共饮同井水

       编写程序模拟两个村庄共用同一口井水。编写一个Village类，该类有一个静态的int型成员变量waterAmount，用于模拟井水的水量。在主类Land的main()方法中创建两个村庄，一个村庄改变了waterAmount的值，另个一个村庄查看waterAmount的值。

public class Village {static int waterAmount;int peopleNumber;String name;Village(String s){name = s;}static void setWaterAmount(int m){if(m>0)waterAmount = m;}void drinkWater(int n){if(waterAmount-n>0){waterAmount = waterAmount-n;System.out.println(name+"喝了"+n+"升水");}elsewaterAmount=0;}static int lookWaterAmount(){return waterAmount;}void setPeopleNumber(int n){peopleNumber=n;}int getPeopleNumber(){return peopleNumber;}}

public class Land {public static void main(String []args){Village.setWaterAmount(200);int leftWater = Village.waterAmount;System.out.println("水井中有"+leftWater+"升水");Village zhaozhuang,majiahezhi;zhaozhuang=new Village("赵庄");majiahezhi=new Village("马家河子");zhaozhuang.setPeopleNumber(80);majiahezhi.setPeopleNumber(120);zhaozhuang.drinkWater(50);leftWater=majiahezhi.lookWaterAmount();String name=majiahezhi.name;System.out.println(name+"发现水井中有"+leftWater+"升水");majiahezhi.drinkWater(100);leftWater=zhaozhuang.lookWaterAmount();name=zhaozhuang.name;System.out.println(name+"发现水井中有"+leftWater+"升水");int peopleNumber=zhaozhuang.getPeopleNumber();System.out.println("赵庄的人口"+peopleNumber);peopleNumber=majiahezhi.getPeopleNumber();System.out.println("马家河子的人口"+peopleNumber);}}