P168 实战练习（权限修饰符）

创建Game类，运行代码如下：

package org.hanqi.pn0120;

public class Game {

    private String name;
    private String category;
    private int totalcost = 10000;
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getCategory() {
        return category;
    }
    public void setCategory(String category) {
        this.category = category;
    }
    public int getTotalcost() {
        return totalcost;
    }
    public void setTotalcost(int totalcost) {
        this.totalcost = totalcost;
    }
    
    public Game(String name, String category) {
        super();
        this.name = name;
        this.category = category;        
    }    
    
    public void cost1(int cost)
    {
        if(cost <= 0)
        {
            System.out.println("做游戏的钱呢？！");            
        }
        else if(cost>this.totalcost)
        {
            int excess=cost-this.totalcost;
            System.out.println("超出预算了，超了"+excess+"金额的预算");
        }
        else
        {
            this.totalcost=cost;
            System.out.println("这次预算是"+this.totalcost);            
        }            
    }    
    
    private int sales;
    public int getSales()
    {
        return this.sales;
    }
    public void money(int number,int price)
    {
        if(number<=0)
        {
            System.out.println("一份都没卖出去，赔钱了，公司要倒闭");
        }
        else if(price<=0)
        {
            System.out.println("为什么定价是0？");
        }
        else if(price>50)
        {
            System.out.println("定价太高了");
        }
        else
        {
            this.sales=number*price;
            System.out.println("销售额是"+sales);
        
        if(this.sales<this.totalcost)
        {
            int debt = this.totalcost-this.sales;
            System.out.println("入不敷出，公司倒闭，欠了 "+debt+" 金额的债务");
        }
        else
        {
            int profit = this.sales-this.totalcost;
            System.out.println("挣钱了，利润是"+profit);
        }
        }
    }
    
    public static void main(String[]args)
    {
        Game myGame = new Game("你与我的星空","Galgame");
             System.out.println("游戏名称是："+myGame.getName());
             System.out.println("游戏类型为："+myGame.getCategory());
             myGame.cost1(-10000);             
             myGame.cost1(20000);
             myGame.cost1(2000);
             myGame.money(0, 25);
             myGame.money(14, 0);
             myGame.money(200, 88);
             myGame.money(200, 25);             
    }    
}

则运行代码为：