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Constructor Chaining In Java programming
Constructor chaining refers to calling a constructor from other constructor. It is of two types.
Within same Class − Use this() keyword to refer to current class constructor. Make sure that this() is the first statement of the constructor and there should be at least one constructor without using this() statement.
From super/base Class − Use super() keyword to refer to parent class constructor. Make sure that super() is the first statement of the constructor.
Example
class A {
public int a;
public A() {
this(-1);
}
public A(int a) {
this.a = a;
}
public String toString() {
return "[ a= " + this.a + "]";
}
}
class B extends A {
public int b;
public B() {
this(-1,-1);
}
public B(int a, int b) {
super(a);
this.b = b;
}
public String toString() {
return "[ a= " + this.a + ", b = " + b + "]";
}
}
public class Tester {
public static void main(String args[]) {
A a = new A(10);
System.out.println(a);
B b = new B(11,12);
System.out.println(b);
A a1 = new A();
System.out.println(a1);
B b1 = new B();
System.out.println(b1);
}
}Output
[ a= 10] [ a= 11, b = 12] [ a= -1] [ a= -1, b = -1]
Updated on 25-Jun-2020 14:09:25
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