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Role of super Keyword in Java Inheritance
Parent class objects can be referred to using the super keyword in Java. It is usually used in the context of inheritance. A program that demonstrates the super keyword in Java is given as follows:
Example
class A {
int a;
A(int x) {
a = x;
}
}
class B extends A {
int b;
B(int x, int y) {
super(x);
b = y;
}
void print() {
System.out.println("Value of a: " + a);
System.out.println("Value of b: " + b);
}
}
public class Demo {
public static void main(String args[]) {
B obj = new B(7, 3);
obj.print();
}
}Output
Value of a: 7 Value of b: 3
Now let us understand the above program.
The class A contains a data member a and constructor A(). The class B uses the extends keyword to derive from class A. It also contains a data member b and constructor B(). The method print() prints the values of a and b. A code snippet which demonstrates this is as follows:
class A {
int a;
A(int x) {
a = x;
}
}
class B extends A {
int b;
B(int x, int y) {
super(x);
b = y;
}
void print() {
System.out.println("Value of a: " + a);
System.out.println("Value of b: " + b);
}
}In the main() method in class Demo, an object obj of class B is created. Then the method print() is called. A code snippet which demonstrates this is as follows:
public class Demo {
public static void main(String args[]) {
B obj = new B(7, 3);
obj.print();
}
}
Updated on: 30-Jul-2019
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