DataInputStream和DataOutputStream

package other;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class DataStreamDemo {    public static void main(String[] args) throws IOException {        // writeData();        readData();    }    public static void writeData() throws IOException {        DataOutputStream dos = new DataOutputStream(new FileOutputStream(                "data.txt"));        dos.writeInt(24);        dos.writeBoolean(true);        dos.writeDouble(8999.9877);        dos.close();    }    public static void readData() throws IOException {        DataInputStream dis = new DataInputStream(new FileInputStream(                "data.txt"));        int num = dis.readInt();        boolean b = dis.readBoolean();        double d = dis.readDouble();        dis.close();        System.out.println("num= " + num + ", b= " + b + ", d= " + d);    }}