//用java语言编写的一个数字时钟。importjavax.swing.*;importjava.awt.*;importjava.util.*;importjava.text.*;classClockextendsThread{ClockTestc;Clock(ClockTestc){this.c=c;}publicvoidrun(){while(true){try{Thread.sleep(1000);}catch(InterruptedExceptione){e.printStackTrace();}SimpleDa