title
Singleton Design Pattern Tutorial

description
Get the Code: http://goo.gl/0yVzM Best Design Patterns Book : http://goo.gl/W0wyie Welcome to my Singleton Design Pattern Tutorial. The Singleton pattern is both easy to understand as well as useful. I'll demonstrate first how to implement the Singleton pattern. Then I'll provide and example of its usefulness with a Scrabble example. Threads can sometimes play havoc with this pattern, so I'll show you how to avoid those problems. I'll also review how to use threads, LinkedLists and more.

detail
{'title': 'Singleton Design Pattern Tutorial', 'heatmap': [{'end': 1092.149, 'start': 1040.089, 'weight': 0.898}], 'summary': 'This tutorial video covers the singleton design pattern in java, demonstrating its use for restricting class instantiation to a single object. it also includes implementing scrabble game methods and addressing multi-threading issues, providing a comprehensive understanding of the singleton pattern and its practical applications.', 'chapters': [{'end': 363.399, 'segs': [{'end': 45.899, 'src': 'embed', 'start': 14.536, 'weight': 0, 'content': [{'end': 19.139, 'text': 'However, if you need to brush up on basic OOP concepts or look at the other design patterns in this tutorial,', 'start': 14.536, 'duration': 4.603}, {'end': 21.3, 'text': 'I provide a link to the first part of this above.', 'start': 19.139, 'duration': 2.161}, {'end': 28.185, 'text': 'So what is a singleton pattern? It is used when you want to eliminate the option of instantiating more than one object.', 'start': 21.9, 'duration': 6.285}, {'end': 33.849, 'text': "You're going to create a class and it is only ever going to be able to create one object from that class.", 'start': 28.365, 'duration': 5.484}, {'end': 39.213, 'text': 'Now you might ask yourself, well when would I actually want to use something like that? Actually a lot of times.', 'start': 34.049, 'duration': 5.164}, {'end': 45.899, 'text': "In this part of the tutorial I'm going to demonstrate using a class that's going to hold all of the potential Scrabble letters.", 'start': 39.514, 'duration': 6.385}], 'summary': 'Singleton pattern ensures only one object is created, useful for managing scrabble letters.', 'duration': 31.363, 'max_score': 14.536, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs14536.jpg'}, {'end': 309.467, 'src': 'embed', 'start': 278.856, 'weight': 2, 'content': [{'end': 280.657, 'text': "And I'm going to call them letter list.", 'start': 278.856, 'duration': 1.801}, {'end': 283.258, 'text': 'And this is going to be equal to new linked list.', 'start': 280.857, 'duration': 2.401}, {'end': 284.119, 'text': 'Again, strings.', 'start': 283.658, 'duration': 0.461}, {'end': 289.171, 'text': "And then I'm going to take all of the letters in this array that we have right here.", 'start': 284.807, 'duration': 4.364}, {'end': 291.272, 'text': "And I'm going to throw them into the linked list.", 'start': 289.311, 'duration': 1.961}, {'end': 292.693, 'text': "So we're going to go arrays.", 'start': 291.592, 'duration': 1.101}, {'end': 295.516, 'text': 'If you wondered how to do that, you just go as list.', 'start': 292.713, 'duration': 2.803}, {'end': 298.298, 'text': "And inside of that, you're going to type in Scrabble letters.", 'start': 295.776, 'duration': 2.522}, {'end': 300.94, 'text': 'So that is a question that I recently received.', 'start': 298.558, 'duration': 2.382}, {'end': 305.324, 'text': 'How to get an array of things inside of a linked list.', 'start': 301.3, 'duration': 4.024}, {'end': 306.244, 'text': 'And now you know.', 'start': 305.584, 'duration': 0.66}, {'end': 309.467, 'text': 'And all the code is available underneath this video if you want to go get it.', 'start': 306.444, 'duration': 3.023}], 'summary': 'Creating a new linked list to store letters from an array, demonstrating how to get an array of things inside a linked list.', 'duration': 30.611, 'max_score': 278.856, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs278856.jpg'}], 'start': 0.149, 'title': 'Singleton pattern', 'summary': 'Covers the singleton pattern in design patterns tutorial, emphasizing its use to restrict the instantiation of more than one object from a class. it also demonstrates the implementation of the singleton pattern in java to ensure a single instance of a class is created, and incorporates the use of arrays, collections, and linked lists for managing potential scrabble letters, while addressing potential issues with multi-threading.', 'chapters': [{'end': 33.849, 'start': 0.149, 'title': 'Singleton pattern tutorial', 'summary': 'Covers the singleton pattern in design patterns tutorial, emphasizing its use to restrict the instantiation of more than one object from a class.', 'duration': 33.7, 'highlights': ['The singleton pattern restricts the instantiation of more than one object from a class.', 'It is a self-contained tutorial focusing on the singleton pattern within a larger design patterns tutorial.', 'The tutorial provides a link to the first part for those needing to brush up on basic OOP concepts or explore other design patterns.']}, {'end': 363.399, 'start': 34.049, 'title': 'Implementing singleton pattern for scrabble game', 'summary': 'Demonstrates the implementation of the singleton pattern in java to ensure a single instance of a class is created, and also incorporates the use of arrays, collections, and linked lists for managing potential scrabble letters, while addressing potential issues with multi-threading.', 'duration': 329.35, 'highlights': ['The chapter demonstrates the implementation of the Singleton pattern in Java to ensure a single instance of a class is created The Singleton pattern is used to ensure that only one instance of a class is created, which is useful for managing shared resources and preventing multiple instances from being created.', 'Incorporates the use of arrays, collections, and linked lists for managing potential Scrabble letters The tutorial demonstrates the use of arrays, collections, and linked lists to manage potential Scrabble letters, providing practical insights and examples for handling data structures in Java.', 'Addresses potential issues with multi-threading The chapter addresses potential issues with multi-threading by demonstrating techniques to manage threads and prevent the creation of multiple objects, showcasing practical solutions for handling concurrency in Java programming.']}], 'duration': 363.25, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs149.jpg', 'highlights': ['The tutorial provides a link to the first part for those needing to brush up on basic OOP concepts or explore other design patterns.', 'The chapter demonstrates the implementation of the Singleton pattern in Java to ensure a single instance of a class is created The Singleton pattern is used to ensure that only one instance of a class is created, which is useful for managing shared resources and preventing multiple instances from being created.', 'Incorporates the use of arrays, collections, and linked lists for managing potential Scrabble letters The tutorial demonstrates the use of arrays, collections, and linked lists to manage potential Scrabble letters, providing practical insights and examples for handling data structures in Java.']}, {'end': 739.12, 'segs': [{'end': 389.351, 'src': 'embed', 'start': 363.619, 'weight': 1, 'content': [{'end': 372.643, 'text': "However, I'm going to come in and create a whole bunch of other different methods inside of here that are going to work with these threads to create our little Scrabble game that we are going to be creating here.", 'start': 363.619, 'duration': 9.024}, {'end': 373.903, 'text': "So I'm going to go public.", 'start': 372.823, 'duration': 1.08}, {'end': 377.385, 'text': 'And what this method is going to do is return a list of all the available letters.', 'start': 374.043, 'duration': 3.342}, {'end': 380.146, 'text': 'So I have all those letters in a linked list.', 'start': 377.665, 'duration': 2.481}, {'end': 381.446, 'text': 'And they are all strings.', 'start': 380.426, 'duration': 1.02}, {'end': 383.387, 'text': "So I'm going to call this guy get letter.", 'start': 381.466, 'duration': 1.921}, {'end': 389.351, 'text': "list And what's it going to do? This is how you would return fields inside of a singleton.", 'start': 383.727, 'duration': 5.624}], 'summary': 'Creating a scrabble game with a method to return a list of available letters.', 'duration': 25.732, 'max_score': 363.619, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs363619.jpg'}, {'end': 423.686, 'src': 'embed', 'start': 399.217, 'weight': 0, 'content': [{'end': 405.782, 'text': "So it's going to return a string linked list and it's going to be called get tiles and it's going to receive an integer.", 'start': 399.217, 'duration': 6.565}, {'end': 407.923, 'text': "It's going to say how many tiles do you want.", 'start': 406.022, 'duration': 1.901}, {'end': 414.657, 'text': "And then I'm going to create another linked list, tiles to send, and be equal to new linked list.", 'start': 408.211, 'duration': 6.446}, {'end': 417.98, 'text': 'And if you want to really, really understand this, you definitely should get the code.', 'start': 415.078, 'duration': 2.902}, {'end': 423.686, 'text': 'Almost every single time I get an error from one of you guys or not understanding why something is done.', 'start': 418.201, 'duration': 5.485}], 'summary': 'Function gettiles returns a string linked list based on input integer.', 'duration': 24.469, 'max_score': 399.217, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs399217.jpg'}, {'end': 485.824, 'src': 'embed', 'start': 456.038, 'weight': 5, 'content': [{'end': 458.981, 'text': 'So if they say hey, I want seven tiles to start this gravel game,', 'start': 456.038, 'duration': 2.943}, {'end': 464.367, 'text': "it's going to kick back seven letters and then chop those seven letters off of the linked list so that nobody else gets them.", 'start': 458.981, 'duration': 5.386}, {'end': 469.232, 'text': "How do we get those guys? We're going to go first instance, letter list, and we're going to go remove.", 'start': 464.487, 'duration': 4.745}, {'end': 471.934, 'text': "And you would have thought I'd put an I in there, but no, I'm going to put a zero.", 'start': 469.252, 'duration': 2.682}, {'end': 479.6, 'text': 'And the reason why is whenever you call remove, it is going to chop off the zero index and then move everything from the right over to the left.', 'start': 472.034, 'duration': 7.566}, {'end': 485.824, 'text': "So next time through, what is in the one index will now be in the zero again, and everything's just going to work out perfect.", 'start': 479.78, 'duration': 6.044}], 'summary': 'The process removes letters from a linked list based on user input, using index and remove function.', 'duration': 29.786, 'max_score': 456.038, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs456038.jpg'}, {'end': 622.301, 'src': 'embed', 'start': 595.939, 'weight': 4, 'content': [{'end': 600.844, 'text': "And then let's say we want to print out to screen all the new tiles that Player 1 just received.", 'start': 595.939, 'duration': 4.905}, {'end': 601.585, 'text': "That's useful.", 'start': 601.004, 'duration': 0.581}, {'end': 604.908, 'text': "So we're going to go Player 1 and then Player 1 Tiles.", 'start': 601.985, 'duration': 2.923}, {'end': 607.731, 'text': "And that's going to print out all the tiles for Player 1 in our Scrabble game.", 'start': 604.948, 'duration': 2.783}, {'end': 614.297, 'text': "And maybe we also want to print out our letter list just to see how it's changed since Player 1 went in there and created that guy.", 'start': 608.151, 'duration': 6.146}, {'end': 617.839, 'text': "And then what we're going to do is go singleton again.", 'start': 614.637, 'duration': 3.202}, {'end': 620.44, 'text': "We're going to try to create a new instance.", 'start': 617.859, 'duration': 2.581}, {'end': 622.301, 'text': 'This is going to be our second player.', 'start': 620.48, 'duration': 1.821}], 'summary': 'Printing new tiles for player 1 and creating a new instance for the second player in our scrabble game.', 'duration': 26.362, 'max_score': 595.939, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs595939.jpg'}, {'end': 695.858, 'src': 'embed', 'start': 668.692, 'weight': 2, 'content': [{'end': 671.854, 'text': "And there are all the letters printed out, but that's kind of messy.", 'start': 668.692, 'duration': 3.162}, {'end': 675.417, 'text': "What I want to show you here is instead of that, I'm going to go over into Singleton.", 'start': 671.974, 'duration': 3.443}, {'end': 678.839, 'text': "I'm going to scramble these letters out so that they're not printed out all in order.", 'start': 675.437, 'duration': 3.402}, {'end': 680.481, 'text': "because I think that's a little bit more impressive.", 'start': 679.059, 'duration': 1.422}, {'end': 683.324, 'text': "so I'm going to jump back into singleton.java.", 'start': 680.481, 'duration': 2.843}, {'end': 688.129, 'text': 'and right here, where we get to first instance, where we created our first object,', 'start': 683.324, 'duration': 4.805}, {'end': 695.858, 'text': "I'm going to call collections and I'm going to shuffle first instance, which is this guy right here, so that all the letters are not in order,", 'start': 688.129, 'duration': 7.729}], 'summary': 'Using singleton to scramble letters for a more impressive display.', 'duration': 27.166, 'max_score': 668.692, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs668692.jpg'}], 'start': 363.619, 'title': 'Creating scrabble game methods and implementing scrabble test in java', 'summary': 'Covers creating methods for player tile management and implementing a scrabble game in java using the singleton pattern, including shuffling letter lists and printing unique ids. it also discusses managing the distribution of tiles using a linked list.', 'chapters': [{'end': 490.647, 'start': 363.619, 'title': 'Creating scrabble game methods', 'summary': 'Covers creating methods to return available letters and tiles for players in a scrabble game, including manipulating a linked list to manage the distribution of tiles.', 'duration': 127.028, 'highlights': ["The method 'getLetterList' returns a list of all available letters, stored in a linked list, for the Scrabble game. The 'getLetterList' method returns a list of all available letters for the Scrabble game, stored in a linked list.", "The method 'getTiles' returns a specified number of tiles for a player and manipulates the linked list to remove the distributed tiles. The 'getTiles' method returns a specified number of tiles for a player and manipulates the linked list to remove the distributed tiles, ensuring they are not available to other players.", "Explanation of using 'remove' method to manipulate the linked list and distribute tiles to players in the Scrabble game. Detailed explanation of using the 'remove' method to manipulate the linked list and distribute tiles to players in the Scrabble game, ensuring fair distribution and preventing duplicate tiles."]}, {'end': 739.12, 'start': 491.568, 'title': 'Scrabble test in java', 'summary': 'Discusses implementing a scrabble game in java using the singleton pattern, creating and shuffling letter lists, and printing out unique ids and player tiles.', 'duration': 247.552, 'highlights': ['Implementing a Scrabble game in Java using the singleton pattern The chapter demonstrates the implementation of a Scrabble game in Java using the singleton pattern to create unique instances and manage objects.', 'Creating and shuffling letter lists The chapter explains the creation of letter lists and demonstrates shuffling the letters to randomize their order for the Scrabble game.', 'Printing out unique IDs and player tiles The chapter covers the printing of unique IDs for instances created using the singleton pattern and the printing of player tiles for the Scrabble game.']}], 'duration': 375.501, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs363619.jpg', 'highlights': ["The method 'getTiles' returns a specified number of tiles for a player and manipulates the linked list to remove the distributed tiles, ensuring they are not available to other players.", "The method 'getLetterList' returns a list of all available letters for the Scrabble game, stored in a linked list.", 'Implementing a Scrabble game in Java using the singleton pattern to create unique instances and manage objects.', 'Creating and shuffling letter lists for the Scrabble game.', 'Printing out unique IDs for instances created using the singleton pattern and the printing of player tiles for the Scrabble game.', "Explanation of using 'remove' method to manipulate the linked list and distribute tiles to players in the Scrabble game, ensuring fair distribution and preventing duplicate tiles."]}, {'end': 1118.885, 'segs': [{'end': 790.512, 'src': 'embed', 'start': 759.39, 'weight': 2, 'content': [{'end': 760.471, 'text': 'And public static.', 'start': 759.39, 'duration': 1.081}, {'end': 765.233, 'text': 'What is this telling you? This is telling you that this is going to be a main execution area.', 'start': 760.711, 'duration': 4.522}, {'end': 767.634, 'text': "Why? Because I'm using public static void main.", 'start': 765.473, 'duration': 2.161}, {'end': 770.415, 'text': "So the first thing I'm going to do is go in here and go runnable.", 'start': 767.914, 'duration': 2.501}, {'end': 776.7, 'text': 'create a new thread using the runnable interface and this is going to execute my code.', 'start': 770.975, 'duration': 5.725}, {'end': 782.305, 'text': 'for me, meaning the code for creating new instances of the singleton class.', 'start': 776.7, 'duration': 5.605}, {'end': 790.512, 'text': "new and get the tiles is going to be the name of the class that's going to have the run method inside of it to use with this thread.", 'start': 782.305, 'duration': 8.207}], 'summary': 'Using public static void main for main execution area and creating new thread with the runnable interface to execute code for creating new instances of the singleton class.', 'duration': 31.122, 'max_score': 759.39, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs759390.jpg'}, {'end': 859.848, 'src': 'embed', 'start': 835.751, 'weight': 0, 'content': [{'end': 851.656, 'text': "get the tiles implements runnable because we're using those threads and then we need to go public void run and then we're going to go singleton and this run method is going to execute all the code in here for both of my threads,", 'start': 835.751, 'duration': 15.905}, {'end': 852.996, 'text': 'if you forgot previously.', 'start': 851.656, 'duration': 1.34}, {'end': 859.848, 'text': "So I'm going to go create a singleton object called new instance And it's just going to be singleton get instance again.", 'start': 853.296, 'duration': 6.552}], 'summary': 'Implementing the runnable interface for using threads and executing code in the run method for a singleton object.', 'duration': 24.097, 'max_score': 835.751, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs835751.jpg'}, {'end': 978.433, 'src': 'embed', 'start': 953.174, 'weight': 1, 'content': [{'end': 958.139, 'text': 'Now we very well could come in here and change this to syncronized.', 'start': 953.174, 'duration': 4.965}, {'end': 963.423, 'text': "Now what this is basically going to do is it's going to force every thread to wait its turn.", 'start': 958.519, 'duration': 4.904}, {'end': 968.886, 'text': 'In essence that way only one thread is going to be able to access this method at a time.', 'start': 963.583, 'duration': 5.303}, {'end': 975.391, 'text': 'And until that thread releases, this method being the get instance method, which is going to create a new singleton object,', 'start': 969.087, 'duration': 6.304}, {'end': 978.433, 'text': 'no one else is going to be able to create a new singleton object.', 'start': 975.391, 'duration': 3.042}], 'summary': 'Using synchronized will force every thread to wait its turn, allowing only one thread at a time to access the method and create a new singleton object.', 'duration': 25.259, 'max_score': 953.174, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs953174.jpg'}, {'end': 1095.091, 'src': 'heatmap', 'start': 1033.805, 'weight': 4, 'content': [{'end': 1039.91, 'text': "So in this situation, I'm going to show you another way to get the same results without slowing your program down terribly.", 'start': 1033.805, 'duration': 6.105}, {'end': 1042.192, 'text': "And it's actually going to be pretty simple.", 'start': 1040.089, 'duration': 2.103}, {'end': 1045.875, 'text': "We're going to wrap everything inside of synchronized singleton.", 'start': 1042.392, 'duration': 3.483}, {'end': 1054.422, 'text': 'class And in essence, what this is going to do is this is going to force it to be a synchronized method until the first object is created.', 'start': 1046.255, 'duration': 8.167}, {'end': 1058.726, 'text': 'And then thereafter, it is no longer going to be considered a synchronized class.', 'start': 1054.682, 'duration': 4.044}, {'end': 1065.091, 'text': "And then after this, we're going to run our same if statement, we're going to cut that out of there, paste it in there.", 'start': 1059.046, 'duration': 6.045}, {'end': 1072.578, 'text': "And then we're going to check it for noll again, like I said, this is only ever going to happen up until the very first object is created.", 'start': 1065.352, 'duration': 7.226}, {'end': 1074.92, 'text': "And now we're going to go first instance.", 'start': 1072.938, 'duration': 1.982}, {'end': 1077.521, 'text': "And we're also going to shuffle our letters.", 'start': 1075.28, 'duration': 2.241}, {'end': 1079.382, 'text': "And then we're going to close off everything.", 'start': 1077.901, 'duration': 1.481}, {'end': 1082.764, 'text': "So now that we have that all set up, let's see if we fixed our problem.", 'start': 1079.622, 'duration': 3.142}, {'end': 1083.885, 'text': "So let's execute it again.", 'start': 1082.784, 'duration': 1.101}, {'end': 1085.165, 'text': 'And you can see there was a pause.', 'start': 1084.085, 'duration': 1.08}, {'end': 1086.126, 'text': 'And there you go.', 'start': 1085.506, 'duration': 0.62}, {'end': 1092.149, 'text': 'So now both of our objects are of exactly the same type, they both point to the same unique ID.', 'start': 1086.466, 'duration': 5.683}, {'end': 1095.091, 'text': 'And as well, our letters are going to be the same, they might look different.', 'start': 1092.39, 'duration': 2.701}], 'summary': 'Utilized synchronized singleton to optimize program performance and fix object creation issue.', 'duration': 61.286, 'max_score': 1033.805, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs1033805.jpg'}, {'end': 1104.477, 'src': 'embed', 'start': 1075.28, 'weight': 3, 'content': [{'end': 1077.521, 'text': "And we're also going to shuffle our letters.", 'start': 1075.28, 'duration': 2.241}, {'end': 1079.382, 'text': "And then we're going to close off everything.", 'start': 1077.901, 'duration': 1.481}, {'end': 1082.764, 'text': "So now that we have that all set up, let's see if we fixed our problem.", 'start': 1079.622, 'duration': 3.142}, {'end': 1083.885, 'text': "So let's execute it again.", 'start': 1082.784, 'duration': 1.101}, {'end': 1085.165, 'text': 'And you can see there was a pause.', 'start': 1084.085, 'duration': 1.08}, {'end': 1086.126, 'text': 'And there you go.', 'start': 1085.506, 'duration': 0.62}, {'end': 1092.149, 'text': 'So now both of our objects are of exactly the same type, they both point to the same unique ID.', 'start': 1086.466, 'duration': 5.683}, {'end': 1095.091, 'text': 'And as well, our letters are going to be the same, they might look different.', 'start': 1092.39, 'duration': 2.701}, {'end': 1099.194, 'text': 'The only reason why is all of these letters, the first seven of them have been replaced down there.', 'start': 1095.171, 'duration': 4.023}, {'end': 1101.635, 'text': 'And then those letters have been replaced down there.', 'start': 1099.494, 'duration': 2.141}, {'end': 1104.477, 'text': "So there's a whole bunch of things about the singleton method,", 'start': 1101.875, 'duration': 2.602}], 'summary': 'Troubleshooting code, fixing problem, ensuring objects and letters match.', 'duration': 29.197, 'max_score': 1075.28, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs1075280.jpg'}], 'start': 739.321, 'title': 'Implementing threads in java and fixing multi-threading issue with singleton method', 'summary': 'Discusses implementing threads in java to execute code concurrently, creating singleton objects, using the runnable interface, and executing threads to get tiles and play the game. it also details the issue with multiple thread instances in the singleton method, proposes a solution using synchronization, and demonstrates the successful resolution by ensuring the objects are of the same type and pointing to the same unique id.', 'chapters': [{'end': 916.244, 'start': 739.321, 'title': 'Implementing threads in java', 'summary': 'Discusses implementing threads in java to execute code concurrently, creating singleton objects, using the runnable interface, and executing threads to get tiles and play the game.', 'duration': 176.923, 'highlights': ['The chapter discusses implementing threads in Java to execute code concurrently, creating singleton objects, using the runnable interface, and executing threads to get tiles and play the game.', 'The code demonstrates the use of the runnable interface and creating a main execution area using public static void main.', 'The chapter explains how to create singleton objects using the get instance method and the run method to execute code for multiple threads.', 'The transcript details the process of using threads to get tiles and play the game, including creating a new class called Scrabble test threads, implementing the get tiles method, and executing threads to obtain tiles using concurrent programming.']}, {'end': 1118.885, 'start': 916.284, 'title': 'Fixing multi-threading issue with singleton method', 'summary': 'Details the issue with multiple thread instances in the singleton method, proposes a solution using synchronization, and demonstrates the successful resolution by ensuring the objects are of the same type and pointing to the same unique id.', 'duration': 202.601, 'highlights': ['The chapter details the issue with multiple thread instances in the Singleton method, highlighting the potential destruction of the Scrabble game due to the creation of multiple instances of different letters.', 'The solution is proposed by using synchronization to force every thread to wait its turn, allowing only one thread to access the method at a time and preventing the creation of multiple singleton objects.', 'The successful resolution is demonstrated by executing the fixed code, ensuring that both objects are of the same type and pointing to the same unique ID, and confirming that the letters are the same, thereby resolving the multi-threading issue.']}], 'duration': 379.564, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/NZaXM67fxbs/pics/NZaXM67fxbs739321.jpg', 'highlights': ['The chapter discusses implementing threads in Java to execute code concurrently, creating singleton objects, using the runnable interface, and executing threads to get tiles and play the game.', 'The solution is proposed by using synchronization to force every thread to wait its turn, allowing only one thread to access the method at a time and preventing the creation of multiple singleton objects.', 'The code demonstrates the use of the runnable interface and creating a main execution area using public static void main.', 'The successful resolution is demonstrated by executing the fixed code, ensuring that both objects are of the same type and pointing to the same unique ID, and confirming that the letters are the same, thereby resolving the multi-threading issue.', 'The chapter explains how to create singleton objects using the get instance method and the run method to execute code for multiple threads.']}], 'highlights': ['The tutorial provides a link to the first part for those needing to brush up on basic OOP concepts or explore other design patterns.', 'The chapter demonstrates the implementation of the Singleton pattern in Java to ensure a single instance of a class is created The Singleton pattern is used to ensure that only one instance of a class is created, which is useful for managing shared resources and preventing multiple instances from being created.', 'Incorporates the use of arrays, collections, and linked lists for managing potential Scrabble letters The tutorial demonstrates the use of arrays, collections, and linked lists to manage potential Scrabble letters, providing practical insights and examples for handling data structures in Java.', "The method 'getTiles' returns a specified number of tiles for a player and manipulates the linked list to remove the distributed tiles, ensuring they are not available to other players.", "The method 'getLetterList' returns a list of all available letters for the Scrabble game, stored in a linked list.", 'Implementing a Scrabble game in Java using the singleton pattern to create unique instances and manage objects.', 'Creating and shuffling letter lists for the Scrabble game.', 'Printing out unique IDs for instances created using the singleton pattern and the printing of player tiles for the Scrabble game.', "Explanation of using 'remove' method to manipulate the linked list and distribute tiles to players in the Scrabble game, ensuring fair distribution and preventing duplicate tiles.", 'The chapter discusses implementing threads in Java to execute code concurrently, creating singleton objects, using the runnable interface, and executing threads to get tiles and play the game.', 'The solution is proposed by using synchronization to force every thread to wait its turn, allowing only one thread to access the method at a time and preventing the creation of multiple singleton objects.', 'The code demonstrates the use of the runnable interface and creating a main execution area using public static void main.', 'The successful resolution is demonstrated by executing the fixed code, ensuring that both objects are of the same type and pointing to the same unique ID, and confirming that the letters are the same, thereby resolving the multi-threading issue.', 'The chapter explains how to create singleton objects using the get instance method and the run method to execute code for multiple threads.']}