Method Overriding

Method overriding:

In a class hierarchy, when a method in a subclass has the same name and type signature as a method in its super class, then the method in the subclass is said to override the method in the super class. When an overridden method is called from within a subclass, it will always refer to the version of that method defined by the subclass. The version of the method defined by the super class will be hidden.

Consider the following: 

// Method overriding. 
class A { 
int i, j; 
A(int a, int b) { 
i = a; 
j = b; 
} 
// display i and j 
void show() { 
System.out.println("i and j: " + i + " " + j); 
} 
}

class B extends A { 
int k; 
B(int a, int b, int c) { 
super(a, b); 
k = c; 
} 
// display k – this overrides show() in A 
void show() { 
System.out.println("k: " + k); 
} 
}

class Override { 
public static void main(String args[]) { 
B subOb = new B(1, 2, 3); 
subOb.show(); // this calls show() in B 
} 
}// Output:3