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An application that combines several classes and interface

Posted By: Easy Tutor     Category: Java     Views: 3163

Write an application that combines several classes and interface. The abstract class ROBOT has concret
subclasses ROBOTA, ROBOTB and ROBOTC. Class ROBOTA1 extends ROBOTA. Class ROBOTB1 and ROBOTB2 extends ROBOTB. Class ROBOTC1 extends ROBOTC. The LOCOMOTIVE interface declares three mthod name forward(), reverse(), and stop(). It is implemented by classes ROBOTB and ROBOTC. The SOUND interface declare method beep() method. It is implemented by classes ROBOTA1, ROBOTB1 and ROBOTC. Define all of the classes and implement the interfaces as specified. Create one instance of each class than invoke the beep() method of all the objects that are of type SOUND and also invoke the stop() method of all objects that are of type LOCOMOTIVE.

Code for An application that combines several classes and interface in Java

interface LOCOMOTIVE
{
    void forward();
    void reverse();
    void stop();
}

interface SOUND
{
   void beep();
}

class ROBOT
{
}

class ROBOTA extends ROBOT
{
}

class ROBOTB extends ROBOT implements LOCOMOTIVE
{
      publicvoid forward()
      { System.out.println("ROBOTB.FORWARD()"); }

      publicvoid reverse()
        { System.out.println("ROBOTB.REVERSE()"); }

      publicvoid stop()
        { System.out.println("ROBOTB.STOP()"); }
}

class ROBOTC extends ROBOT implements LOCOMOTIVE,SOUND
{
      publicvoid forward()
      { System.out.println("ROBOTC.FORWARD()"); }

      publicvoid reverse()
        { System.out.println("ROBOTC.REVERSE()"); }

      publicvoid stop()
        { System.out.println("ROBOTC.STOP()"); }

      publicvoid beep()
      { System.out.println("ROBOTC.BEEP()"); }
}

class ROBOTA1 extends ROBOTA implements SOUND
{
    publicvoid beep()
    {  System.out.println("ROBOTA1.BEEP()"); }
}

class ROBOTB1 extends ROBOTB implements SOUND
{
    publicvoid beep()
    {  System.out.println("ROBOTA1.BEEP()"); }   
}

class ROBOTB2 extends ROBOTB 
{
}

class ROBOTC1 extends ROBOTC
{
}

class  INSTANCEOF_example
{
       public final staticint totclass=7;
    publicstaticvoid main(String args[]) 
    {
    ROBOT  r[] = new ROBOT[totclass];
    r[0]=new ROBOTA();
    r[1]=new ROBOTB();
    r[2]=new ROBOTC();
    r[3]=new ROBOTA1();
    r[4]=new ROBOTB1();
    r[5]=new ROBOTB2();
    r[6]=new ROBOTC1();

          //for BEEP() method
          System.out.println("\nINSTANCEOF SOUND INTERFACE");
          for(int i=0;i<totclass;i++)
          {    
               if(r[i] instanceof SOUND)
               {
                    r[i].beep();
                }
         }

         System.out.println("\n\nINSTANCEOF LOCOMOTIVE INTERFACE");
         for (int i=0;i<totclass ;i++ )
         {
               if(r[i] instanceof LOCOMOTIVE)
               {
                    r[i].stop();
                }
         }
    }
}
  
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Easy Tutor
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