Question

我最近开始学习Java。我的老师给了我们这个作业，是关于编写下面的If-Else语句代码并将其转换为Switch-Case语句代码。我正确编写了If-Else语句代码，但无法将if和else-if转换为switch case语句。我越早得到答案越好。谢谢。

ive尝试添加一个开关，然后将每个数字更改为case 1，case 2等。

import javax.swing.JOptionPane;

public class ExerciseV {
  public static void main(String [] args){

 String rating;
    String performance;

     rating = JOptionPane.showInputDialog("What is your rating for the gymnast from (1-10)?");

     if(rating.equalsIgnoreCase("One")||rating.equalsIgnoreCase("one")||rating.equalsIgnoreCase("1")||
        rating.equals("Two")||rating.equalsIgnoreCase("two")||rating.equalsIgnoreCase("2")||
        rating.equals("Three")||rating.equalsIgnoreCase("three")||rating.equalsIgnoreCase("3")){
     System.out.println("You scored the performance a rating of: " + rating);
          performance = "BAD";
     System.out.println("You typed in the number "+ rating +" so they had a "+ performance +" performance.");
     }
     else if(rating.equals("Four")||rating.equalsIgnoreCase("four")||rating.equalsIgnoreCase("4")||
             rating.equals("Five")||rating.equalsIgnoreCase("five")||rating.equalsIgnoreCase("5")||
        rating.equals("Six")||rating.equalsIgnoreCase("six")||rating.equalsIgnoreCase("6")){
     System.out.println("You scored the performance a rating of: " + rating);
          performance = "AVERAGE";
     System.out.println("You typed in the number "+rating+" so they had a "+performance+" performance.");
     }

所有这些都是正确的，但我只是不知道在哪里以及如何将开关盒放入该程序中。

Answer 1

我认为这段代码可以为您提供帮助

switch(rating.toUpperCase()) { 
        case "ONE":
        case "1":
        case "TWO":
        case "2":
            performance = "BAD";
            break;

        case "THREE":
        case "3":
        //...
    }

现在，将这种类型的解决方案适应您的实际问题

如何将if和else-if语句转换为切换用例？

1 个答案: