java对象的交互

package display;

public class Display {
private int value = 0;
private int limit = 0;
public Display(int limit)
{
this.limit=limit;
}
public void increase()
{

value++;
if(value==limit)
{
value = 0;
}
//System.out.println(value);

}

public int getvalue()
{
return value;
}

public static void main(String[] args) {
// TODO Auto-generated method stub
Display time = new Display(60);

time.increase();
}

}

package display;

public class Clock {
private Display hour = new Display(24);
private Display minute = new Display(60);

public void start()
{
while(true){
minute.increase();
if(minute.getvalue()==0)
{
hour.increase();
}
System.out.printf("%02d:%02d\n",hour.getvalue(),minute.getvalue());
}
}

public static void main(String[] args) {
// TODO Auto-generated method stub
Clock clock = new Clock();
clock.start();

}

}