Java反射

反射的使用方法
?

userSeriver接口

public interface UserService {

?? ?void add();

?? ?int delete(String id);

?? ?int update(String id,String name,String age);

?? ?int insert(String id,String age);
}
UserServiceImpl 实现类

public class UserServiceImpl implements UserService {

?? ?@Override
?? ?public void add() {
?? ??? ?System.out.println("add个啥，你啥也没传");
?? ?}

?? ?@Override
?? ?public int delete(String id) {
?? ??? ?System.out.println("id:"+id+"被删除了");
?? ??? ?return 0;
?? ?}

?? ?@Override
?? ?public int update(String id,String age) {
?? ??? ?System.out.println("id:"+id+"修改成功[name:"+name+"age:"+age+"]");
?? ??? ?return 1;
?? ?}

?? ?@Override
?? ?public int insert(String id,String age) {
?? ??? ?System.out.println("插入成功[id:"+id+"name:"+name+"age:"+age+"]");
?? ??? ?return 2;
?? ?}

}
MainTest测试类

public class MainTest { ?? ?public static void main(String[] args) {?? ??? ?try {?? ??? ??? ?Class<?> clazz1 = Class.forName("com.test.UserServiceImpl");?? ??? ??? ??? ??? ??? ?Method method1 = clazz1.getMethod("update",String.class,String.class);?? ??? ??? ?Object invoke1 = method1.invoke(clazz1.newInstance(),"id100","王大拿","51");?? ??? ??? ?System.out.println(invoke1);?? ??? ??? ??? ??? ??? ?Class<?> clazz2 = UserServiceImpl.class;?? ??? ??? ?for (Method method : clazz2.getMethods()) {?? ??? ??? ??? ?if (method.getName().equals("insert")) {?? ??? ??? ??? ??? ?Method thisMethod = clazz2.getMethod(method.getName(),method.getParameterTypes());?? ??? ??? ??? ??? ?Object obj = thisMethod.invoke(clazz2.newInstance(),"1","张大炮","28");?? ??? ??? ??? ??? ?System.out.println(obj);?? ??? ??? ??? ?}?? ??? ??? ?}?? ??? ??? ??? ??? ??? ?UserService user = new UserServiceImpl();?? ??? ??? ?Class<?> clazz3 = user.getClass();?? ??? ??? ?Method method3 = clazz3.getMethod("add");?? ??? ??? ?Object invoke3 = method3.invoke(clazz3.newInstance());?? ??? ??? ?System.out.println(invoke3);?? ??? ??? ??? ??? ?} catch (Exception e) {?? ??? ??? ?e.printStackTrace(http://www.my516.com);?? ??? ?}?? ?}}?---------------------