文件的复制粘贴

package com.qiku.HomeWork;

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

public class HW001 {
    public static void main(String[] args) throws IOException {
        
        FileWriter fileWriter = new FileWriter("D:\World\1_副本.txt");
        FileReader fileReader = new FileReader("D:\World\1.txt");
        char[] chars = new char[4];
        while (true){
            int read = fileReader.read(chars);
            if (read == -1){
                break;
            }else {
                fileWriter.write(chars,0,read);
            }
        }
        fileReader.close();
        fileWriter.close();

    }
}

package com.qiku.HomeWork;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class HW002 {
    
    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D:\World\1.txt");
        FileOutputStream fileOutputStream = new FileOutputStream("2.txt");
        byte[] bytes = new byte[12];
        while (true){
            int read = fileInputStream.read(bytes);
            if (read == -1){
                break;
            }else {
                fileOutputStream.write(bytes,0,read);
            }

        }
        fileInputStream.close();
        fileOutputStream.close();
    }
}

package com.qiku.HomeWork;

import java.io.*;

public class HW003 {
    
    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D:\World\1.txt");
        BufferedInputStream in = new BufferedInputStream(fileInputStream);
        FileOutputStream fileOutputStream = new FileOutputStream("2.txt");
        BufferedOutputStream  out = new BufferedOutputStream(fileOutputStream);
        byte[] bytes = new byte[1024];
        while (true){
            int read = in.read(bytes);
            if (read == -1){
                break;
            }else {
                out.write(bytes,0,read);
            }
        }
        in.close();
        out.close();
    }
}

package com.qiku.HomeWork;

import java.io.*;

public class Hw004 {
    
    public static void main(String[] args) throws IOException {
        FileReader fileReader = new FileReader("D:\World\1.txt");
        BufferedReader reader = new BufferedReader(fileReader);
        FileWriter fileWriter = new FileWriter("1.txt");
        BufferedWriter writer = new BufferedWriter(fileWriter);
        while (true){
            int read = reader.read();
            if (read != -1){
                writer.write(read);
            }else {
                break;
            }
        }
        reader.close();
        writer.close();
    }
}