RTTI-CLASS

 1 package com.xt.test;
 2 
 3 interface Test1Interface {
 4 
 5 }
 6 
 7 interface Test2Interface {
 8 
 9 }
10 
11 class Test1 implements Test1Interface, Test2Interface {
12     static {
13         System.out.println("Test1--Class");
14     }
15 
16     public void print() {
17         System.out.println("print111!");
18     }
19 }
20 
21 public class ClassTest {
22     public static void main(String[] args) {
23         try {
24             Class<?> c = Class.forName("com.xt.test.Test1");
25             Test1 cc = (Test1) c.newInstance();
26             cc.print();
27             System.out.println("isInterface:" + c.isInterface());
28             // 打印类加载器的路径
29             System.out.println("ClassLoader->Path:"
30                     + c.getClassLoader().getResource("").getPath());
31             // 打印class文件的路径
32             System.out.println("Class->Path:" + c.getResource("").getPath());
33             // 含包名的类名
34             System.out.println("CanonicalName:" + c.getCanonicalName());
35             System.out.println("----------------------");
36             // 实现的接口
37             for (Class<?> cla : c.getInterfaces()) {
38                 System.out.println("Class->Path:"
39                         + cla.getResource("").getPath());
40                 System.out.println("isInterface:" + cla.isInterface());
41             }
42             // 得到父类，打印父类的名字
43             Class<?> spuerClass = c.getSuperclass();
44             System.out.println("superClassName:" + spuerClass.getName());
45             System.out.println("----------------------");
46             // Class.cast用法
47             Number n = new Integer(5);
48             Class<Integer> i = Integer.class;
49             Integer ii = i.cast(n);
50             System.out.println(ii);
51         } catch (ClassNotFoundException e) {
52             // TODO Auto-generated catch block
53             e.printStackTrace();
54         } catch (InstantiationException e) {
55             // TODO Auto-generated catch block
56             e.printStackTrace();
57         } catch (IllegalAccessException e) {
58             // TODO Auto-generated catch block
59             e.printStackTrace();
60         }
61     }
62 }

类字面常量XXX.class比Class.forName("")更安全，更效率,注意，使用.class来创建对Class对象的引用的时候不会自动初始化该Class对象.