泛型反射

[leyestd]

public static void printType(Type type, boolean isDefinition)
{
if (type instanceof Class)
{
Class<?> t = (Class<?>) type;
System.out.print(t.getName());
}
else if (type instanceof TypeVariable)
{
TypeVariable<?> t = (TypeVariable<?>) type;
System.out.print(t.getName());
if (isDefinition)
printTypes(t.getBounds(), " extends ", " & ", "", false);
}
else if (type instanceof WildcardType)
{
WildcardType t = (WildcardType) type;
System.out.print("?");
printTypes(t.getUpperBounds(), " extends ", " & ", "", false);
printTypes(t.getLowerBounds(), " super ", " & ", "", false);
}
else if (type instanceof ParameterizedType)
{
ParameterizedType t = (ParameterizedType) type;
Type owner = t.getOwnerType();
if (owner != null)
{
printType(owner, false);
System.out.print(".");
}
printType(t.getRawType(), false);
printTypes(t.getActualTypeArguments(), "<", ", ", ">", false);
}
else if (type instanceof GenericArrayType)
{
GenericArrayType t = (GenericArrayType) type;
System.out.print("");
printType(t.getGenericComponentType(), isDefinition);
System.out.print("[]");
}

}

这里
type instanceof WildcardType
type instanceof ParameterizedType
type instanceof TypeVariable
type instanceof GenericArrayType
分别代表什么

[展S开K双Y翼]

对象 instanceof 类
这是判断对象属于不属于这个类，是不是这个类的对象

[花谢尊前不敢香]

instanceof 的作用，就是判断前面的是否是后面的对象。

[Alexander]

等价于C#中的is

[jijihahalala]

instanceof 的作用，就是判断前面的是否是后面的对象。
比如Dog extends Animal 那么 Dog instanceof Animal确实如此，为true

[江湖啊江湖]

4楼我 -1..........

[zhaoming262350]

instanceof 用来判断这个对象属不属于后面的这个类，如果这个对象是类的对象，返回true，否则返回false