反射获取方法

Method

Class.getMethod(String, Class...) 和 Class.getDeclaredMethod(String, Class...)方法可以获取类中的指定方法,调用invoke(Object, Object...)可以调用该方法,Class.getMethod("eat") invoke(obj) Class.getMethod("eat",int.class) invoke(obj,10)

 

public class Demo_Method {

    /**
     * Class.getMethod(String, Class...) 和 Class.getDeclaredMethod(String,
     * Class...)方法可以获取类中的指定方法,调用invoke(Object,
     * Object...)可以调用该方法,Class.getMethod("eat") invoke(obj)
     * Class.getMethod("eat",int.class) invoke(obj,10)
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        Class clazz = Class.forName("com.loaderman.bean.Person");
        Constructor c = clazz.getConstructor(String.class,int.class);//获取有参构造
        Person p = (Person) c.newInstance("张三",23);     //通过有参构造创建对象

        Method m = clazz.getMethod("eat");         //获取eat方法
        m.invoke(p);

        Method m2 = clazz.getMethod("eat", int.class);  //获取有参的eat方法
        m2.invoke(p, 10);
    }

}

 

 

package com.loaderman.bean;

public class Person {
    private String name;
    private int age;
    public Person() {
        super();

    }
    public Person(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + age;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (this.getClass() != obj.getClass())    //判断调用对象和传入对象的字节码文件是否是同一个字节码文件
            return false;
        Person other = (Person) obj;
        if (age != other.age)
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + "]";
    }

    public void eat() {
        System.out.println("今天吃了一顿金钱豹");
    }

    public void eat(int num) {
        System.out.println("今天吃了" + num + "顿金钱豹");
    }
}