switch case异常处理机制

public class T3{

    public static void main(String[] args) {

            try{

                String kc="";

                System.out.println("请输入课程名称1，java，2，c++,3,js");

                Scanner input = new Scanner(System.in);

                int n=input.nextInt();

                switch (1){

                    case 1:

                        kc="java";

                        System.out.println("你选择的课程是"+kc);

                        break;

                    case 2:

                        kc="c++";

                        System.out.println("你选择的课程是"+kc);

                        break;

                    case 3:

                        kc="js";

                        System.out.println("你选择的课程是"+kc);

                        break;

                }

            }catch (Exception e){

                System.out.println("请输入相应的数字");

            }finally {

                System.out.println("欢迎指导");

            }

        System.out.println("退出");

    }

}