This resource offers a total of 630 Java Collection problems for practice. It includes 126 main exercises, each accompanied by solutions, detailed explanations, and four related problems. Java Collection refers to a framework provided by Java to store and manipulate groups of objects. It offers a ...
is one of the most important features introduced in Java 5. If you have been working onJava Collectionsand with version 5 or higher, I am sure that you have used it.Generics in Javawith collection classes is very easy but provides many more features than just creating the type of collectio...
Avoiding excessive use of null is a good practice. For example, it’s preferable to return empty arrays or collections from methods instead of nulls, since it can help prevent NullPointerException. Consider the following method that traverses a collection obtained from another method, as shown be...
You can apply this technique to your own problems and data models, too. You should see sensible speedups as long as you can rewrite your algorithms in a “divide and conquer” fashion that is free of I/O work and locking. Acknowledgements The author would like to thank Brian Goetz and Mi...
Collections.shuffle(words, randomizer); // prints the words above but with a 99.17% chance of a different order System.out.println(words); HttpClient.An HttpClient can now be instructed toclose, to shut down, or to await termination, but those are best-effort implementations that can have ad...
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What is the best way to access duplicate records when not using collections?Duplicate records are records that are in a single database and have the same key. Since there is more than one record per key, a simple lookup by key is not sufficient to find all duplicate records for that key...
Look at the System.Collections.Stack class supplied in Microsoft's .NET Framework, or Java's java.util.Stack class which is very similar. Both seem to be designed reasonably: avoid Push(Object)method, and anObject Pop()method. The latter function throws an Exception if it is called on an...
This book also consists of a plethora of practice problems. Plus, after each chapter, the author sums up the topic and adds many supplementary exercises and solutions. That can help readers focus more on the book and learn Java more efficiently. 14. Mastering Java Machine Learning Mastering Jav...
Source code of the java.util.Collections class 37 This program has two performance problems that limit perform- ance scalability on a multicore machine. 1. Lock contentions will occur frequently at the synchronized blocks in Lines 24 and 36 in Figure 1. 2. Lock contentions will occur ...