package com.test.test;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class DataInputstream {
           public static void main(String[] args) throws Exception {
         FileOutputStream out = new FileOutputStream("D:/a.dat");
         //DataOutputStream可以将各种各样的数据转换为二进制
         DataOutputStream dout = new DataOutputStream(out);
         String name = "zhangsan";
         int num = 100;
         float f = 100.8f;
         double d = 10088.00d;
         //为了让解析工具知道这个字符串有多长，还会在字符串前面加前缀。
         //表示这个字符串有多长，8个字节的字符串，还有两个字节的前缀，会写入10个字节
         dout.writeUTF(name);
         //4个字节
         dout.writeInt(num);
         //4个字节
         dout.writeFloat(f);
         //8个字节
         dout.writeDouble(d);
         FileInputStream in = new FileInputStream("D:/a.dat");
         DataInputStream din = new DataInputStream(in);
         String readUTF = din.readUTF();
         System.out.println(readUTF);
         int readInt = din.readInt();
         System.out.println(readInt);
         float readFloat = din.readFloat();
         System.out.println(readFloat);
         double readDouble = din.readDouble();
         System.out.println(readDouble);
       }
}