输出a-b之间的随机数并考虑异常

输出a-b之间的随机数并考虑异常

代码如下：

package Day05;
import java.util.Scanner;
import java.util.Random;

public class Homework1 {
/**
* 1、编写一个程序，从控制台读入int型整数a，b，
* 输出显示一个a和b之间(不包括a和b中较大的那个数)的随机数，
* 注意考虑异常情况。
*/
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a = 0, b = 0;
System.out.println("please enter 1st int number: ");
//输入1 c的异常情况会出错
// a = sc.nextInt();
// b = sc.nextInt();
if (sc.hasNextInt()) {
a = sc.nextInt();
}
System.out.println("please enter 2nd int number: ");
if (sc.hasNextInt()) {
b = sc.nextInt();
}
if (a != b) {
if (a > b) {
int temp = b;
b = a;
a = temp;
}
printRandomNum(a, b);
} else {
System.out.println("input error: a == b");
return;
}
}
private static void printRandomNum(int a, int b) {
Random rand = new Random();
int randNum = rand.nextInt(b - a) + a;
System.out.println("the random number is : " + randNum);
}
}