java 不能使用 char 类型的 ArrayList 作为方法的参数
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Cannot use ArrayList of type char as method's argument
提问by J.Olufsen
Cannot define ArrayList<char>as argument of validate. Why it cannot be done? When trying ArrayList<?>it works. Why? Should ArrayList<?>be used instead of ArrayList<char>? What is the difference?
不能定义ArrayList<char>为 的参数validate。为什么做不到？当尝试ArrayList<?>它的工作。为什么？应该ArrayList<?>用ArrayList<char>? 有什么区别？
public boolean validate(ArrayList<char> args){ ... }
Error: Syntax error on token "char", Dimensions expected after this token
错误： Syntax error on token "char", Dimensions expected after this token
回答by Bozho
public boolean validate(List<Character> args){ ... }
It has to be the wrapper type - Character- List<Character>. You can't use generics with primitive types.
它必须是包装器类型 - Character- List<Character>。您不能对原始类型使用泛型。
回答by Pau Kiat Wee
回答by npinti
You could try to do something like so: public boolean validate(ArrayList<Character> args){ ... }
你可以尝试做这样的事情： public boolean validate(ArrayList<Character> args){ ... }
回答by Makoto
In general, when you'r dealing with a generic object, such as ArrayList<T>, you are required to use objects. The difference between charand Characteris that Characteris an object, and is permitted to be used inside of a generic object.
通常，当您处理通用对象（例如 ）时ArrayList<T>，您需要使用对象。char和之间的区别在于Character它Character是一个对象，并且允许在通用对象内部使用。
For reference, each primitive type has their own wrapper object. You can check that out here.
作为参考，每个原始类型都有自己的包装对象。你可以在这里查看。
回答by Arianule
The wrapper class of char in Java is Character and char should be specified as Character when adding char objects or validating char objects in an ArrayList.
Java中char的包装类是Character，在ArrayList中添加char对象或验证char对象时，应将char指定为Character。
ArrayList<Character>list = new ArrayList<Character>();
