反射——获取成员方法

public Method getMethod(String name, Class<?>... parameterTypes) 获取Public修饰的一个方法

public Method getDeclaredMethod(String name, Class<?>... parameterTypes) 获取所有权限的一个方法

public Method[] getMethods() 本类与父类中所有public 修饰的方法所有方法

public Method[] getDeclaredMethods() 获取本类中所有的方法

package pers.reflect.person;

public class Person {
private String name;
private int age;
public String hobby;
public String height;
protected String sex;
String address;

public Person(){
    
}
public Person(String name,int age){
    this.name=name;
    this.age=age;
}

protected  void sports() {
    System.out.println("我爱运动");
}
private  void sport() {
    System.out.println("我不爱运动");
}
public String toString() {
    return "Person [name=" + name + ", age=" + age + ", hobby=" + hobby
            + ", height=" + height + ", sex=" + sex + ", address=" + address
            + "]";
}
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;
}
public void study(String name){
    System.out.println(name+"爱学习");
}
}

（1）获取公共的空参的成员方法：

package pers.reflect.method;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.rmi.StubNotFoundException;

import pers.reflect.person.Person;

public class reflectDemo {
    public static void main(String[] args) throws SecurityException,
            NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        Class c = Person.class;
        Method study_method = c.getMethod("study");
        Person p = new Person();
        study_method.invoke(p);
    }
}

（2）获取公共的带参数的成员方法：

package pers.reflect.method;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import pers.reflect.person.Person;

public class reflectDemo {
    public static void main(String[] args) throws SecurityException,
            NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        Class c = Person.class;
        Method study_method1 = c.getMethod("study",String.class);
        Person p = new Person();
        study_method1.invoke(p,"Tom");
    }
}

（3）获取所有的公共的方法：

package pers.reflect.method;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import pers.reflect.person.Person;

public class reflectDemo {
    public static void main(String[] args) throws SecurityException,
            NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        Class c = Person.class;
        Method[] methods = c.getMethods();
        for (Method method:methods){
            System.out.println(method);
        }
    }
}

（4）获取方法名字：

package pers.reflect.method;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import pers.reflect.person.Person;

public class reflectDemo {
    public static void main(String[] args) throws SecurityException,
            NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        Class c = Person.class;
        Method[] methods = c.getMethods();
    for(Method method:methods){
        System.out.println(method.getName());
    }
    }
}

（5）获取所有的方法（忽略权限修饰符）：

package pers.reflect.method;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import pers.reflect.person.Person;

public class reflectDemo {
    public static void main(String[] args) throws SecurityException,
            NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        Class c = Person.class;
        Method[] methods = c.getDeclaredMethods();
        
    for(Method method:methods){
        method.setAccessible(true);
        System.out.println(method);
    }
    }
}

来源：https://www.cnblogs.com/zhai1997/p/11391275.html

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