Java 用另一个替换列表中的元素
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replace elements in a list with another
提问by chaotictranquility
How do I replace elements in a listwith another?
如何将 a 中的元素替换list为另一个？
For example I want all twoto become one?
例如我想全部two变成one?
采纳答案by polygenelubricants
You can use:
您可以使用：
Collections.replaceAll(list, "two", "one");
From the documentation:
从文档：
Replaces all occurrences of one specified value in a list with another. More formally, replaces with
newValeach elementein list such that(oldVal==null ? e==null : oldVal.equals(e)). (This method has no effect on the size of the list.)
用另一个替换列表中一个指定值的所有出现。更正式地说，用列表中的
newVal每个元素替换，e使得(oldVal==null ? e==null : oldVal.equals(e)). （此方法对列表的大小没有影响。）
The method also return a booleanto indicate whether or not any replacement was actually made.
该方法还返回 aboolean以指示是否实际进行了任何替换。
java.util.Collectionshas many more staticutility methods that you can use on List(e.g. sort, binarySearch, shuffle, etc).
java.util.Collections还有更多的static实用方法，你可以使用List（例如sort，binarySearch，shuffle等）。
Snippet
片段
The following shows how Collections.replaceAllworks; it also shows that you can replace to/from nullas well:
下面显示了如何Collections.replaceAll工作；它还表明您也可以替换null为：
List<String> list = Arrays.asList(
"one", "two", "three", null, "two", null, "five"
);
System.out.println(list);
// [one, two, three, null, two, null, five]
Collections.replaceAll(list, "two", "one");
System.out.println(list);
// [one, one, three, null, one, null, five]
Collections.replaceAll(list, "five", null);
System.out.println(list);
// [one, one, three, null, one, null, null]
Collections.replaceAll(list, null, "none");
System.out.println(list);
// [one, one, three, none, one, none, none]
