有没有更好的方法在Java中组合两个字符串集? [英] Is there a better way to combine two string sets in java?

问题描述

我需要组合两个字符串集，同时过滤掉多余的信息，这是我想出的解决方案，有人可以建议一种更好的方法吗?也许我忽略了内置的东西?谷歌没有运气.

  Set< String>oldStringSet = getOldStringSet();设置< String>newStringSet = getNewStringSet();for(字符串currentString:oldStringSet){如果(！newStringSet.contains(currentString)){newStringSet.add(currentString);}} 

解决方案

由于 Set 不包含重复的条目，因此可以通过以下方式将两者合并:

  newStringSet.addAll(oldStringSet); 

是否添加两次都没有关系，该集合将只包含一次元素...例如，不需要使用 contains 方法进行检查.

I need to combine two string sets while filtering out redundant information, this is the solution I came up with, is there a better way that anyone can suggest? Perhaps something built in that I overlooked? Didn't have any luck with google.

Set<String> oldStringSet = getOldStringSet();
Set<String> newStringSet = getNewStringSet();

for(String currentString : oldStringSet)
{
    if (!newStringSet.contains(currentString))
    {
        newStringSet.add(currentString);
    }
}

解决方案

Since a Set does not contain duplicate entries, you can therefore combine the two by:

newStringSet.addAll(oldStringSet);

It does not matter if you add things twice, the set will only contain the element once... e.g it's no need to check using contains method.

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