java 实验2 类

　　共5道大题  最后一题为自动洗牌发牌系统

1) 编写一个类实现银行帐户的概念。包括的属性有：帐号、储户姓名、地址、存款余额，包括的方法有：存款、取款、查询、计算利息、累加利息等。

public class bank {
    private int id;
    private String name;
    private String address;
    private double money;
    public bank()
    {
        this.id = 0;
        this.name = "默认姓名";
        this.address = "默认地址";
        this.money = 0;
    }
    public String toString() {
        return "bank [id=" + id + ", name=" + name + ", address=" + address + ", money=" + money + "]";
    }
    public bank(int id, String name, String address, int money) {
        super();
        this.id = id;
        this.name = name;
        this.address = address;
        this.money = money;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public double getMoney() {
        return money;
    }
    public void setMoney(double money) {
        this.money = money;
    }
    /**
     * 存款
     */
    public void saving(int m,int y) {
        double a=getMoney();
        double tax=y*0.001*m;
        setMoney(getMoney()+m+tax);
        System.out.println("存款成功:"+a+"元  "+y+"年后--->"+getMoney()+"元");
    }
    /**
     * 取款
     */
    public void take(int m)
    {
        double a=getMoney();
        if(getMoney()<0)
        {
            System.out.println("余额不足取款失败");
        }
        setMoney(getMoney()-m);
        System.out.println("取款成功:"+a+"元--->"+getMoney()+"元");
    }
}

2）编写一个类实现桌子的概念，包括的属性有长、宽、高和颜色，包括的方法有：计算体积、显示桌子信息、设置桌子颜色及长宽高。

public class desk {
    private double length;
    private double width;
    private double height;
    private String color;

    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public double getLength() {
        return length;
    }
    public void setLength(double length) {
        this.length = length;
    }
    public double getWidth() {
        return width;
    }
    public void setWidth(double width) {
        this.width = width;
    }
    public double getHeight() {
        return height;
    }
    public void setHeight(double height) {
        this.height = height;
    }

    public desk(double length, double width, double height, String color) {
        super();
        this.length = length;
        this.width = width;
        this.height = height;
        this.color = color;
    }
    public double V() {
        return length*height*width;
    }
    @Override
    public String toString() {
        return "desk [length=" + length + ", width=" + width + ", height=" + height +", volume="+V()+ "]";
    }
}

3）编写一个类实现一个圆，属性包括圆心、半径，方法主要包括显示的圆的信息、求面积等。圆心是Point类的对象，有两个属性x,y，代表横纵坐标。

public class circle {
    private double r;
    private double x;
    private double y;
    public double getR() {
        return r;
    }
    public void setR(double r) {
        this.r = r;
    }
    publ4ic double getX() {
        return x;
    }
    public void setX(double x) {
        this.x = x;
    }
    public double getY() {
        return y;
    }
    public void setY(double y) {
        this.y = y;
    }
    public circle(point p, double r) {
        this.r = r;
        this.x = p.getX();
        this.y = p.getY();
    }
    public  double area() {
        return (double)((int)(Math.PI*Math.pow(r, 2)*100))/100;    //保留两位小数
    }
    @Override
    public String toString() {
        return "circle [r=" + r + ", x=" + x + ", y=" + y + ", area=" + area() + "]";
    }
}
圆心类
public class point {
    private int x;
    private int y;
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    public point(int x, int y) {
        this.x = x;
        this.y = y;
    }
    public point() {
        this.x=0;
        this.y=0;
    }
}

4)设计一个扑克洗牌算法。将52张牌（不包括大、小王）用对象的形式表示，每张牌包括花色和大小。大小按如下序号排列：（2、3、4、5、6、7、8、9、10、J、Q、K、A）， 花色为： ♠ 、♣、♥、♦ ，首先将扑克按顺序存放到一个一维数组中，然后按洗牌算法进行洗牌,最后，按东、南、西、北进行分发，显示扑克时将同一花色放在一起。

　　card类

public class card {
    private String color;
    private String num;
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public String getNum() {
        return num;
    }
    public void setNum(String num) {
        this.num = num;
    }
    @Override
    public String toString() {
        return "\t"+color+"-"+num;
    }
}

　　具体算法代码：建牌库，洗牌，理牌

public class cards_test {
    public static void main(String[] args) {
        final int N=52,M=13;
        card[] cards=new card[N];
        card[] East=new card[M];
        card[] West=new card[M];
        card[] North=new card[M];
        card[] South=new card[M];
        for(int i=0;i<M;i++)
            East[i]=new card();
        for(int i=0;i<M;i++)
            South[i]=new card();
        for(int i=0;i<M;i++)
            West[i]=new card();
        for(int i=0;i<M;i++)
            North[i]=new card();
        String[] color= {"红桃","草花","红心","方片"};
        String[] num= {"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
        for(int i=0;i<N;i++) {
            cards[i]=new card();
            cards[i].setNum(num[i%13]);
            cards[i].setColor(color[i/13]);
        }
        System.out.println("洗牌前");
        for(int i=0;i<N;i++) {
            System.out.print(cards[i].toString());
            if((i+1)%13==0)
                System.out.println();
        }
        for(int i=0;i<N;i++) {
            int index=(int)(Math.random()*10000)%52;
            String temp=cards[i].getNum();
            cards[i].setNum(cards[index].getNum());
            cards[index].setNum(temp);
            String co=cards[i].getColor();
            cards[i].setColor(cards[index].getColor());
            cards[index].setColor(co);
        }
        System.out.println("洗牌后");
        String[] position= {"东:","西:","南:","北:"};
        for(int i=0;i<N;i++) {
            if(i%13==0)
                System.out.print(position[i/13]);
            if(i>=0&&i<=12)
                East[i]=cards[i];
            else if(i>=13&&i<=25)
                South[i-13]=cards[i];
            else if(i>=26&&i<=38)
                West[i-26]=cards[i];
            else
                North[i-39]=cards[i];
            System.out.print(cards[i].toString());
            if((i+1)%13==0)
                System.out.println();
        }
        System.out.print("理牌后（相同花色放一起）");
        System.out.print("\n"+position[0]);
        for(int j=0;j<4;j++)
            for(int i=0;i<M;i++)
                if(East[i].getColor().equals(color[j]))
                    System.out.print(East[i].toString());
        System.out.print("\n"+position[1]);
        for(int j=0;j<4;j++)
            for(int i=0;i<M;i++)
                if(West[i].getColor().equals(color[j]))
                    System.out.print(West[i].toString());
        System.out.print("\n"+position[2]);
        for(int j=0;j<4;j++)
            for(int i=0;i<M;i++)
                if(South[i].getColor().equals(color[j]))
                    System.out.print(South[i].toString());
        System.out.print("\n"+position[3]);
        for(int j=0;j<4;j++)
            for(int i=0;i<M;i++)
                if(North[i].getColor().equals(color[j]))
                    System.out.print(North[i].toString());
    }

}