1、Class.forName("类名");
例子:public class Demo{}
Class clazz = Class.forName("Demo");
2、类名.class 此种方式不会加载类
例子:public class Demo{}
Class clazz = Demo.class;
3、Object.getClass();
例子:public class Demo{}
Demo demo = new Demo();
Class clazz = demo .getClass();