Class.getDeclaredFields()和Class.getFields()的区别。 Class.getMethods()和Class.getDeclaredMethods()的区别。

package www.cn.extend;

/** Animal
 * 2019/07/04
 * @author Administrator
 *
 */
public class Animal {

    public String mName;
    public String mSex;
    private String mSecret = "I hava a secret but I can't tell you know";

    public String getSecret() {
        return mSecret;
    } 

    private void privateMethod() {
        System.out.println("just a privateMethod");
    }
}

package www.cn.extend;

/**
 * Dog
 * @author Administrator
 *
 */
public class Dog extends Animal{
    private String mJob;
    public String mSkill;
    protected String mDrive;
    int mAge;

    void keepFit(){
        System.out.println(Dog.class.getSimpleName()+" to keepFit");
    }

    private void sooEsad(){
        System.out.println("asdf");
    }
}
 

package www.cn.extend;

import java.lang.reflect.Method;

public class Test {

    public static void main(String[] args){

        /**.class.getFields();
         * 返回父类和子类中公共属性的Field数组。
         */
//        Field[] fields = Dog.class.getFields();
//        for (Field field:fields){
//            System.out.println("this is a field from "+Dog.class.getSimpleName() +" : "+field);
//        }

        /**.class.getDeclaredFields();
         * 返回子类中所有访问权限的属性。
         */
//        Field[] declaredFields = Dog.class.getDeclaredFields();
//        for (Field field:declaredFields){
//            System.out.println("this is a declaredFields from "+Dog.class.getSimpleName() +" : "+field);
//        }

        /**.class.getMethods();
         * 返回父类的公共方法
         */
//        Method[] methods = Dog.class.getMethods();
//        for (Method method:methods){
//            System.out.println("this is a methods from "+Dog.class.getSimpleName() +" : "+method);
//        }

        /**.class.getDeclaredMethods();
         * 返回子类所有权限的方法。
         */
        Method[] declaredMethods = Dog.class.getDeclaredMethods();
        for (Method method:declaredMethods){
            System.out.println(declaredMethods[0].getName());
            System.out.println("this is a declaredMethods from "+Dog.class.getSimpleName() +" : "+method);
        }

    }

}