Java 字符串设置为 ArrayList？
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String set to ArrayList?
提问by JavaGrassHopper
So I was looking up how to change a Stringset to an ArrayList<sSring>and I couldn't find anything. I tried:
所以我一直在寻找如何将Stringset更改为 an ArrayList<sSring>，但我找不到任何东西。我试过：
favorites = new ArrayList( mPrefsaved.getStringSet("faves", null) ;
How can I convert a StringSetinto an ArrayList<string>?
如何将 a 转换StringSet为 a ArrayList<string>？
I tried:
我试过：
private void getsaved() {
favorites = new ArrayList<String>(mPrefsaved.getStringSet("faves", null));
}
But log Cat told me NullPointerException
但是日志猫告诉我 NullPointerException
采纳答案by henry4343
Use foreach in stringset and add each string to arraylist
在 stringset 中使用 foreach 并将每个字符串添加到 arraylist
ArrayList<String> arrayList = new ArrayList<String>();
for (String str : stringset)
arrayList.add(str);
回答by Suresh Atta
Consider you have a set of Strings like
考虑你有一组像
Set<String> set = new HashSet<String>();
// some elements in set
then you can try
那你可以试试
List<String> listFromSet = new ArrayList<String>(yourCurrentSet);
in your case .
在你的情况下。
List<String> listFromSet = new ArrayList<String>(mPrefsaved.getStringSet("faves", null));
Make sure that your method getStringSetreturns a collection of Strings.
确保您的方法getStringSet返回字符串集合。
