1 package FileDemo; 2  3 import java.io.DataInputStream; 4 import java.io.DataOutputStream; 5 import java.io.FileInputStream; 6 import java.io.FileOutputStream; 7 import java.io.IOException; 8  9 public class DataStream {10 11     /**12      * @param args13      * @throws IOException14      */15     public static void main(String[] args) throws IOException {16 17         DataOutputStream dos = new DataOutputStream(new FileOutputStream(18                 "data.txt"));19         dos.writeInt(2050);20         dos.close();21         DataInputStream dis = new DataInputStream(new FileInputStream(22                 "data.txt"));23         int num = dis.readInt();24         System.out.println("num=" + num);25         dis.close();26     }27 28 }