第四次上机

package electriccharge;

public class Power {
       final double PRICE = 1.2;
       private double lastmonthpower;
       private double thismonthpower;
       public void setlastmonthpower(double change){
           this.lastmonthpower = change;
       }
       public double getlastmonthpower(){
           return this.lastmonthpower;
       }
       public void setthismonthpower(double change){
           this.thismonthpower = change;
       }
       public double getthismonthpower() {
           return this.thismonthpower;
       }
       public double compute(double lastmonthpower,double thismonthpower){
           return (thismonthpower-lastmonthpower)*PRICE;
       }
}

package electriccharge;

public class Testpower {
       public static void main(String[] args){
           Power p1 = new Power();
           Power p2 = new Power();
           p1.setlastmonthpower(1000);
           p1.setthismonthpower(1200);
           p2.setlastmonthpower(1200);
           p2.setthismonthpower(1450);
           System.out.println("本月电费为：");
           System.out.println (p1.compute(p1.getlastmonthpower(),p1.getthismonthpower()));
           p2.setthismonthpower(1500);
           System.out.println("本月电费为：");
           System.out.println(p2.compute(p2.getlastmonthpower(),p2.getthismonthpower()));
       }
}