反射——获取成员方法

约定不等于承诺〃 2023-08-17 16:08 130阅读 0赞

![1392562-20190821204654745-1047986953.png][]

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：

![1392562-20190821205755626-1087514034.png][]

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);
        }
        }
    }

转载于:https://www.cnblogs.com/zhai1997/p/11391275.html

[1392562-20190821204654745-1047986953.png]: /images/20230810/8173694d16474d8c8e1f0a600550b7c8.png
[1392562-20190821205755626-1087514034.png]: /images/20230810/6ddd4f2100f74e64838b5d8e4a2d1fb6.png