[英]Assigning an array to an ArrayList in Java
是否可以将array
分配给 Java 中的ArrayList
?
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()
:或者, 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。
The Arrays
class contains an asList
method which you can use as follows: Arrays
类包含一个asList
方法,您可以按如下方式使用它:
String[] words = ...;
List<String> wordList = Arrays.asList(words);
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.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。 like this:像这样:
String array1[] = getIntent().getExtras().getStringArray("key1"); or
String array1[] = ...
then
List<String> allEds = new ArrayList<String>();
Collections.addAll(allEds, array1);
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]
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