随机数之Math.random

 1 import java.util.Scanner;
 2 
 3 //从键盘输入一个范围[start,end],获取该范围内的随机数  
 4 //(int)(Math.random()*(end-start+1)+start);  
 5 public class RANDOM {  
 6 public static void main(String[] args){  
 7     Scanner sc=new Scanner(System.in);  
 8     System.out.print("请输入Range开始的数字");
 9     int start=sc.nextInt();  
10     System.out.print("请输入Range结束的数字");
11     int end=sc.nextInt(); 
12     System.out.println("请输入随机数长度");
13     int length=sc.nextInt();
14     for(int i=0;i<length;i++){  
15         System.out.print(get_random(start,end)+",");  
16     }  
17 }  
18 public static  int get_random(int start,int end){  
19     return (int)(Math.random()*(end-start+1)+start);  
20 }  
21 }