Generating random numbers in Java

There are two ways to generate random numbers in Java:

First, use the instance object of the Random class to generate:

Random r = new Random();
int i =r.nextInt(99)+1; //产生1-100之间的随机整数

Second, use the random number of the Math class () method generation:

int i= (int)(Math.random()*99+1); //产生的1-100之间的实数，强制类型取整

Let’s use specific code to demonstrate the specific usage

import java.util.Random;  
  
public class RandomTest {  
  
    public static void main(String[] args) {  
  
        //利用Random类的实例  
        Random r = new Random();  
        int count=0;  
        System.out.println("Random类生成的数为：");  
        while(count<10){  
            int i =r.nextInt(99)+1;//产生1-100以内的随机数  
            count++;  
            System.out.println("第"+count+"个数为："+i);  
        }  
          
        //利用Math类的random()方法  
        System.out.println("Math类生成的数为：");  
        int count1=0;  
        while(count1<10){  
            int i =(int)(Math.random()*99+1);//产生1-100以内的随机数  
            count1++;  
            System.out.println("第"+count1+"个数为："+i);  
        }  
          
          
    }  
  
}

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