java生成随机数字,生成随机ID

java在代码中生成随机数字和ID的两个方法

import java.util.UUID;
import java.util.Random;
public class randomID {public static void main(String[] args) {// TODO Auto-generated method stubUUID uuid = UUID.randomUUID();String randomId = uuid.toString();System.out.println("随机 ID: " + randomId);String randomId2 = generateRandomId();System.out.println("随机 ID: " + randomId2);}public static String generateRandomId() {long timestamp = System.currentTimeMillis();Random random = new Random();int randomNumber = random.nextInt(10000);return timestamp + "_" + randomNumber;}
}