|NO.Z.00124|——————————|BigDataEnd|——|Java&反射机制.V04|——|Java.v04|获取其它结构|实现|

一、获取其它结构的实现：获取其它结构信息

方法声明	功能介绍
Package getPackage()	获取所在的包信息
Class<? super T> getSuperclass()	获取继承的父类信息
Class<?>[] getInterfaces()	获取实现的所有接口
Annotation[] getAnnotations()	获取注解信息
Type[] getGenericInterfaces()	获取泛型信息

二、编程代码

package com.yanqi.task20;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
}

package com.yanqi.task20;

import java.io.Serializable;

@MyAnnotation
public class Student<T, E> extends Person implements Comparable, Serializable {

    @Override
    public int compareTo(Object o) {
        return 0;
    }
}

package com.yanqi.task20;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

public class StudentTest {

    public static void main(String[] args) throws Exception {

        // 获取Student类型的Class对象
        Class c1 = Class.forName("com.yanqi.task20.Student");
        System.out.println("获取到的包信息是：" + c1.getPackage());
        System.out.println("获取到的父类信息是：" + c1.getSuperclass());

        System.out.println("-------------------------------------------------");
        System.out.println("获取到的接口信息是：");
        Class[] interfaces = c1.getInterfaces();
        for (Class ct : interfaces) {
            System.out.print(ct + " ");
        }
        System.out.println();

        System.out.println("-------------------------------------------------");
        System.out.println("获取到的注解信息是：");
        Annotation[] annotations = c1.getAnnotations();
        for (Annotation at : annotations) {
            System.out.print(at + " ");
        }
        System.out.println();

        System.out.println("-------------------------------------------------");
        System.out.println("获取到的泛型信息是：");
        Type[] genericInterfaces = c1.getGenericInterfaces();
        for (Type tt : genericInterfaces) {
            System.out.print(tt + " ");
        }
        System.out.println();
    }
}

三、编译打印

D:\JAVA\jdk-11.0.2\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=53684:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath E:\NO.Z.10000——javaproject\NO.H.00001.javase\javase\out\production\javase com.yanqi.task20.StudentTest
获取到的包信息是：package com.yanqi.task20
获取到的父类信息是：class com.yanqi.task20.Person
-------------------------------------------------
获取到的接口信息是：
interface java.lang.Comparable interface java.io.Serializable 
-------------------------------------------------
获取到的注解信息是：
@com.yanqi.task20.MyAnnotation() 
-------------------------------------------------
获取到的泛型信息是：
interface java.lang.Comparable interface java.io.Serializable 

Process finished with exit code 0

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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