标签:Type void 笔记 class 泛型 ParameterizedType type public
ParameterizedType
ParameterizedType represents a parameterized type such as Collection
源码:
public interface ParameterizedType extends Type {
/**
* Returns an array of {@code Type} objects representing the actual type
* arguments to this type.
Type[] getActualTypeArguments();
/**
* Returns the {@code Type} object representing the class or interface
* that declared this type.
/
Type getRawType();
/**
* Returns a {@code Type} object representing the type that this type
* is a member of. For example, if this type is {@code O<T>.I<S>},
* return a representation of {@code O<T>}.
/
Type getOwnerType();
}
要明白ParameterizedType
的含义,先看它的父类Type
:
/**
* Type is the common superinterface for all types in the Java
* programming language. These include raw types, parameterized types,
* array types, type variables and primitive types.
*
* @since 1.5
*/
public interface Type {
/**
* Returns a string describing this type, including information
* about any type parameters.
*
* @implSpec The default implementation calls {@code toString}.
*
* @return a string describing this type
* @since 1.8
*/
default String getTypeName() {
return toString();
}
}
Type
是一个表示Java语言中所有类型,包括原始类型, 参数化类型
, 数组类型类型变量以及基本类型。
所以ParameterizedType
表示参数化类型。
ParameterizedType
有三个方法:
@getActualTypeArguments
,@getRawType
,@getOwnerType
。多说无益处,直接看代码就明白了:
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
/**
* @author longxingjian <longxingjian@kuaishou.com>
* Created on 2021-03-15
*/
public class TestGenericInterface {
private class Food {
String foodName;
}
private interface Eat {
void eat(String things);
}
private interface Eat2<T> {
void eat(T things);
}
private interface Run {
void run();
}
private class Dog implements Eat, Run {
@Override
public void run() {
}
@Override
public void eat(String things) {
}
}
private class Cat implements Eat2<Food>, Run {
@Override
public void run() {
}
@Override
public void eat(Food things) {
}
}
public static void main(String[] args) {
Class<?> clazz = Dog.class;
Type[] genericInterfacesDog = clazz.getGenericInterfaces();
Class<?>[] interfacesDog = clazz.getInterfaces();
Class<?> clazz2 = Cat.class;
Type[] genericInterfacesCat = clazz2.getGenericInterfaces();
ParameterizedType type = (ParameterizedType) genericInterfacesCat[0];
Type[] actualTypeArguments = type.getActualTypeArguments();
Type rawType = type.getRawType();
String typeName = type.getTypeName();
Type ownerType = type.getOwnerType();
Class<?>[] interfacesCat = clazz.getInterfaces();
System.out.println();
}
}
标签:Type,void,笔记,class,泛型,ParameterizedType,type,public 来源: https://www.cnblogs.com/greatLong/p/14540251.html
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