java修改本地文件名称

import java.io.*;

public class TestMain3 {
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?public static void main(String[] args) {
??
??File file = new File("D:\\yubiyezhucebiao1.xls");
??
??String name = "2";
??
??String filename = file.getAbsolutePath();
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??filename = filename.substring(0, filename.lastIndexOf("."));
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??file.renameTo(new File(filename + name + ".xls"));
?}

}