【JAVA 17.5】+ IO

练练手~~

实现代码：

package SevenTeen;import java.io.*;import java.util.Date;public class Five {    public static void main(String[] args) throws Exception{        try{        DataOutputStream f2 = new DataOutputStream(new FileOutputStream("f.dat"));        int a = 0;        while(a <= 5){            f2.writeInt(a);            a++;        }        Date d = new java.util.Date();        String s = "" + d;        f2.writeUTF(s);        f2.writeDouble(5.5);        }catch (Exception e){            e.printStackTrace();        }    }}