Java：for-each-loop 中的“匿名”数组
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Java: "Anonymous" array in for-each-loop
提问by Atmocreations
While I was trying something special in for loop I recognized that Java doesn't seem to like putting an anonymous array right as the source for a for-each-loop:
当我在 for 循环中尝试一些特殊的东西时，我意识到 Java 似乎不喜欢将匿名数组作为 for-each-loop 的源：
for (String crt : {"a","b","c"} ) {
doSomething();
}
actually doesn't work while
实际上不起作用，而
String[] arr = {"a","b","c"};
for (String crt : arr ) {
doSomething();
}
does.
做。
Even casting the array to String[] doesn't help. When moving the cursor over the first version, eclipse tells me:
即使将数组转换为 String[] 也无济于事。将光标移到第一个版本上时，eclipse 告诉我：
Type mismatch: cannot convert from String[] to Stringwhile meaning "crt".
Type mismatch: cannot convert from String[] to String而意思是“crt”。
Is this a bug?
这是一个错误吗？
采纳答案by noah
This will work:
这将起作用：
for (String crt : new String[]{"a","b","c"} ) {
doSomething();
}
回答by Chris Dennett
Dunno, what about this? :) Pity there's no succinct version. Suppose you could use Groovy or Scala if you wanted anything like that :)
不知道，这个怎么办？:) 可惜没有简洁的版本。假设你可以使用 Groovy 或 Scala，如果你想要这样的东西:)
for (String s : Arrays.asList("a","b","c")) {
hmm(s);
}
回答by dbrown0708
You want
你要
for (String crt : new String [] {"a","b","c"} ) {
doSomething();
}
I use IntelliJ and it says put the message "expression expected" on the right-hand side of the colon in the for-loop, which seems more accurate.
我使用 IntelliJ，它说在 for 循环的冒号右侧放置“预期表达式”消息，这似乎更准确。
I should add that IntelliJ also offers to add the "new String []" automagically for me.
我应该补充一点，IntelliJ 还提供为我自动添加“新字符串 []”。
回答by Tom Castle
The Java language provides the {"a","b","c"}form as a shortcut, but it is only possible during assignment. It's possible this is to avoid possible ambiguities during parsing, in some positions {}could be interpreted as a code block.
Java 语言提供了{"a","b","c"}表单作为快捷方式，但只能在赋值期间使用。这可能是为了避免解析过程中可能出现的歧义，在某些位置{}可以解释为代码块。
The right way to do it would be how noah suggests, with new String[]{"a","b","c"}.
正确的方法是诺亚建议的，使用new String[]{"a","b","c"}.
