1，随机数组创建

import java.util.Random;

Random ran =new Random();
int a=ran.nextInt(2);

2 ,控制循环时间间隔

while(!result) {
            Thread.sleep(5 * 100); //设置暂停的时间 5 秒
                count++;
                if (count == 15) {
                    result = true;
                    break;
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }


        }

3，判定字符串是否相等

String s1 = new String("abc");
String s2 = new String("abc");
boolean result = s1.equals(s2);

System.out.println("The result is :" + result);