String的format方法--应用

    //格式化日期
    public static void main(String[] args) {
        String s = String.format("%1$tY-%1$tm-%1$td", new Date());
        System.out.println(s);
    }

    //格式化日期2
    public static void main(String[] args) {
        String s = String.format("%1$tY/%1$tm/%1$td", new Date());
        System.out.println(s);
    }

    //格式化日期3
    public static void main(String[] args) {
        String s = String.format("%1$tm-%1$td-%1$tY", new Date());
        System.out.println(s);
    }

    public static void main(String[] args) {
        String s = String.format("这位是%2$s，那位是%1$s", "小明","小黄");
        System.out.println(s);
    }

//格式化数字
    public static void main(String[] args) {
        //%[argument_index$][flags][width][.precision]conversion
        //%[argument_index$] : %1$
        //flag:, 金额千分位隔开
        //conversion : d 代表十进制展示
        String s = String.format("%1$,d", 12302562);
        System.out.println(s);
    }