Autoboxing and unboxing

Before Java 5, Wrapper classes like Integer, Float, Boolean, etc were ...

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Override equals and hashcode method

In Java if you want to check that two objects are meaningfully equal, then you need to ...

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Create an immutable class

An immmutable class is a class whose state can not be changed once its instance ...

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Checked and unchecked Exception

Checked Exceptions are Exceptions which must be caught in the code using catch ...

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Exception Handling in Java

Sometimes we want to process various kinds of Exceptions in the same way, ...

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Try with resources example

Java try-with-resources was introduced with Java 7. Using try-with-resources, you can get rid ...

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Measure elapsed time in Java

You can measure elapsed time or check time taken by method in Java by using System currentTimeMillis()...

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Java enum examples

Enums help in reducing defects by restricting the type of value a variable can...

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Write custom annotation

Annotations were introduced in Java 1.5 version. They are used to provide metadata for a field ...

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Iterate through a HashMap

There are various ways of iterating over a Map type in Java. We will use HashMap to show ...

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Remove an item from HashMap

There are various ways of removing an item from a Map type in Java. We will use HashMap to show various way...

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Remove an item from ArrayList

There are various ways of removing an item from a ArrayList type in Java as...

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How to sort an ArrayList

You can sort an ArrayList using Collections sort() by either implementating a Comparable...

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Convert Array to List

There are various ways of converting Array to List such using Arrays asList()...

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Acquire Lock in Java

When multiple threads access an object and try to read the object or modify its state...

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Thread synchronization in Java

You can achieve thread synchronization in Java using synchronized keyword...

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Executor and ExecutorService example

When you need more then one Thread to process multiple tasks in Java, you typically create...

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Java ThreadLocal example

ThreadLocal class contains threead-local variables that are associated with only one Thread...

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Java FutureTask example

Java Callable and FutureTask example...

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CountDownLatch example

A CountdownLatch allows one or more threads to wait for a set of events to occur...

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CyclicBarrier example

A CyclicBarrier allows one or more threads to wait so that they can reach a common point...

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Singleton Design Pattern

Singleton Design Pattern is a software design pattern that makes ...

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Builder Design Pattern

Builder Design Pattern is a creational design pattern which separates the construction...

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Prototype Design Pattern

Prototype Design Pattern is a creational design pattern and should be used ...

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Factory Design Pattern

Factory Design Pattern is a creational pattern that uses factory methods...

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Observer Design Pattern

Prototype Design Pattern is a creational design pattern and should be used ...

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