Java的反射机制

package com.lovo.exercise02;
/**
*牌类
*/
public class Card {

    private int playerNumber;//玩家人数
    private int cardNumber;//每个人的牌的张数
    private String[] huase = { "红桃", "黑桃", "方块", "梅花" };
    private String[] paivalue = { "A", "2", "3", "4", "5", "6", "7", "8", "9",
            "10", "J", "Q", "K" };
    private List<String> cards;//代表52张牌
/**
*带两个参的构造器
*/
    public Card(int playerNumber, int cardNumber) {
        super();
        this.playerNumber = playerNumber;
        this.cardNumber = cardNumber;
        cards = new ArrayList<String>();
        for (String hs : huase) {
            for (String pv : paivalue) {
                cards.add(hs + pv);
            }
        }
    }
    /**
     *获取牌的张数
     */
    public List<String> getCards(){
        return this.cards;
    }
/**
*洗牌
*/
    public void xipai(){
        Collections.shuffle(cards);
    }
  /**
   *发牌
   */
  
    public void fapai(){
        System.out.println("牌：" + cards.size());
        List<String> subList = cards.subList(0, cardNumber);
        for (String card : subList) {
            System.out.println(card);
        }
        subList.clear();
    }
}

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

/**
*测试类
*/
public class Test {

    public static void main(String[] args) throws Exception {
        // 加载com.lovo.exercise02.Card
        Class clazz = Class.forName("com.lovo.exercise02.Card");
        // System.out.println(clazz.getName());
        // System.out.println(clazz.getPackage());
        
        // 创建对象
//      Object obj = clazz.newInstance(); // 调用无参构造方法创建对象
        Constructor constructor = clazz.getConstructor(int.class, int.class);//调用有参构造方法
        Object obj = constructor.newInstance(3, 17);
        
        // 调用方法 xipai fapai
//        Method xipai = clazz.getMethod("xipai");
//        xipai.invoke(obj);
//        Method fapai = clazz.getMethod("fapai");
//        fapai.invoke(obj);
        Method display = clazz.getMethod("display", int.class, String.class);
        Object result = display.invoke(obj, 5, "abc");
        System.out.println(result);

        // 获取构造器
        // Constructor[] constructors = clazz.getDeclaredConstructors();
        // for (Constructor constructor : constructors) {
        // System.out.print(constructor.getName() + "(");
        // Class[] types = constructor.getParameterTypes();
        // for (Class class1 : types) {
        // System.out.print(class1.getName() + ",");
        // }
        // System.out.println(")");
        // }

        // 获取字段
        // Field[] fields = clazz.getDeclaredFields();
        // for (Field field : fields) {
        // System.out.println(field.getType().getName() + " " +
        // field.getName());
        // }

        // 获取public方法
        // Method[] methods = clazz.getMethods();
        // Method[] methods = clazz.getDeclaredMethods();
        // for (Method method : methods) {
        // System.out.print(Modifier.toString(method.getModifiers()) + " " +
        // method.getReturnType().getName() + " " + method.getName() + "(");
        // Class[] parameterTypes = method.getParameterTypes();
        // for (Class class1 : parameterTypes) {
        // System.out.print(class1.getName() + ",");
        // }
        // System.out.println(")");
        // }
    }
}