java 作为参数传递给 ArrayList 时，此处不允许使用数组初始值设定项
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Array initializer is not allowed here when passing as an argument to ArrayList
提问by Bala
I have some Modelclasses that I am trying to declare a list with them but I get Array initializer is not allowed here. What would be a simple work around?
我有一些Model类，我试图用它们声明一个列表，但我得到Array initializer is not allowed here. 什么是简单的解决方法？
...
public class M1 extends Model {}
public class M2 extends Model {}
...
List<Model> mObj = new ArrayList<Model>({M1, M2}) //expression expected
...
回答by ifloop
In Java 8you could make use of the Streams API:
在Java 8 中，您可以使用Streams API：
List<String> mObj = Stream.of("m1","m2","m3").collect(Collectors.toList());
Pre Java 8simply use:
Java 8 之前的版本只需使用：
List<Model> mObj = new ArrayList<>(Arrays.asList(m1, m2, m3));
For for information on this see:
有关这方面的信息，请参见：
回答by sol4me
You can use Arrays.asListwhich will return List<Model>and then you can pass it to the constructor of ArrayList. Noteif you assign directly Listreturn by Arrays.asListto List<Model>then call to method like add()will throw UnsupportedOperationExceptionbecause Arrays.asList return's AbstractList
您可以使用Arrays.asList它将返回List<Model>，然后您可以将其传递给ArrayList的构造函数。请注意，如果您直接分配Listreturn by Arrays.asListtoList<Model>然后调用方法 likeadd()将抛出，UnsupportedOperationException因为 Arrays.asList 返回的AbstractList
You should change
你应该改变
List<Model> mObj = new ArrayList<Model>({M1, M2}) //expression expected
to
到
List<Model> mObj = new ArrayList<Model>(Arrays.asList(M1, M2));
because constructor of class ArrayListcan take Collection<? extends Model>
因为类的构造函数ArrayList可以Collection<? extends Model>
