Question

这道java题怎么做啊？

在“JSJ17”项目中创建“sy2_6.java”程序，要求从键盘上输入1-4的数字，对应产生1-4位的随机数。

Answer 1

public class sy2_6 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入数字1-4");
int num = scanner.nextInt();
Random random = new Random();
switch (num) {
case 1:
System.out.println(random.nextInt(10));
break;
case 2:
System.out.println(random.nextInt(90) + 10);
break;
case 3:
System.out.println(random.nextInt(900) + 100);
break;
case 4:
System.out.println(random.nextInt(9000) + 1000);
break;
}
}
}