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 stubDisplay time = new Display(60);time.increase();}}

在另一个类中调用上一个类的函数：

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();}}