How to call super class method from sub class overriding method?

Yes, you can call the super class method from subclass overriding method using super keyword.

 

Syntax

super.methodName(arguments); 

 

MethodOverridingDemo1.java

package com.sample.app;

public class MethodOverridingDemo1 {
	
	public static class A{
		public void welcomeUser() {
			System.out.println("Hiiii!!!!!");
		}
	}
	
	public static class B extends A{
		@Override
		public void welcomeUser() {
			super.welcomeUser();
			System.out.println("Hello...........");
		}
	}
	
	public static void main(String[] args) {
		B b = new B();
		b.welcomeUser();
	}

}

 

Output

Hiiii!!!!!
Hello...........

 

Unlink constructor, super class method call doesn’t need to be first statement in the overriding method.

public static class B extends A {
	@Override
	public void welcomeUser() {
		System.out.println("Hello...........");
		super.welcomeUser();

	}
}

 

MethodOverridingDemo2.java

package com.sample.app;

public class MethodOverridingDemo2 {

	public static class A {
		public void welcomeUser() {
			System.out.println("Hiiii!!!!!");
		}
	}

	public static class B extends A {
		@Override
		public void welcomeUser() {
			System.out.println("Hello...........");
			super.welcomeUser();

		}
	}

	public static void main(String[] args) {
		B b = new B();
		b.welcomeUser();
	}

}

 

Output

Hello...........
Hiiii!!!!!

 

You can call super class method any number of times from the sub class method.

 

MethodOverridingDemo3.java

package com.sample.app;

public class MethodOverridingDemo3 {

	public static class A {
		public void welcomeUser() {
			System.out.println("Hiiii!!!!!");
		}
	}

	public static class B extends A {
		@Override
		public void welcomeUser() {
			super.welcomeUser();
			System.out.println("Hello...........");
			super.welcomeUser();
			super.welcomeUser();
			super.welcomeUser();

		}
	}

	public static void main(String[] args) {
		B b = new B();
		b.welcomeUser();
	}

}

 

Output

Hiiii!!!!!
Hello...........
Hiiii!!!!!
Hiiii!!!!!
Hiiii!!!!!

 

You can call any non-private method of super class from the subclass.

 

public static class B extends A {
	public void demo() {
		welcomeUser();
		welcomeUser();
	}
}

SuperclassMethodCallDemo.java

package com.sample.app;

public class SuperclassMethodCallDemo {
	public static class A {
		public void welcomeUser() {
			System.out.println("Hiiii!!!!!");
		}
	}

	public static class B extends A {
		public void demo() {
			welcomeUser();
			welcomeUser();
		}
	}
	
	public static void main(String[] args) {
		new B().demo();
	}
}

Output

Hiiii!!!!!
Hiiii!!!!!

Is it mandatory to call super class method from overriding method?

No, it is optional.

 

MethodOverridingDemo4.java

package com.sample.app;

public class MethodOverridingDemo4 {
	public static class A {
		public void welcomeUser() {
			System.out.println("Hiiii!!!!!");
		}
	}

	public static class B extends A {
		@Override
		public void welcomeUser() {
			System.out.println("Hello...........");
		}
	}

	public static void main(String[] args) {
		new B().welcomeUser();
	}
}

Output

Hello...........

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