Java--反射Demo

1.利用反射实例化对象：

Person aPerson =new Person();
Class  class1  = aPerson.getClass();
try {	    		
Person	c1 = aPerson.getClass().newInstance();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 

 

2.利用反射拿到实例域的值
 

Person aPerson =new Person();
Class  class1  = aPerson.getClass();
try {	    		
Person	c1 = aPerson.getClass().newInstance();
Field field = class1.getDeclaredField("name");
field.setAccessible(true);
field.get(c1);
System.out.println(field.get(c1));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 

3.利用反射拿到方法

                Person aPerson =new Person();
	    	Class  class1  = aPerson.getClass();
	    	try {	    		
	    	Person	c1 = aPerson.getClass().newInstance();
	    	
                        Method aMethod  =Person.class.getDeclaredMethod("setAge",int.class);     	
			Method bMethod =Person.class.getDeclaredMethod("getAge");
	    	
			int age =(int)bMethod.invoke(c1);
			
			System.out.println(age);
			aMethod.invoke(c1,12);
			System.out.println(c1.getAge());
				    	
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}