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import java.text.NumberFormat; public class NumberFormatTest {     public static void main(String[] args) {
        //´ý²âÊÔÊý¾Ý
        int i = 1;
        //µÃµ½Ò»¸öNumberFormatµÄʵÀý
        NumberFormat nf = NumberFormat.getInstance();
        //ÉèÖÃÊÇ·ñʹÓ÷Ö×é
        nf.setGroupingUsed(false);
        //ÉèÖÃ×î´óÕûÊýλÊý
        nf.setMaximumIntegerDigits(4);
        //ÉèÖÃ×îСÕûÊýλÊý   
        nf.setMinimumIntegerDigits(4);
        //Êä³ö²âÊÔÓï¾ä
        System.out.println(nf.format(i));
    }
} À´Ô´£ºhttp://blog.csdn.net/xiaohunzhang/archive/2008/08/07/2782592.aspx £¨2£©·½·¨¶þ£¨¸öÈËÒÔΪ¸Ã·½·¨¼òµ¥ÓÐЧ£¬µ«¾­ÊÔÑéËƺõString.format()º¯ÊýÓÐÎÊÌ⣩ public class TestStringFormat {      
  public static void main(String[] args) {      
    int youNumber = 1;      
    // 0 ´ú±íÇ°Ãæ²¹³ä0      
    // 4 ´ú±í³¤¶ÈΪ4      
    // d ´ú±í²ÎÊýΪÕýÊýÐÍ      
    String str = String.format("%04d", youNumber);      
    System.out.println(str); // 0001      
  }      
}    
À´Ô´£ºhttp://liuwei1981.javaeye.c