第一种解决方案是使用
java.util.Random类:
import java.util.Random;Random rand = new Random();// Obtain a number between [0 - 49].int n = rand.nextInt(50);// Add 1 to the result to get a number from the required range// (i.e., [1 - 50]).n += 1;
另一种解决方案是使用
Math.random():
double random = Math.random() * 49 + 1;
要么
int random = (int)(Math.random() * 50 + 1);



