mcc/Test.java 

package mcc;

 

//撲克類（一副撲克） 

 class Poker
{
	//內部類Card
	public class Card
	{
		private String suite; // 花色
		private int face; // 點數

		public Card(String suite, int face)
		{
			this.suite = suite;
			this.face = face;
		}

		@Override
		public String toString()
		{
			String faceStr = "";
			switch (face)
			{
			case 1:
				faceStr = "A";
				break;
			case 11:
				faceStr = "J";
				break;
			case 12:
				faceStr = "Q";
				break;
			case 13:
				faceStr = "K";
				break;
			default:
				faceStr = String.valueOf(face);
			}
			return suite + faceStr;
		}
	}

	//Poker類 成員
	private static String[] suites = { "黑桃", "紅桃", "梅花", "方塊" };
	private static int[] faces = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
	private Card[] cards;

	//構造器	 
	public Poker()
	{
		//構造52個Card物件 存放在cards 陣列中
		cards = new Card[52];
		for (int i = 0; i < suites.length; i++)
		{
			for (int j = 0; j < faces.length; j++)
			{
				cards[i * 13 + j] = new Card(suites[i], faces[j]);
			}
		}
	}

	//洗牌 （隨機亂序）	 
	public void shuffle()
	{
		int len = cards.length;
		for (int i = 0; i < len; i++)
		{
			int index = (int) (Math.random() * len);
			Card temp = cards[index];
			cards[index] = cards[i];
			cards[i] = temp;
		}
	}

	//獲取一個Card 物件 	
	public Card getCard(int index)
	{
		return cards[index];
	}
	
}

public class Test
{
	public static void main(String[] args)
	{

        Poker poker = new Poker();  
        poker.shuffle();            // 洗牌  
        Poker.Card c1 = poker.getCard(0);  // 發第一張牌  
        
        // 對於非靜態內部類Card  
        // 只有通過其外部類Poker物件才能建立Card物件  
        Poker.Card c2 = poker.new Card("紅心", 1);    // 自己建立一張牌  
         
        System.out.println(c1);     // 洗牌後的第一張  
        System.out.println(c2);     // 列印: 紅心A  

	}

}