Java 如何找到一个集合的长度？
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how to find the length of a set?
提问by user2872261
I'm trying to find the lentgh of a set from a preference. I tired set.length, but it doesnt work. Anyone know another way to find a length of a set?
我试图从偏好中找到一组的长度。我厌倦了 set.length，但它不起作用。有谁知道另一种方法来找到一个集合的长度？
set = prefs.getStringSet("key", null);
int X = set.length; //it doesn't like length....
回答by Rahin
I believe instead of set.length, you'll want to call set.size()
我相信而不是 set.length，你会想要打电话 set.size()
回答by Terry
Your set is a Set<String>, not a String[]. So you have to call:
你的集合是一个Set<String>，而不是一个String[]。所以你必须调用：
int x = set.size();
