如何使用lambda表达式检查元素是否存在？ [英] How to check if element exists using a lambda expression?

问题描述

具体来说，我有TabPane，我想知道是否有特定ID的元素。

Specifically, I have TabPane, and I would like to know if there is element with specific ID in it.

所以，我想用lambda做这个Java中的表达式：

So, I would like to do this with lambda expression in Java:

boolean idExists = false;
String idToCheck = "someId";

for (Tab t : tabPane.getTabs()){
    if(t.getId().equals(idToCheck)) {
        idExists = true;
    }
}

推荐答案

尝试使用 <$ c Lambda Expression的$ c> anyMatch 。这是更好的方法。

Try to use anyMatch of Lambda Expression. It is much better approach.

 boolean idExists = tabPane.getTabs().stream()
            .anyMatch(t -> t.getId().equals(idToCheck));

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