JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Example for static block vs constructor.


Description:

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.


Code:
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();
	}
}

Output:
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
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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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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