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