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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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