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vijay
Inheritence
1 Answer(s)      6 years and 2 months ago
Posted in : Java Beginners



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November 7, 2008 at 1:03 PM


Hi friend,


There are two forms of inheritance in the Java language. The standard form of inheritance is by extension; a class declares that it extends another class, or an interface extends another interface. In this case, the sub-class or sub-interface inherits all the fields and methods of its parent.

The second special form of inheritance is where classes declare that they implement an interface, which has more limited consequences. When a class implements an interface, it inherits any fields from the parent as final constants, but must provide its own implementation of the interface methods.


Example:

import java.io.*;

class ClassA{

int x;
int y;
int get(int p, int q){
x=p; y=q;
return(0);
}
void Show(){
System.out.println("Value of x:" + x);
System.out.println("Value of y:" + y);
}
}

class ClassB extends ClassA{

public static void main(String args[]) throws IOException{
BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Please enter number of x!");
int x= Integer.parseInt(buff.readLine());
System.out.println("Please enter number of y!");
int y= Integer.parseInt(buff.readLine());

ClassA call = new ClassA();
call.get(x,y);
call.Show();
}
void display(){
System.out.println("B");
}

}


------------------------------------------

Visit for more information.

http://www.roseindia.net/java/language/inheritance.shtml

Thanks.


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