生成文件信息

import java.io.File;
import java.io.FileOutputStream;
public class Creat {
    public static void main(String[] args){
        try {
            File f = new File("F:\\Exercise19_1.txt");
            if (!f.exists()) {
                f.createNewFile();
            }
            FileOutputStream output = new FileOutputStream(f);
            for(int i = 1;i < 100;i++){
                output.write(String.valueOf((int)(Math.random()*1000) + " ").getBytes());
            }
            output.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}