随机产生10个整数，然后将这10个整数按从小到大的顺序输出到控制台

具体要求看图片

不多做解释，代码很简单，仔细看就能懂

package Demo3;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

import lombok.ToString;

public class RandDemo {
    //创建10个随机数
    public static void main(String[] args) throws Exception {
        int arr[] = new int[10];
        for (int j = 0; j < arr.length; j++) {
            int rand = new Random().nextInt(100) + 1;
            arr[j] = rand;
        }
        String str = toString(arr);
        System.out.println(str);
        outarr(str);
        reader();
    }
    //读取文件并且进行排序然后输出
    public static void reader() throws Exception {
        File file1 = new File("C:\\Users\\Administrator\\Desktop\\456.txt");
        BufferedReader br = new BufferedReader(new FileReader(file1));
        String str = null;
        String str2 = null;
        while ((str = br.readLine()) != null) {
            str2 = str;
        }
        br.close();
        String[] arr = str2.split(",");
        List<Integer> list = new ArrayList<Integer>();
        for (String string : arr) {
            if (string != null && !"".equals(string)) {
                list.add(Integer.parseInt(string));
            }
        }

        Collections.sort(list);
        System.out.println(list);

    }
    //将字符串写入到文件
    public static void outarr(String str) throws Exception {
        File file = new File("C:\\Users\\Administrator\\Desktop\\456.txt");
        if (!file.exists()) {
            file.createNewFile();
        }
        BufferedWriter bw = new BufferedWriter(new FileWriter(file));
        bw.write(str);
        bw.flush();
        bw.newLine();
        bw.close();
    }
    //将数组转换为字符串
    public static String toString(int[] arr) {
        // 1.定义个临时容器
        String temp = "";
        // 2.遍历数组，字符串自加
        for (int x = 0; x < arr.length; ++x) {
            temp += arr[x] + ",";
        }
        if (temp.length() > 0) {
            temp = temp.substring(0, temp.length() - 1);
        }
        return temp + "";
    }

}