编写程序，将两个文件内容合并到一个文件中。

执行代码：

package day3;
     import java.io.BufferedReader;
     import java.io.BufferedWriter;
     import java.io.FileNotFoundException;
     import java.io.FileReader;
     import java.io.FileWriter;
     import java.io.IOException;

public class test {
    public static void main(String[] args) {
        try {
            FileReader fr1 = new FileReader("E:\\Java\\a.txt");
            FileReader fr2 = new FileReader("E:\\Java\\b.txt");
            BufferedReader br1 = new BufferedReader(fr1);
            BufferedReader br2 = new BufferedReader(fr2);
            BufferedWriter bw3 = new BufferedWriter(new FileWriter("E:\\Java\\c.txt"));
            String s, s1, s2;
            s = br1.readLine();
            s1 = br2.readLine();
            while (s != null) {
                bw3.write(s);
                s = br1.readLine();
                bw3.newLine();
            }
            while (s1 != null) {
                bw3.write(s1);
                s1 = br1.readLine();
                bw3.newLine();
            }
            br1.close();
            br2.close();
            bw3.close();
            System.out.println("文件合并成功!");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

执行结果：

两个文件合并到第三个文件

·先调试后运行