package edu.sjtu.erplab.io;

import java.util.Random;

public class RandomTest {
  public static void main(String[] args) {
    int max=20;
    int min=10;
    Random random = new Random();

    int s = random.nextInt(max)%(max-min+1) + min;
    System.out.println(s);
  }
}

Random rand = new Random();
int randNum = rand.nextInt(3);

int randNum = rand.nextInt(22)+5;

public class RandomTest {
  public static void main(String[] args) {
    int max = 10;
    int min = 2;
    //生成10个指定范围的随机数
    Random random = new Random();
    for(int i=0; i<10; i++){
      int n = random.nextInt(max-min+1)+min;
      System.out.print(n+" ");
    }
    System.out.println();
    for(int i=0; i<10; i++){
      int n = (int)(Math.random()*(max-min+1)+min);
      System.out.print(n+" ");
    }
  }
}

import java.util.Random;
public class RandomTest {
  public static void main(String[] args) {
    int min=10;
    int max=20;
    Random random = new Random();

    //int s = random.nextInt(max)%(max-min+1) + min;
　　　　　int s = random.nextInt(max-min+1) + min;

    System.out.println(s);
  }
}