面向对象编程练习

1、编程题

设计一个用户类User，类中的变量有用户名、密码和记录用户数量的变量，定义3个构造方法：无参的、为用户名赋值的、为用户名和密码赋值的，还有获取和设置密码的方法和返回类信息的方法。

package com.lvlei;

public class User {
	   private String name;
	    private String password;
	    private static int count;
	    public User() {
	        count++;
	    }
	    public User(String name) {
	        this.name=name;
	        count++;
	    }
	    public User(String name,String password) {
	        this.name=name;
	        this.password=password;
	        count++;
	    }
	    public String getName() {
	        return name;
	    }
	    public void setname() {
	        this.name=name;
	    }
	    public String getPassword(String name){
	        return password;
	    }
	    public void setPassword() {
	        this.password=password;
	    }
	    public void print(){
	        System.out.println("用户名："+name+"\t"+"密码："+password);
	    }
	    public void count() {
	        System.out.println("用户个数"+(count-1));
	    }

}

　　

package com.lvlei;

public class Test02 {
	public static void main(String[] args) {
	    User user1=new User("李四","123456");
	    user1.print();
	    User user2=new User("张三","542189");
	    user2.print();
	    User user3=new User("吕磊","252559");
	    user3.print();
	    new User().count();
	}
}

　　

 

2、编程题

设计一副牌Poker的外部类和一张牌Card的内部类。

（1）Poker类中定义私有成员花色数组、点数数组以及一副牌的数组属性，提供构造方法（创建并初始化一副牌的数组）、随机洗牌方法shuffle（Math.random()获取[0,1)的随机数；获取[n,m)的随机数公式为Math.random()*(m-n)+n）和发牌方法deal。

（2）Card类中定义花色和点数属性，提供打印信息方法。

（3）定义测试类并在main()方法中创建一副牌Poker对象，并调用shufle()进行洗牌，调用deal()进行发牌。

 

package lvlei;

class Poker {

        
            public class Card
            {
                private String suite; 
                private int face; 
         
                public Card(String suite, int face)
                {
                    this.suite = suite;
                    this.face = face;
                }
                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;
                }
            }
         
            private static String[] suites = { "黑桃", "红桃", "梅花", "方块" };
            private static int[] faces = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
            private Card[] cards;
         
            public Poker()
            {
                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]);
                    }
                }
            }
         
             
            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;
                }
            }
         
            
            public Card getCard(int index)
            {
                return cards[index];
            }
            
        }

　

package lvlei;

public class dsd {
    public static void main(String[] args) {
        Poker poker=new Poker();
        poker.shuffle();
        Poker.Card c1 = poker.getCard(0);  
        Poker.Card c2 = poker.getCard(1);    
        System.out.println(c1);       
        System.out.println(c2);      
 
    }


}