JAVA学习--反射其他操作

//1.获取运行时类的父类
    @Test
    public void test1(){
        Class clazz = Person.class;
        Class superClass = clazz.getSuperclass();
        System.out.println(superClass);
    }

    //2.获取带泛型的父类
    @Test
    public void test2(){
        Class clazz = Person.class;
        Type type1 = clazz.getGenericSuperclass();
        System.out.println(type1);
    }

    //3*.获取父类的泛型
    @Test
    public void test3(){
        Class clazz = Person.class;
        Type type1 = clazz.getGenericSuperclass();
        
        ParameterizedType param = (ParameterizedType)type1;
        Type[] ars = param.getActualTypeArguments();
        
        System.out.println(((Class)ars[0]).getName());
    }
    

    //4.获取实现的接口
    @Test
    public void test4(){
        Class clazz = Person.class;
        Class[] interfaces = clazz.getInterfaces();
        for(Class i : interfaces){
            System.out.println(i);
        }
    }

    //5.获取所在的包
    @Test
    public void test5(){
        Class clazz = Person.class;
        Package pack = clazz.getPackage();
        System.out.println(pack);
    }

    //6.获取注解
    @Test
    public void test6(){
        Class clazz = Person.class;
        Annotation[] anns = clazz.getAnnotations();
        for(Annotation a : anns){
            System.out.println(a);
        }
    }

@MyAnnotation(value = "atguigu")
public class Person extends Creature<String> implements Comparable,MyInterface{
    public String name;
    private int age;
    int id;
    //创建类时，尽量保留一个空参的构造器。
    public Person() {
        super();
//        System.out.println("今天天气很闷热");
    }
    public Person(String name) {
        super();
        this.name = name;
    }
    private Person(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @MyAnnotation(value = "abc123")
    public void show(){
        System.out.println("我是一个人！");
    }
    
    private Integer display(String nation,Integer i) throws Exception{
        System.out.println("我的国籍是：" + nation);
        return i;
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + "]";
    }
    @Override
    public int compareTo(Object o) {
        // TODO Auto-generated method stub
        return 0;
    }
    
    public static void info(){
        System.out.println("中国人！");
    }
    
    class Bird{
        
    }

import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.LOCAL_VARIABLE;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE;

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

@Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE})
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
    String value();
}

public class Creature<T>{
    public double weight;
    
    public void breath(){
        System.out.println("呼吸！");
    }
}

 import java.io.Serializable; 2 3 public interface MyInterface extends Serializable{ 4 5 }