java利用反射方式获取对象的成员变量、构造方法、普通方法，并进行基本的操作

客官°小女子只卖身不卖艺 2021-12-03 11:09 186阅读 0赞

1.反射类Person类

/**
     * 反射类Person
     * @author wukefan
     *
     */
    public class Person {
    	private String name ="吴某某";
    	public Integer age = 21;
    	public Person() {
    		
    	}
    	public Person(String name,Integer age) {
    		this.name = name;
    		this.age = age;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public void getInfo() {
    		System.out.println(name+","+age);
    	}
    	public void getInfo(String phone) {
    		System.out.println(name+","+age+",电话："+phone);
    	}
    	@Override
    	public String toString() {
    		return "Person [name=" + name + ", age=" + age + "]";
    	}
    	
    }

2.测试代码：

package reflecttest;
    
    import java.lang.reflect.Constructor;
    import java.lang.reflect.Field;
    import java.lang.reflect.Method;
    
    public class Test {
    
    	public static void main(String[] args) throws Exception {
    		// TODO Auto-generated method stub
    		//获取Class对象
    		Class<Person> person = Person.class;
    		//获取Person对象的属性
    		Field[] fields = person.getFields();//获取public属性
    		for (Field field : fields) {			
    			System.out.println(field.get(new Person()));
    		}
    		fields = person.getDeclaredFields();//获取所有属性
    		for (Field field : fields) {
    			field.setAccessible(true);//private的需要执行此方法
    			System.out.println(field.get(new Person()));
    		}
    		Field field = person.getDeclaredField("age");
    		System.out.println(field.get(new Person()));
    		
    		//获取Person对象的构造方法
    		Constructor<Person> constructor = person.getConstructor(String.class,Integer.class);//有参构造方法
    		System.out.println(constructor);
    		Person test = constructor.newInstance("111",11);//初始化
    		System.out.println(test.toString());	
    		test = person.newInstance();//无参构造方法
    		System.out.println(test.toString());
    		
    		//获取Person对象的普通方法
    		Method[] methods = person.getMethods();//获取public修饰的普通方法
    		methods = person.getDeclaredMethods();//获取所有的普通方法
    		Method method = person.getMethod("getInfo");//获取指定无参方法
    		method.invoke(new Person());//执行方法
    		method = person.getMethod("getInfo",String.class);//获取指定有参方法
    		method.invoke(new Person(),"110");//执行方法
    	}
    
    }

3.输出如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3Mjg0Nzk4_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3Mjg0Nzk4_size_16_color_FFFFFF_t_70]: /images/20211203/d9d86bb2f0e04062a41281359b977ead.png