package demo4;import java.io.Serializable;import javax.annotation.Resource;public  class UserInfo  implements Serializable,Runnable{    private static final long serialVersionUID = 1L;    private  String name="张三";    private int age;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }         @Resource    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String say(String text){        return "你好，我叫小张！"+text;    }    @Override    public void run() {    }    public UserInfo(String name, int age) {        System.out.println("带参构造已执行");        this.name = name;        this.age = age;    }    public UserInfo() {    }}

package demo4;import java.lang.annotation.Annotation;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.lang.reflect.Modifier;import java.lang.reflect.TypeVariable;import org.junit.After;import org.junit.Before;import org.junit.Test;public class MyTest {	public static void main(String[] args) throws Exception {		 //No.1        Class forName = Class.forName("demo4.UserInfo");		//        //No.2		//        Class clazz=UserInfo.class;		//        //No.3		//        Class class1 = new UserInfo().getClass();         getPackageAndClassName(forName);         System.out.println("-----------------------------------");         getClassFields(forName);         System.out.println("-----------------------------------");         getSuperClassAndInterface(forName);         System.out.println("-----------------------------------");         getClassMethod(forName);         System.out.println("-----------------------------------");         getClassConstructor(forName);         System.out.println("-----------------------------------");         getClassAnnotion(forName);	}		//包名和类名同时获取	public static void getPackageAndClassName(Class clazz){		    Package pack = clazz.getPackage();		    System.out.println("包名为:"+pack.getName());		    System.out.println("类的全名为:"+clazz.getName());		    System.out.println("类名:"+clazz.getSimpleName());	}	//获取类中的字段	public static void getClassFields(Class clazz) throws Exception{		   //1、getDeclaredFields() 只能获取当前类的字段		            Field[] declaredFields = clazz.getDeclaredFields();		            //不知道类名的情况下也可以创建类的对象		            Object obj = clazz.newInstance();		            for (Field field : declaredFields) {		            	  field.setAccessible(true);						  System.out.println(field.getName()); 						  //取出字段保存的值						  System.out.println(field.get(obj));					}		            Field field = clazz.getDeclaredField("age");		            field.setAccessible(true);		            //给字段赋值		            field.set(obj, 12);		           System.out.println("赋值成功！值为:"+ field.get(obj));		           //获取age字段的数据类型		           Class
      type = field.getType();		           System.out.println("age字段的数据类型是:"+type.getName());		           //获取访问修饰符		           int code = field.getModifiers();		           System.out.println("该字段的访问修饰符是:"+Modifier.toString(code));	  }	    //3:获取类的父类以及实现的接口		public static void getSuperClassAndInterface(Class clazz){			    System.out.println("该类的父类是:"+clazz.getSuperclass().getName());			    System.out.println("该类实现的接口有:");			    Class[] clazzs = clazz.getInterfaces();			    for (Class class1 : clazzs) {					System.out.println("接口名称:"+class1.getName());				}		}	    //4:获取类中的方法		public static void getClassMethod(Class clazz) throws Exception{			   //可以获取从父类继承过来的方法			    Method[] methods = clazz.getMethods();			    System.out.println(methods.length);			    for (Method method : methods) {					System.out.println("类和父类的方法有:"+method.getName());				}			    System.out.println("--------------------------------------------------------");			    //获取当前类的方法			    Method[] declaredMethods = clazz.getDeclaredMethods();			    for (Method method : declaredMethods) {					   System.out.println("该类的方法有:"+method.getName());				}			    //获取单个方法			    Method method = clazz.getDeclaredMethod("say",String.class);			    //获取方法的返回值			    Class  clazzs = method.getReturnType();			    System.out.println("该方法的返回值是"+clazzs.getName());			    //获取方法的形参类型			    Class[] params = method.getParameterTypes();			    for (Class class1 : params) {					System.out.println("形参有:"+class1.getName());				}			    //不知道类名的情况下也可以创建类的对象	            Object obj = clazz.newInstance();	            //invoke让method对象执行			    Object obj1= method.invoke(obj, "我是狗");			    System.out.println("方法执行后的结果是:"+obj1);		}				//5:获取构造		public static void getClassConstructor(Class clazz) throws Exception{			//获取所有构造器			  Constructor[] constructors = clazz.getConstructors();			  for (Constructor constructor : constructors) {				    System.out.println(constructor.getName());			  }			  //获取单个构造器			  Constructor constructor = clazz.getConstructor(String.class,int.class);			  //执行构造器,返回类的实例			  Object obj = constructor.newInstance("呵呵",12);		}	   //6：获取注解		 public static void getClassAnnotion(Class clazz) throws Exception{			       Method method = clazz.getDeclaredMethod("getAge");			       Annotation[] annotations = method.getAnnotations();			       for (Annotation annotation : annotations) {					  System.out.println("该方法的注解有："+annotation.toString());				}		 }}