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Program: Example for static block vs constructor.


Java static blocks will be called when JVM loads the class into memory, means it will be called only once. But constructor will be called everytime when you create an object. The below example can give you an idea about execution.

package com.java2novice.staticexmp;

public class MyStaticVsConstructor {

	static {
		System.out.println("I am in static block");
		System.out.println("Static block will be called first than constructor!!!");
		System.out.println("Static block will be called only once.");
	public MyStaticVsConstructor(){
		System.out.println("I am in constructor");
	public static void main(String a[]){
		MyStaticVsConstructor ksv1 = new MyStaticVsConstructor();
		MyStaticVsConstructor ksv2 = new MyStaticVsConstructor();
		MyStaticVsConstructor ksv3 = new MyStaticVsConstructor();
		MyStaticVsConstructor ksv4 = new MyStaticVsConstructor();

I am in static block
Static block will be called first than constructor!!!
Static block will be called only once.
I am in constructor
I am in constructor
I am in constructor
I am in constructor
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List Of All Static Keyword Programs:

  1. Example for static variables and methods.
  2. Example for static block.
  3. Example for static block vs constructor.
  4. Example for singleton class using static block.
Knowledge Centre
What is race condition?
A race condition is a situation in which two or more threads or processes are reading or writing some shared data, and the final result depends on the timing of how the threads are scheduled. Race conditions can lead to unpredictable results and subtle program bugs. A thread can prevent this from happening by locking an object. When an object is locked by one thread and another thread tries to call a synchronized method on the same object, the second thread will block until the object is unlocked.
Famous Quotations
Insanity: doing the same thing over and over again and expecting different results.
-- Albert Einstein

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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