File类

import java.io.File;
/**
测试file类
*/
public class TestFile {

public static void main(String[] args) {

File f = new File("d:\a.txt");
System.out.println(f);
f.renameTo(new File("d:/bb.txt"));

System.out.println(System.getProperty("user.dir"));

File f2 = new File("gg.txt");
f2.createNewFile();

}

}