what is constructor chaining ?????

explain with example in detail how to solve it program plz send a program

Anirudha
16 May
4105 Views
8 Answers

Pritam
11 Apr

Constructor chaining is the process of calling one constructor from another constructor with respect to current object. // Java program to illustrate Constructor Chaining // within same class Using this() keyword class Temp { &nbsp;&nbsp;&nbsp;&nbsp;// default constructor 1 &nbsp;&nbsp;&nbsp;&nbsp;// default constructor will call another constructor &nbsp;&nbsp;&nbsp;&nbsp;// using this keyword from same class &nbsp;&nbsp;&nbsp;&nbsp;Temp() &nbsp;&nbsp;&nbsp;&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// calls constructor 2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this(5); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(&quot;The Default constructor&quot;); &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;// parameterized constructor 2 &nbsp;&nbsp;&nbsp;&nbsp;Temp(int x) &nbsp;&nbsp;&nbsp;&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// calls constructor 3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this(5, 15); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(x); &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;// parameterized constructor 3 &nbsp;&nbsp;&nbsp;&nbsp;Temp(int x, int y) &nbsp;&nbsp;&nbsp;&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(x * y); &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;public static void main(String args[]) &nbsp;&nbsp;&nbsp;&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// invokes default constructor first &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;new Temp(); &nbsp;&nbsp;&nbsp;&nbsp;} } Run on IDE Output: The Default constructor 5 75

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Constructor chaining is the process of calling one constructor from another constructor with respect to current object.
// Java program to illustrate Constructor Chaining
// within same class Using this() keyword
class Temp
{
    // default constructor 1
    // default constructor will call another constructor
    // using this keyword from same class
    Temp()
    {
        // calls constructor 2
        this(5);
        System.out.println("The Default constructor");
    }

    // parameterized constructor 2
    Temp(int x)
    {
        // calls constructor 3
        this(5, 15);
        System.out.println(x);
    }

    // parameterized constructor 3
    Temp(int x, int y)
    {
        System.out.println(x * y);
    }

    public static void main(String args[])
    {
        // invokes default constructor first
        new Temp();
    }
}
Run on IDE
Output:
The Default constructor 5 75

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