检查 javax.lang.model.type.TypeMirror 是原始类型

Question

有什么方法可以检查 javax.lang.model.type.TypeMirror 是原始类型吗？我试过 instanceof PrimitiveType 但这总是会产生 true，因为 PrimitiveType 扩展了 TypeMirror。

感谢您的帮助。

Answer 1

每 https://docs.oracle.com/javase/7/docs/api/javax/lang/model/type/TypeMirror.html

To implement operations based on the class of an TypeMirror object, either use a visitor or use the result of the getKind() method. Using instanceof is not necessarily a reliable idiom for determining the effective class of an object in this modeling hierarchy since an implementation may choose to have a single object implement multiple TypeMirror subinterfaces.

尝试调用 getKind() 而不是 instanceOf。

Answer 2

如果你有TypeMirror object, you can get the kind of this type (TypeKind) with the getKind() method and then use the isPrimitive()方法。

if(typeMirror.getKind().isPrimitive()){
     //It's a primitive type
}

Answer 3

有2个选项：

检查它是否是原始类型

typeMirror.getKind().isPrimitive()

或者如果它是 PrimitiveType 的实例，则使用访问者来执行操作

typeMirror.accept(new SimpleTypeVisitor6<P, R>() {
    @Override R visitPrimitive(PrimitiveType t, P p) {
      //do something with primitive type t
    }
}, null);

检查 javax.lang.model.type.TypeMirror 是原始类型

Check javax.lang.model.type.TypeMirror is a primitive type

java

types

primitive