第四次上机

package bbb;

public class aaa{  

private float a;  private float b; public aaa(){   }

public aaa(float a,float b){

 this.a=a;  this.b=b; }

public float geta(){  return a; }

public void seta(int a){

 this.a=a; } public float getb(){

 return b;

}

public void setb(int b){

 this.b=b; } public void printab(){

 System.out.println("上月电表读数为："+a+",本月电表读数为："+b); }

public void printm(){  float m;  m=(float) ((b-a)*1.2);

 System.out.println("电费为："+m);

  }

}

package bbb;

public class textaaa {

 public static void main(String[] args) {

 aaa p1 = new aaa();

  p1.seta(800);

  p1.setb(1000);

  p1.printab();

  p1.printm();

  aaa p2 =new aaa();

  p2.seta(1000);

  p2.setb(1300);

  p2.printab();

  p2.printm();

 }

}

运行结果：

上月电表读数为：800.0,本月电表读数为：1000.0
电费为：240.0
上月电表读数为：1000.0,本月电表读数为：1300.0
电费为：360.0