JAVA学习--反射其他操作

1 //1.获取运行时类的父类
2     @Test
3     public void test1(){
4         Class clazz = Person.class;
5         Class superClass = clazz.getSuperclass();
6         System.out.println(superClass);
7     }

1     //2.获取带泛型的父类
2     @Test
3     public void test2(){
4         Class clazz = Person.class;
5         Type type1 = clazz.getGenericSuperclass();
6         System.out.println(type1);
7     }

 1     //3*.获取父类的泛型
 2     @Test
 3     public void test3(){
 4         Class clazz = Person.class;
 5         Type type1 = clazz.getGenericSuperclass();
 6         
 7         ParameterizedType param = (ParameterizedType)type1;
 8         Type[] ars = param.getActualTypeArguments();
 9         
10         System.out.println(((Class)ars[0]).getName());
11     }
12     

1     //4.获取实现的接口
2     @Test
3     public void test4(){
4         Class clazz = Person.class;
5         Class[] interfaces = clazz.getInterfaces();
6         for(Class i : interfaces){
7             System.out.println(i);
8         }
9     }

1     //5.获取所在的包
2     @Test
3     public void test5(){
4         Class clazz = Person.class;
5         Package pack = clazz.getPackage();
6         System.out.println(pack);
7     }

1     //6.获取注解
2     @Test
3     public void test6(){
4         Class clazz = Person.class;
5         Annotation[] anns = clazz.getAnnotations();
6         for(Annotation a : anns){
7             System.out.println(a);
8         }
9     }

 1 @MyAnnotation(value = "atguigu")
 2 public class Person extends Creature<String> implements Comparable,MyInterface{
 3     public String name;
 4     private int age;
 5     int id;
 6     //创建类时，尽量保留一个空参的构造器。
 7     public Person() {
 8         super();
 9 //        System.out.println("今天天气很闷热");
10     }
11     public Person(String name) {
12         super();
13         this.name = name;
14     }
15     private Person(String name, int age) {
16         super();
17         this.name = name;
18         this.age = age;
19     }
20     public String getName() {
21         return name;
22     }
23     public void setName(String name) {
24         this.name = name;
25     }
26     public int getAge() {
27         return age;
28     }
29     public void setAge(int age) {
30         this.age = age;
31     }
32     
33     public int getId() {
34         return id;
35     }
36     public void setId(int id) {
37         this.id = id;
38     }
39     @MyAnnotation(value = "abc123")
40     public void show(){
41         System.out.println("我是一个人！");
42     }
43     
44     private Integer display(String nation,Integer i) throws Exception{
45         System.out.println("我的国籍是：" + nation);
46         return i;
47     }
48     @Override
49     public String toString() {
50         return "Person [name=" + name + ", age=" + age + "]";
51     }
52     @Override
53     public int compareTo(Object o) {
54         // TODO Auto-generated method stub
55         return 0;
56     }
57     
58     public static void info(){
59         System.out.println("中国人！");
60     }
61     
62     class Bird{
63         
64     }

 1 import static java.lang.annotation.ElementType.CONSTRUCTOR;
 2 import static java.lang.annotation.ElementType.FIELD;
 3 import static java.lang.annotation.ElementType.LOCAL_VARIABLE;
 4 import static java.lang.annotation.ElementType.METHOD;
 5 import static java.lang.annotation.ElementType.PARAMETER;
 6 import static java.lang.annotation.ElementType.TYPE;
 7 
 8 import java.lang.annotation.Retention;
 9 import java.lang.annotation.RetentionPolicy;
10 import java.lang.annotation.Target;
11 
12 @Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE})
13 @Retention(RetentionPolicy.RUNTIME)
14 public @interface MyAnnotation {
15     String value();
16 }

1 public class Creature<T>{
2     public double weight;
3     
4     public void breath(){
5         System.out.println("呼吸！");
6     }
7 }