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/**  
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public class TestStringFormat {    
  public static void main(String[] args) {    
    int youNumber = 19;    
    // 0 ´ú±íÇ°Ãæ²¹³ä0    
    // 4 ´ú±í³¤¶ÈΪ4    
    // d ´ú±í²ÎÊýΪÕýÊýÐÍ    
    String str = String.format("%02d", youNumber);    
    System.out.println(str); // 01    
  }    
}   


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