java 8无法访问的语句开关case case

Question

我们的老师告诉我们关于if-else声明，他正在教我们如何switch声明可以替代if-else所以我编码，我得到这个无法访问的声明错误。我不知道我是如何调试因为我刚刚将我的Java从6更新到了8，而且我真的不知道我的代码有什么问题。

import java.io.*; 
import java.util.Scanner; 
class Switch 
{ 
    public static void main(String[] args) 
    { 
     Scanner k = new Scanner(System.in); 

     System.out.println("Whats your name?"); 
     String name = k.nextLine(); 

     System.out.println("Do you want to compute your grades?"); 
     String yesNo = k.nextLine(); 

     switch(yesNo) 
     { 
      case "yes": 
       System.out.println("Input your attendance grade(10%)\n"); 
       int attendance = k.nextInt(); 
       System.out.println("Input your participation grade (10%)\n"); 
       int participation = k.nextInt(); 

       System.out.println("Input your quiz grade (10%)\n"); 
       int quiz = k.nextInt(); 

       System.out.println("Input your exam grade(40%)\n"); 
       int exam = k.nextInt(); 

       System.out.println("Input your lab grade (20%)\n"); 
       int lab = k.nextInt(); 

       double point10 = 0.10; 
       double point20 = 0.20; 
       double point40 = 0.40; 

       double attendanceC = attendance*point10; 
       double participationC = participation*point10; 
       double quizC = quiz*point20; 
       double examC = exam*point40; 
       double labC = lab*point20; 

       double yourGradeD = attendanceC+participationC+quizC+examC+labC; 
       int yourGrade = (int)yourGradeD; 
       break; 

      default: 
       System.out.println("Thank you "+name); 
       break; 

       switch(yourGrade) 
       { 
        case 99|98|97|96|95|94|93|92|91|90: 
         System.out.println("testing"); 
         break; 
       } 

     } 

    } 
} 

Answer 1

下面是正确的代码，你的内部开关确实是不可访问，因为它不含有case内。

在这里，我把它放到你的“是” case这是最合乎逻辑的。

注意：您的主开关只有两个选项：“是”或“默认”。在这种情况下，我宁愿用一个简单的if ...别的

switch(yesNo) 
    { 
     case "yes": 
     System.out.println("Input your attendance grade(10%)\n"); 
     int attendance = k.nextInt(); 
     System.out.println("Input your participation grade (10%)\n"); 
     int participation = k.nextInt(); 

     System.out.println("Input your quiz grade (10%)\n"); 
     int quiz = k.nextInt(); 

     System.out.println("Input your exam grade(40%)\n"); 
     int exam = k.nextInt(); 

     System.out.println("Input your lab grade (20%)\n"); 
     int lab = k.nextInt(); 

     double point10 = 0.10; 
     double point20 = 0.20; 
     double point40 = 0.40; 

     double attendanceC = attendance*point10; 
     double participationC = participation*point10; 
     double quizC = quiz*point20; 
     double examC = exam*point40; 
     double labC = lab*point20; 

     double yourGradeD = attendanceC+participationC+quizC+examC+labC; 
     int yourGrade = (int)yourGradeD; 

     if(yourGrade >= 90 && yourGrade <= 99) 
     { 
      System.out.println("testing"); 
     } 
     break; 


     default: 
     System.out.println("Thank you "+name); 
     break; 
    }