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Constructor chaining with this keyword

Answer»

Constructor chaining in JAVA is the process of calling one constructor with the help of another while considering the current object.

It can be done in 2 ways –

  • Within same class: It can be done using this() keyword for constructors in the same class.
  • From base class: By using super() keyword to call a constructor from the base class.

Here we will take a look at how constructor chaining is done with this keyword

public class Example { Example() {   this(10);  System.out.println("Default constructor"); } Example(int x) {  this(7, 9);  System.out.println("Parameterized Constructor having parameter :"+x); } Example(int a, int b) {     this(10,3,4);  System.out.println("Parameterized Constructor having parameters :"+a+","+b); } Example(int a, int b, int c) {  System.out.println("Parameterized Constructor having parameters :"+a+","+b+","+c); } public STATIC void MAIN(String args[]) {  NEW Example(); } }

The output is as follows:

$javac Example.java $java Example Parameterized Constructor having parameters :10,3,4 Parameterized Constructor having parameters :7,9 Parameterized Constructor having parameter :10 Default constructor


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