IO流 DataInputStream和DataOutputStream 用于操作基本数据类型

操作基本数据类型用DataInputStream和DataOutputStream 方便/*
DataInputStream与DataOutputStream

可以用于操作基本数据类型的数据的流对象。

*/
import java.io.*;
class DataStreamDemo
{
public static void main(String[] args) throws IOException
{
//writeData();
//readData();

//writeUTFDemo();

// //OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("gbk.txt"),"gbk");
//
// //osw.write("你好");
// //osw.close();

// readUTFDemo();

}
public static void readUTFDemo()throws IOException
{
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("utfdate.txt"));

dos.writeUTF("你好");//修改版的UTF-8只能用.readUTF读取，其他方法会读取失败

dos.close();
}

public static void readData()throws IOException
{
DataInputStream dis = new DataInputStream(new FileInputStream("data.txt"));
                //直接读取基本数据类型，不需要存入数组再强转为字符串
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();
}
public static void writeData()throws IOException
{
DataOutputStream dos = new DataOutputStream(new FileOutputStream("data.txt"));
                //直接写入基本数据类型
dos.writeInt(234);
dos.writeBoolean(true);
dos.writeDouble(9887.543);

dos.close();

}
}