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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