RTTI-CLASS

package com.xt.test;

interface Test1Interface {

}

interface Test2Interface {

}

class Test1 implements Test1Interface, Test2Interface {
    static {
        System.out.println("Test1--Class");
    }

    public void print() {
        System.out.println("print111!");
    }
}

public class ClassTest {
    public static void main(String[] args) {
        try {
            Class<?> c = Class.forName("com.xt.test.Test1");
            Test1 cc = (Test1) c.newInstance();
            cc.print();
            System.out.println("isInterface:" + c.isInterface());
            // 打印类加载器的路径
            System.out.println("ClassLoader->Path:"
                    + c.getClassLoader().getResource("").getPath());
            // 打印class文件的路径
            System.out.println("Class->Path:" + c.getResource("").getPath());
            // 含包名的类名
            System.out.println("CanonicalName:" + c.getCanonicalName());
            System.out.println("----------------------");
            // 实现的接口
            for (Class<?> cla : c.getInterfaces()) {
                System.out.println("Class->Path:"
                        + cla.getResource("").getPath());
                System.out.println("isInterface:" + cla.isInterface());
            }
            // 得到父类，打印父类的名字
            Class<?> spuerClass = c.getSuperclass();
            System.out.println("superClassName:" + spuerClass.getName());
            System.out.println("----------------------");
            // Class.cast用法
            Number n = new Integer(5);
            Class<Integer> i = Integer.class;
            Integer ii = i.cast(n);
            System.out.println(ii);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InstantiationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

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.