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();        }    }}