java super.var
class Superclass
{
int num = 100;
}
class Subclass extends Superclass
{
int num = 110;
void printNumber(){
/* Note that instead of writing num we are
* writing super.num in the print statement
* this refers to the num variable of Superclass
*/
System.out.println(super.num);
}
public static void main(String args[]){
Subclass obj= new Subclass();
obj.printNumber();
}
}how to use super class method in java
class Parentclass
{
//no-arg constructor
Parentclass(){
System.out.println("no-arg constructor of parent class");
}
//arg or parameterized constructor
Parentclass(String str){
System.out.println("parameterized constructor of parent class");
}
}
class Subclass extends Parentclass
{
Subclass(){
/* super() must be added to the first statement of constructor
* otherwise you will get a compilation error. Another important
* point to note is that when we explicitly use super in constructor
* the compiler doesn't invoke the parent constructor automatically.
*/
super("Hahaha");
System.out.println("Constructor of child class");
}
void display(){
System.out.println("Hello");
}
public static void main(String args[]){
Subclass obj= new Subclass();
obj.display();
}
}Copyright © 2021 Codeinu
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