用于操作基本数据类型的流对象

import java.io.*;
class  DataStreamDemo
{
public static void main(String[] args) throws IOException
{
//method1();
readUTFDemo();
//writeUTFDemo();
}
public static void method()throws IOException
{
DataOutputStream dos=new DataOutputStream(new FileOutputStream("data.txt"));
dos.writeInt(234);//为什么用记事本打开全是乱码，因为记事本显示的是字符，它会将里面写入的字节去查表，把表中对应的字符显示出来。
dos.writeBoolean(true);
dos.writeDouble(9887.543);
dos.close();
}
public static void method1()throws IOException
{
DataInputStream dis=new DataInputStream(new FileInputStream("data.txt"));
int num=dis.readInt();
boolean b=dis.readBoolean();
double d=dis.readDouble();
System.out.println(num);
System.out.println(b);
System.out.println(d);
}
public static void readUTFDemo()throws IOException//用UTF-8 修改版格式编码写入的必须用相应的方法读！
{
DataInputStream dis=new DataInputStream(new FileInputStream("utf.txt"));
String s=dis.readUTF();
System.out.println(s);
dis.close();
}
public static void writeUTFDemo()throws IOException
{
DataOutputStream dos=new DataOutputStream(new FileOutputStream("utf.txt"));
dos.writeUTF("哈哈");
dos.close();
}
}