duration': 4.181}, {'end': 979.991, 'text': 'And we shall.', 'start': 979.251, 'duration': 0.74}, {'end': 980.852, 'text': 'Click on that.', 'start': 980.212, 'duration': 0.64}, {'end': 982.732, 'text': 'Then we need to scroll down right here.', 'start': 981.012, 'duration': 1.72}, {'end': 987.174, 'text': "And we need to just pop out an iterator that's going to make it easier to use this guy.", 'start': 982.973, 'duration': 4.201}], 'summary': 'Creating a new interface song iterator.java to refer to classes as one, implementing methods to make everything work smoothly.', 'duration': 60.891, 'max_score': 921.841, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag921841.jpg'}, {'end': 1281.536, 'src': 'embed', 'start': 1256.428, 'weight': 0, 'content': [{'end': 1263.371, 'text': "we're going to go public void, print the songs and it's going to get an iterator sent to it iterator like that.", 'start': 1256.428, 'duration': 6.943}, {'end': 1265.311, 'text': "and then we're going to go while see.", 'start': 1263.371, 'duration': 1.94}, {'end': 1270.593, 'text': "we're going to be able to treat every one of these, even though they're different collection types, as if they're one.", 'start': 1265.311, 'duration': 5.282}, {'end': 1277.054, 'text': "so as long as we have more elements in our iterator, we're going to print out information.", 'start': 1270.593, 'duration': 6.461}, {'end': 1277.934, 'text': 'so look at this.', 'start': 1277.054, 'duration': 0.88}, {'end': 1281.536, 'text': 'i can just copy this copy Now instead of doing that three times.', 'start': 1277.934, 'duration': 3.602}], 'summary': 'Demonstrating iterating through different collection types and printing information.', 'duration': 25.108, 'max_score': 1256.428, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag1256428.jpg'}], 'start': 921.841, 'title': 'Implementing iterator design pattern', 'summary': 'Discusses the implementation of the iterator design pattern in java, including modifying code to utilize iterators instead of array lists or hash tables and exemplifying the ability to treat different collection types as one, aiming to create a public iterator class and resolving error messages by implementing unimplemented methods.', 'chapters': [{'end': 982.732, 'start': 921.841, 'title': 'Implementing song iterator interface', 'summary': "Discusses the implementation of a new interface 'song iterator.java' and the integration of previous classes as one, aiming to create a public iterator class 'create iterator' and resolve the error message by implementing unimplemented methods in 'songs of the 70s.java'.", 'duration': 60.891, 'highlights': ['Creating a new interface called song iterator.java to refer to all previous classes as one', 'Integrating previous classes into a public iterator class called create iterator', "Implementing the unimplemented methods in 'songs of the 70s.java' to resolve error messages"]}, {'end': 1366.167, 'start': 982.973, 'title': 'Implementing iterator design pattern', 'summary': 'Discusses the implementation of the iterator design pattern in java, including modifying code to utilize iterators instead of array lists or hash tables, exemplifying the ability to treat different collection types as one, and demonstrating the versatility and ease of use of the iterator design pattern while printing out songs.', 'duration': 383.194, 'highlights': ['Code modification to implement a song iterator interface in Java, enabling the utilization of iterators instead of array lists or hash tables, showcasing the minimal changes required for implementation.', 'Demonstration of treating different collection types as one through the use of iterators, exemplifying the versatility and ease of use of the iterator design pattern.', 'Utilizing the iterator design pattern to efficiently print out songs from different collections, showcasing the practical application and ease of use of the iterator design pattern.']}], 'duration': 444.326, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VKIzUuMdmag/pics/VKIzUuMdmag921841.jpg', 'highlights': ['Demonstration of treating different collection types as one through the use of iterators, exemplifying the versatility and ease of use of the iterator design pattern.', 'Utilizing the iterator design pattern to efficiently print out songs from different collections, showcasing the practical application and ease of use of the iterator design pattern.', 'Code modification to implement a song iterator interface in Java, enabling the utilization of iterators instead of array lists or hash tables, showcasing the minimal changes required for implementation.', 'Creating a new interface called song iterator.java to refer to all previous classes as one', 'Integrating previous classes into a public iterator class called create iterator', "Implementing the unimplemented methods in 'songs of the 70s.java' to resolve error messages"]}], 'highlights': ['The iterator design pattern provides a uniform way to access different types of collections of objects.', 'It enables the writing of polymorphic code and implementation of the same interface for cycling through various collections.', 'The requirement for collecting song information from top 70s, 80s, and 90s disc jockeys in an object-based format with specific fields like song name, band name, and release year.', 'The varied data structures used by different DJs, such as an array list, an array of objects, and a hash table, leading to potential data format inconsistencies.', 'The chapter emphasizes creating a Song Info class in Java, utilizing array lists and the iterator design pattern to organize and manipulate song information.', 'The chapter discusses the implementation of a disc jockey class to handle songs of the 70s, 80s, and 90s.', 'Demonstration of using a radio station program to showcase the functionality of retrieving and playing songs from different decades.', 'Demonstration of treating different collection types as one through the use of iterators, exemplifying the versatility and ease of use of the iterator design pattern.']}