How do I generate a range of random Numbers in Java

To generate a random integer between [min, Max],

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. NextInt (Max) represents generating random Numbers between [0, Max], and then taking the modulus of (max-min+1).

Take the generation of [10,20] random Numbers as an example, first generate a random number of 0-20, and then take the modulus of (20-10+1) to get the random number between [0-10], then add min=10, and finally generate a random number of 10-20

Generate random Numbers between 0 and 2, including 2

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

Generate random Numbers between 5 and 26, including 26

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

Many places in the workplace will encounter a need to get a random number within a specified range. The function in the API that directly utilizes Java to give cannot satisfy, need to make some change.

Example: generates 10 random Numbers in a specified range.

public class RandomTest {
  public static void main(String[] args) {
    int max = 10;
    int min = 2;
    //Generates 10 random Numbers in the specified range
    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+" ");
    }
  }
}

To generate a random integer between [min, Max]

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);
  }
}