java 优雅地编写一个初始化的静态哈希表
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原文地址: http://stackoverflow.com/questions/7775919/
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writing an initialized static hashtable elegantly
提问by I J
Is there a way to write a static final Hashtable in java in key value pairs just like you can initialize a string array conveniently as :
有没有办法在Java中以键值对的形式编写静态最终Hashtable，就像您可以方便地初始化字符串数组一样：
String [] foo = {"A","AB"};
Basically what I mean is not having to write the words "put" for key:value pairs but instead may be something like:
基本上我的意思是不必为键：值对写“放置”这个词，而是可能是这样的：
Hashtable<String, String> foo = {"JJ":"222","KK":"222"}
which IMO looks more elegant.
IMO 看起来更优雅。
(I know the initialization would need to be in a static block. I am leaving that out for now)
（我知道初始化需要在一个静态块中。我现在不考虑了）
回答by brcosta
An anonymous inner class would give you double brace initialization, which is useful in some cases:
匿名内部类会给你双括号初始化，这在某些情况下很有用：
static final Map<String, String> map = new HashMap<String, String>() {{
put("foo", "bar");
put("x", "y");
}};
In any case, @michael667's answer is probably the best
无论如何，@michael667 的答案可能是最好的
回答by michael667
You can use guava's ImmutableMap:
您可以使用番石榴的ImmutableMap：
map = ImmutableMap.of(key1, value1, key2, value2);
These convenience methods exist for one to five elements. If you need more, you can use an ImmutableMap.Builder:
这些方便的方法适用于一到五个元素。如果需要更多，可以使用ImmutableMap.Builder：
static final ImmutableMap<String, Integer> WORD_TO_INT =
new ImmutableMap.Builder<String, Integer>()
.put("one", 1)
.put("two", 2)
.put("three", 3)
.build();
回答by rlibby
No, Java doesn't have map literals, but it does have array literals.
不，Java 没有映射文字，但它有数组文字。
static final Map<String, String> map;
static {
map = new HashMap<String, String>();
String[][] pairs = {
{"foo", "bar"},
{"x", "y"}
};
for (String[] pair : pairs) {
map.put(pair[0], pair[1]);
}
}
Of course this doesn't really add anything to the straightforward copy and paste putsolution, and it doesn't work well if your key and value types aren't the same.
当然，这并没有真正为简单的复制和粘贴put解决方案添加任何东西，如果您的键和值类型不相同，它就不会很好地工作。
回答by Matthew Flaschen
No, you're looking for something like C#'s collection initializers, which doesn't currently exist in Java.
不，您正在寻找类似于 C# 的集合初始值设定项的东西，它目前在 Java 中不存在。
You can use an anonymous class to save a little typing, but you still have to write put.
您可以使用匿名类来节省一点输入，但您仍然必须编写put.
