用于操作基本类型数据的流对象

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

/*

 * 可以用于操作基本类型数据的流对象

 */

public class DataStreamDemo {

public static void main(String[] args) {
try {
writeData();
readData();
/*writeUTFDemo();
readUTFDemo();*/
} catch (IOException e) {
e.printStackTrace();
}

}

//写utf的过程

public static void  writeUTFDemo() throws IOException{
DataOutputStream dos=new DataOutputStream(new FileOutputStream("d:\\utf.txt"));
dos.writeUTF("你好");
dos.close();

}

//读utf的过程

public static void  readUTFDemo() throws IOException{
DataInputStream dis=new DataInputStream(new FileInputStream("d:\\utf.txt"));
System.out.println(dis.readUTF(dis));
dis.close();

}

//读的过程

public static void  readData() throws IOException{
DataInputStream dis=new DataInputStream(new FileInputStream("d:\\data.txt"));
int num=dis.readInt();
boolean b=dis.readBoolean();
double d=dis.readDouble();
System.out.println("num="+num);
System.out.println("b="+b);
System.out.println("d="+d);
dis.close();

}

//写的过程

public static void  writeData()throws IOException {
DataOutputStream dos=new DataOutputStream(new FileOutputStream("d:\\data.txt"));
dos.writeInt(123);
dos.writeBoolean(true);
dos.writeDouble(98.65);

}

}

输出结果：