枚举类使用（从键盘输入）

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import java.util.*; public class EnumTest {     public static void main(String[] args){         Scanner in = new Scanner(System.in);         System.out.print("Enter a size:(SMALL,MEDIUM,LARGE,EXTRA_LARGE)");         String input = in.next().toUpperCase();         Size size = Enum.valueOf(Size.class, input); //返回给定名字给定类的枚举常量         System.out.println("size="+size);         System.out.println("abbreviation="+size.getAbbreviation());         if(size == Size.EXTRA_LARGE)             System.out.println("Good job--you paid attention to the _.");     } }   enum Size{     SMALL("S"),MEDIUM("M"),LARGE("L"),EXTRA_LARGE("XL");     private Size(String abbreviation){         this.abbreviation = abbreviation;     }     public String getAbbreviation(){         return abbreviation;     }           private String abbreviation; }