package clock;

public class Clock {

private Display hour =new Display(24);

private Display mintue =new Display(60);

public void start() {

for(;;) {

mintue.increase();

if(mintue.getvalue()==0) {

hour.increase();

}

//printf表示帶格式的輸出，“%02d”表示輸出一個整數(shù)，且一定占據(jù)兩個字符

System.out.printf("%02d:%02d\n", hour.getvalue(),mintue.getvalue());

}}

public static void main(String[] args) {

// TODO Auto-generated method stub

Clock clock = new Clock();

clock.start();

}

}

package clock;

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;

}

}

//可以得知現(xiàn)在的value的值

public int getvalue() {

return value;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Display d = new Display(24);

for (;;) {

d.increase();

System.out.println(d.getvalue());

}

}

}