创建带有重复元素的列表 [英] Creating a list with repeating element

问题描述

Java中是否存在一种实用程序方法，该方法可以生成具有指定长度的列表或数组，并且所有元素都等于指定值(例如["foo"，"foo"，"foo"，"foo"，"foo"])?

Is there an utility method in Java that generates a list or array of a specified length with all elements equal to a specified value (e.g ["foo", "foo", "foo", "foo", "foo"])?

推荐答案

您可以使用

You can use Collections.nCopies. Note that this copies the reference to the given object, not the object itself. If you're working with strings, it won't matter because they're immutable anyway.

List<String> list = Collections.nCopies(5, "foo");
System.out.println(list);

[foo, foo, foo, foo, foo]

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