Java注解与反射（四）

package refection;
 import java.lang.annotation.ElementType;
 // 所有类型的Class
 @SuppressWarnings("all")
 public class Test03 {
     public static void main(String[] args){
         Class c1 = Object.class;
         Class c2 = Comparable.class ;
         Class c3 = String[].class;
         Class c4 = int[][].class ;
         Class c5 = Override.class ;
         Class c6 = ElementType.class ;
         Class c7 = Integer.class ;
         Class c8 = void.class ;
         Class c9 = Class.class ;
         System.out.println(c1);
         System.out.println(c2);
         System.out.println(c3);
         System.out.println(c4);
         System.out.println(c5);
         System.out.println(c6);
         System.out.println(c7);
         System.out.println(c8);
         System.out.println(c9);
         System.out.println("————————————————————————————————————————————");
         // 一个类只有一个Class对象
         // 只要元素类型和维度一样，那么两个数组就是一个对象
         // 需求：验证上一行的文字的真实性
         int []a = new int [20] ;
         int []b = new int [200] ;
         System.out.println(a.getClass().hashCode());
         System.out.println(b.getClass().hashCode());
     }
 }

package refection;
 public class Test04 {
     @SuppressWarnings("all")
     public static void main(String[] args){
         A a = new A();
         System.out.println(A.M);
         System.out.println(a.M);
     }
 }
 class A{
     static {
         System.out.println("A类被加载");
     }
     static final int M = 100 ;
 }