两个文本文件合并，IO流（Java）

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Demo {
    public static void main(String[] args) throws IOException {
        FileReader f1 = null;
        FileReader f2 = null;
        FileWriter w = null;
        int ch;
        
        //创建对象
        f1 = new FileReader("E:\Java\src\IOTest1\1.txt");
        f2 = new FileReader("E:\Java\src\IOTest1\2.txt");
        w = new FileWriter("E:\Java\src\IOTest1\3.txt", true);

        while ((ch = f1.read()) != -1) {
            w.write(ch);
            System.out.print((char)ch);
        }

        while ((ch = f2.read()) != -1) {
            w.write(ch);
            System.out.print((char)ch);
        }

        f1.close();
        f2.close();
        w.close();

    }
}