使用反射调用方法-蒲公英云

使用反射调用方法

定义一个标准的JavaBean，名叫Person，包含属性name、age。使用反射的方式创建一个实例、调用构造函数初始化name、age，使用反射方式调用setName方法对名称进行设置，不使用setAge方法直接使用反射方式对age赋值。

package com.alex.question2;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class ReflectTest {
    public static void main(String[] args) {
            try {
                Person person = Person.class.getConstructor(String.class,int.class).newInstance("alex",25);
                System.out.println("name:"+person.getName()+"\nage:"+person.getAge());
                Method setNameMethod=Person.class.getMethod("setName", String.class);
                setNameMethod.invoke(person, "zhuang");
                Method setAgeMethod=Person.class.getMethod("setAge", int.class);
                setAgeMethod.invoke(person, 23);
                System.out.println("name:"+person.getName()+"\nage:"+person.getAge());
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InstantiationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }
}
package com.alex.question2;
public class Person {
    private String name;
    private int age;
    public String getName() {
        return name;
    }
    public int getAge() {
        return age;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Person(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public Person(){
    }
}