JavaOOP 异常

package exit3Exercise.com;import java.util.Scanner;public class Test {public static void main(String[] args) {Scanner input=new Scanner(System.in);System.out.println("请输入课程代号(1~3之间的数字)");try {int num=input.nextInt();if (num==1) {System.out.println("c#编程");}else if (num==2) {System.out.println("java编程");}else if (num==3){System.out.println("SQL基础");}} catch (Exception ex) {System.out.println("请输入整数");         ex.printStackTrace();}finally{System.out.println("欢迎提出建议");}}}