使用FileInputStream、FileOutputStreaem和FileReader、FileWriter分别进行拷贝。 （2）使用字节流拷贝时, 定义一个1024长度的字节数组作为缓冲区，使用字符流拷贝。

好的，我明白了你的问题。以下是对你的问题的回答：

1. 使用FileInputStream、FileOutputStreaem和FileReader、FileWriter分别进行拷贝：

使用FileInputStream和FileOutputStream进行拷贝：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        try {
            FileInputStream in = new FileInputStream("source.txt");
            FileOutputStream out = new FileOutputStream("target.txt");
            byte[] buffer = new byte[1024];
            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
            in.close();
            out.close();
            System.out.println("File copied successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用FileReader和FileWriter进行拷贝：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        try {
            FileReader in = new FileReader("source.txt");
            FileWriter out = new FileWriter("target.txt");
            int c;
            while ((c = in.read()) != -1) {
                out.write(c);
            }
            in.close();
            out.close();
            System.out.println("File copied successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. 使用字节流拷贝时, 定义一个1024长度的字节数组作为缓冲区，使用字符流拷贝。

使用字节流拷贝：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        try {
            FileInputStream in = new FileInputStream("source.txt");
            FileOutputStream out = new FileOutputStream("target.txt");
            byte[] buffer = new byte[1024];
            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
            in.close();
            out.close();
            System.out.println("File copied successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用字符流拷贝：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        try {
            FileReader in = new FileReader("source.txt");
            FileWriter out = new FileWriter("target.txt");
            char[] buffer = new char[1024];
            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
            in.close();
            out.close();
            System.out.println("File copied successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

希望这些代码可以帮助到你！