枚舉元素可以在Java中使用多於1個值

Question

enum Expression { 

    Good("good"), 
    Bad("bad");  

    private String name; 
    Expression(String str) { 
     this.name = str; 
    } 

    public String getName(){ 
     return name; 
    } 
} 

如果還可以使用相同的'好'來表示幾個，即「好」，「非常好」，「好」，但所有這些變化可以通過相同的Expression.Good訪問？這聽起來很奇怪，但如果可能的話，它確實很有用。任何解決方法，如果不可能？

如何在我的意圖中使用它？在這裏：

String str = "great"; 
String str2 = "good"; 

話，我想都是正確的：

If(Expression.Good.getName().equals(str)) { 
    // I want it to be true! 
    } 


    If(Expression.Good.getName().equals(str2)) { 
    // I want it to be true too! 
    } 

Answer 1

public enum Expression { 

    GOOD(Arrays.asList("Good", "Great", "Wonderfull")), 
    BAD(Arrays.asList("Bad", "Terrible"));  

    private final List<String> name; 
    private Expression(final List<String> str) { 
     this.name = str; 
    } 

    //Will return a immutable list with all the names 
    public final List<String> getName(){ 
     return name; 
    } 

    //Checks if the value has that name 
    public boolean hasName(String n) { 
     return name.contains(n); 
    } 
} 

Answer 2

我會用可變參數：

enum Expression { 

    POSITIVE("Good", "Great", "Awesome"), 
    NEGATIVE("Bad", "Get out"), 
    ; 

    private final String[] words; 

    private Expression(String... words) { 
     this.words = words; 
    } 

    public String getRandomWord() { 
     return this.words[ThreadLocalRandom.current().nextInt(this.words.length)]; 
    } 

    public boolean matches(String word) { 
     //can also use HashSet, and potentially consider matching against lowercase 
     return Arrays.stream(this.words).anyMatch(word); 
    } 
} 

將在我看來，最乾淨的語法，你可以將可變參數陣列放入Set或List，這裏有很大的靈活性。

if (Expression.POSITIVE.matches("Great")) { 
    //Great! 
}