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"); } }