Question

我已经为此工作了三天，我无法解决这个问题。请帮忙！

public static void displayType (String ntype)
   {
       switch (ntype)

           case "African":
           System.out.print ("This Elephant is African")
           break;

           case "Indian":
           System.out.print ("This Elephant is Indian")
           break;

           default :
           System.out.print ("This type of Elephant is invalid")

           return ntype;
     } //End Switch


  }

这些是我得到的错误：

Lab2Unit4Psuedocode.java:108: error: class, interface, or enum expected
 public static void displayType (String ntype)
               ^

Lab2Unit4Psuedocode.java:116: error: class, interface, or enum expected
               case "Indian":
               ^

Lab2Unit4Psuedocode.java:120: error: class, interface, or enum expected
               default :
                       ^

Lab2Unit4Psuedocode.java:124: error: class, interface, or enum expected
         } //End Switch
         ^
4 errors

Answer 1

请查看以下代码中的评论。

public class Lab2Unit4Psuedocode {

   public static void displayType (String ntype) {
       switch (ntype) { //you need the open curly brace
           case "African":
                System.out.println("This Elephant is African"); //<-- you need to terminate with semi-colons in Java
                break;

           case "Indian":
                System.out.println("This Elephant is Indian");
                break;

           default:
                System.out.println("This type of Elephant is invalid");
                //some people add an explicit break here
         //don't return anything.  By definition, void means you return nothing.
       }
   }
} //always line up your curly braces

另请注意，在switch数据类型上使用String仅在Java 7中出现，因此这不适用于旧版本的Java。

Java需要大量的练习 - 坚持下去！

Answer 2

public static String displayType (String ntype)
{
   switch (ntype) {
  // Only version 1.7 or higher can support the string literal in switch
       case "African":
       System.out.print ("This Elephant is African");
       break;

       case "Indian":
       System.out.print ("This Elephant is Indian"); 
       break;

       default :
       System.out.print ("This type of Elephant is invalid");

       return ntype;
    } //End Switch


 }

我收到错误：类，接口或枚举预期，我无法弄清楚

2 个答案: