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Java Constructor Chaining Examples

Calling another constructor in the same class from another constructor is called constructor chaining. By using this() we can call another constructor in the same class. Incase we want to call another constructor, this() should be the first line in the constructor. Below example shows code for constructor chaining.

Java Constructor Chaining Sample Code

package com.myjava.constructors;

public class MyChaining {
    public MyChaining(){
        System.out.println("In default constructor...");
    public MyChaining(int i){
        System.out.println("In single parameter constructor...");
    public MyChaining(int i,int j){
        System.out.println("In double parameter constructor...");
    public static void main(String a[]){
        MyChaining ch = new MyChaining(10,20);

Example Output

In default constructor...
In single parameter constructor...
In double parameter constructor...

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What is fail-fast in java?
A fail-fast system is nothing but immediately report any failure that is likely to lead to failure. When a problem occurs, a fail-fast system fails immediately. In Java, we can find this behavior with iterators. Incase, you have called iterator on a collection object, and another thread tries to modify the collection object, then concurrent modification exception will be thrown. This is called fail-fast.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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