java - 用数字作为单词比较两个字符串

Question

我得到了数字作为单词:

{"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"};

数字最多只有 10 个。我的任务是将给定的两个输入字符串相互比较。
当您比较两个数字时，它基本上应该起作用:

compare(1, 1) -> 0;
compare(1, 3) -> 1 < 3 as -1;
compare(5, 2) -> 5 > 2 as 1;

像这样比较两个字符串的最佳方法是什么？
结果看起来像这样:

compare("one", "one") -> 0;
compare("one", "three") -> -1;
compare("five", "two") -> 1;

public int compare(String a, String b) {
    return 0;
}

Answer 1

您可以使用映射对字符串及其值进行编码。这种方法的好处是它有 O(1)例如，与使用数组相反的复杂性。

Map<String, Integer> map = Map.of("one", 1, "two", 2, ...);

public int compare(String a, String b) {
      return Integer.compare(map.get(a),map.get(b));    
}

完整示例:

public class Example {

    private final static Map<String, Integer> STRING_VALUE =
            Map.of("one", 1, "two", 2, "three", 3, "four", 4, "five", 5,
                    "six", 6, "seven", 7, "eight", 8, "nine", 9, "ten", 10);

    public static int compare(String a, String b) {
        return Integer.compare(STRING_VALUE.get(a),STRING_VALUE.get(b));
    }

   public static void main(String[] args) {
       System.out.println(compare("one", "one"));
       System.out.println(compare("one", "three"));
       System.out.println(compare("five", "two"));
    }
}

输出:

0
-1
1

另一种解决方案是使用 ENUM:
完整示例:

public class Example {

    enum Values {
        ONE,
        TWO,
        THREE,
        FOUR,
        FIVE,
        SIX,
        SEVEN,
        EIGHT,
        NINE,
        TEN;
    }
    public static int compare(String a, String b) {
        Values vA = Values.valueOf(a.toUpperCase());
        Values vB = Values.valueOf(b.toUpperCase());
        return Integer.compare(vA.compareTo(vB), 0);
    }

   public static void main(String[] args) {
       System.out.println(compare("one", "one"));
       System.out.println(compare("one", "three"));
       System.out.println(compare("five", "two"));
    }
}

输出:

0
-1
1