在 Java 中将数组分配给 ArrayList
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Assigning an array to an ArrayList in Java
提问by Steffan Harris
I was wondering if it is possible to assign an array to an ArrayList in Java.
我想知道是否可以将数组分配给 Java 中的 ArrayList。
回答by NullUserException
You can use Arrays.asList():
您可以使用Arrays.asList()：
Type[] anArray = ...
ArrayList<Type> aList = new ArrayList<Type>(Arrays.asList(anArray));
or alternatively, Collections.addAll():
ArrayList<Type> aList = new ArrayList<Type>();
Collections.addAll(theList, anArray);
Note that you aren't technically assigning an array to a List (well, you can't do that), but I think this is the end result you are looking for.
请注意，您并不是在技术上将数组分配给 List（好吧，您不能这样做），但我认为这是您正在寻找的最终结果。
回答by Richard Cook
The Arraysclass contains an asListmethod which you can use as follows:
本Arrays类包含asList您可以按如下方式使用方法：
String[] words = ...;
List<String> wordList = Arrays.asList(words);
回答by Andy
If you are importing or you have an array (of type string) in your code and you have to convert it into arraylist (offcourse string) then use of collections is better. like this:
如果您正在导入或您的代码中有一个数组（字符串类型）并且您必须将其转换为数组列表（课外字符串），那么使用集合会更好。像这样：
String array1[] = getIntent().getExtras().getStringArray("key1"); or
String array1[] = ...
then
List<String> allEds = new ArrayList<String>();
Collections.addAll(allEds, array1);
回答by JamesBong
This is working
这是工作
int[] ar = {10, 20, 20, 10, 10, 30, 50, 10, 20};
ArrayList<Integer> list = new ArrayList<>();
for(int i:ar){
list.add(new Integer(i));
}
System.out.println(list.toString());
// prints : [10, 20, 20, 10, 10, 30, 50, 10, 20]
