Define an interface Lockable containing functions- open() and close(). Define 2 classes, File and cupboard that implements Lockable interface with other details. Call the functions using the variable of Lockable. source file name: MediaDemo.java //interface Lockable have open().close() abstract methods interface Loc…

Define an interface Controllable containing two functions- start() and stop(). Define 2 classes Television and Game that implements Controllable interface with other details. Call the functions using variable Controllable.  source file name:   LockDemo.java // interfaceControllable have start (),stop () abstract met…

Interfaces are sometimes used to indicate which classes have a certain capability or characteristic. Consider the following classes and interfaces. The abstract class Animal has abstract subclasses named Bird and reptile. Classes Dove, eagle Hawk, Penguin and Seagull extend Bird. Classes Rattle Snake and Turtle exte…

Write an application that combines several classes and interfaces. An abstract class Robot has concrete subclasses named RobotA, RobotB, RobotC. Class RobotA1 extends RobotA. Classes RobotB1 and RobotB2 extends RobotB. Class RobotC1 extends RobotC. The locomotion interface declares three methods name forward() and s…

interface A { public void add(int a, int b); } interface B { public void sub(int a, int b); } class C implements A, B { void fact(int n) { int f=1; for(;n>0;n--) { f=f*n; } System.out.println("Factorial value  "+f); } public void add(int a, int b) { System.out.println("add= "+(a+b)); } public …

class A { void sqcube(int n) { int sq=n*n; int c=n*n*n; System.out.println("square "+sq+ " cube "+c); } } interface C { public void display(); } class B extends A implements C { void add(int a, int b) { System.out.println("add= "+(a+b)); } public void display() { System.out.println("…