//----------------------------------------------------覆蓋原有

import java.io.*;

public class A{
public static void main(String [] args) throws Exception{

FileWriter fw = new FileWriter("gg.txt");
fw.write("你好!!");
fw.close();
}
}

//---------------------------------------------------加在尾端

import java.io.*;

public class A{
public static void main(String [] args) throws Exception{

FileWriter fw = new FileWriter("gg.txt", true);
fw.write("你好!!");
fw.close();
}
}

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