java获取一个类或者一个对象中的所有方法和属性

• 1.获取 类 中的所有方法和属性

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class Main {
    public static void main(String[] args) {
        Method[]  methods = String.class.getDeclaredMethods();
        Field[] Fields = String.class.getDeclaredFields();
        for (Method method:methods) {
            System.out.print(method.getName());
            System.out.print("-");
            System.out.println(method.getGenericReturnType().getTypeName());
        }
        System.out.println("==========================================");
        for (Field field:Fields) {
            System.out.println(field.getName());
            System.out.print("-");
            System.out.println(field.getGenericType().getTypeName());
        } 
    }
}

• 2.获取 对象 中的所有方法和属性

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class Main {
    public static void main(String[] args) {
        String x = "123";
        Method[]  methods = x.getClass().getDeclaredMethods();
        Field[] Fields = x.getClass().getDeclaredFields();
        for (Method method:methods) {
            System.out.print(method.getName());
            System.out.print("-");
            System.out.println(method.getGenericReturnType().getTypeName());
        }
        System.out.println("==========================================");
        for (Field field:Fields) {
            System.out.println(field.getName());
            System.out.print("-");
            System.out.println(field.getGenericType().getTypeName());
        }
    }
}