Java Programming Tutorials

Java programming tutorials with many code examples!

Java 8 Comparators with Method References

Java 8 Comparators with Method References in action. We mix Java 8 static and default methods with method references to sort objects by multiple fields using chained Comparators!

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Java regex remove duplicated words

Regular Expressions are very handy for text processing. In this article we’ll show Java Regex to remove duplicated words, which is a common task.

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Java regex matching IP Address

A pretty cool exercise in writing Java Regular Expressions is to write Java regex matching IP Address. In this post we’ll show IP regexp and use in IP Address validator.

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Bean Validation Constraints

javax.validation defines a number of Bean Validation Constraints for values of most commonly used types. In this post we’ll show how to use each of them!

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Bean Validation Unit Testing

In this article we present practical Bean Validation Unit Testing using JUnit. Testing this part is very simple, yet often neglected by many developers. Let’s fix that!

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Java Bean Validation example

In this post we show Java Bean Validation example! Bean Validation is fantastic and flexible library that can be used in JEE and JSE programs to verify data!

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java.lang.InterruptedException

java.lang.InterruptedException is thrown when a Thread blocked in Object.wait(), Thread.join(), or Thread.sleep() is interrupted. Here we’ll look at these cases.

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Java IllegalMonitorStateException

java.lang.IllegalMonitorStateException form Object’s notify/wait methods indicates basic synchronization issue. In this post we’ll show the reason and how to fix it!

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