1、在当前目录创建文件d.java。 2、文件中写入0.1到0.5，布尔值true，字符A和整数1234。 3、在读取该文件，将文件保存的信息显示在屏幕上。 使用Data包装流 java代码

1、在当前目录创建文件d.java。

import java.io.File;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        File file = new File("d.java");
        try {
            if (file.createNewFile()) {
                System.out.println("File created: " + file.getName());
            } else {
                System.out.println("File already exists.");
            }
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }
}

2、文件中写入0.1到0.5，布尔值true，字符A和整数1234。

import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        try {
            DataOutputStream out = new DataOutputStream(new FileOutputStream("d.java"));
            out.writeDouble(0.1);
            out.writeDouble(0.2);
            out.writeDouble(0.3);
            out.writeDouble(0.4);
            out.writeDouble(0.5);
            out.writeBoolean(true);
            out.writeChar('A');
            out.writeInt(1234);
            out.close();
            System.out.println("Successfully wrote to the file.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }
}

3、在读取该文件，将文件保存的信息显示在屏幕上。

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        try {
            DataInputStream in = new DataInputStream(new FileInputStream("d.java"));
            System.out.println(in.readDouble());
            System.out.println(in.readDouble());
            System.out.println(in.readDouble());
            System.out.println(in.readDouble());
            System.out.println(in.readDouble());
            System.out.println(in.readBoolean());
            System.out.println(in.readChar());
            System.out.println(in.readInt());
            in.close();
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }
}