main.java

java的经典例子

import java.util.Date;

class Clock {
    private Date clockTime = new Date(96, 0, 1, 0, 0, 0);

    private static String fixWidth(int num) {
        if (num == 0) 
            return "00";
        if (num < 10)
            return ("0" + num);
        return (Integer.toString(num, 10));
    }
    private void updateLCD(boolean blink) {
        // could be replaced by more fancy GUI
        System.out.println(fixWidth(clockTime.getHours()) + ":" +
                           fixWidth(clockTime.getMinutes()) + ":" +
                           fixWidth(clockTime.getSeconds()));
        if (blink)
            updateLCD(false);        // recurse once
    }
    public void set(int hh, int mm, int ss) {
        clockTime.setHours(hh);
        clockTime.setMinutes(mm);
        clockTime.setSeconds(ss);

        updateLCD(false);        // do not blink after setting
    }
    public void display(boolean blink) {
        updateLCD(blink);
    }
}

class Main {
    public static void main(String[] args) {
        if (args.length != 3) {
            System.err.println("Usage: java Main <hh> <mm> <ss>");
            System.exit(-1);
        }
        int hours = Integer.parseInt(args[0]);
        int mins = Integer.parseInt(args[1]);
        int secs = Integer.parseInt(args[2]);

        Clock c = new Clock();
        c.display(true);  // blink

        c.set(hours, mins, secs);

        // ...
    }
}