Java Programming/Keywords/super

super is a keyword.

It is used inside a sub-class method definition to call a method defined in the super class. Private methods of the super-class cannot be called. Only public and protected methods can be called by the super keyword.
It is also used by class constructors to invoke constructors of its parent class.
Super keyword are not used in static Method.

Syntax:

super .<method-name>([zero or more arguments]);

or:

super ([zero or more arguments]);

For example:

Computer code Code listing 1: SuperClass.java

publicclass SuperClass{
publicvoidprintHello(){
System.out.println("Hello from SuperClass");
return;
}
}

Computer code Code listing 2: SubClass.java

publicclass SubClassextendsSuperClass{
publicvoidprintHello(){
super.printHello();
System.out.println("Hello from SubClass");
return;
}
publicstaticmain(String[]args){
SubClassobj=newSubClass();
obj.printHello();
}
}

Running the above program:

Computer code Command for Code listing 2

$Java SubClass

Computer code Output of Code listing 2

Hello from SuperClass
Hello from SubClass

In Java 1.5 and later, the "super" keyword is also used to specify a lower bound on a wildcard type parameter in Generics.

Example Code section 1: A lower bound on a wildcard type parameter.

publicvoidsort(Comparator<?superT>comp){
...
}