Interface methods

[DeltaWarrior]

I'm a beginner too. I've been having the same problems. Could anyone just tell me what modifications must be made for the below program to work(that is no more"weaker access privileges" stuff)

fandemo.java

interface fani
{

 void switch_on();
 void switch_off();
 void faster();
 void slower();
 void state_info();

}

class fan implements fani
{
 int power=0; /** POWER; 1=ON; 0=OFF*/
 int speed=1; /** SPEED=1,2,3,4. */

 void switch_on()
  {
   power=1; //switch on the fan
  }

 void switch_off()
 {
  power=0; //switch off the fan
 }

 void faster()
 {
  if(speed==4)return; //maximum speed

  else speed++; //increase speed one step
 }

 void slower()
 {
  if(speed==1)return; //minimum speed

  else speed--;
 }

 void state_info()
 {
  System.out.print("\n power="+power+" and speed="+speed);
  //print the state of fan
 }


}




class fandemo
{
   public static void main(String args[])
   {
   int a;
   fan fan1=new fan();
   fan fan2=new fan(); //two fans

   System.out.println("Hello there!! \n");
   fan1.switch_on();
   fan1.faster();
   fan1.faster();

   fan1.state_info();
   System.out.printf("\n");
   fan2.state_info();

   }
}

The error is like the method in the class cannot implement the one in the interface etc.
Pls help.

[rajivjoshi]

wht if suppose we make the methods of the class fan as public with proper return type?

[JosAH]

I moved these posts from an old thread to this new thread. Next time don't resurrect an old zombie thread but start your own new thread.

kind regards,

Jos

[rajivjoshi]

If you make the methods of the class fan as public it will work fine. i tired it please find the image.