expense.java

关于汽车的购买系统,收费系统,汽车耗油系统,是早期和同学开发的JAVA程序

package homework;


public abstract class Expense {
    boolean isPaid=false;
    protected String date;
    protected String description;
  
    public Expense() {
        this("3000","shopping");
    }
    public Expense(String date,String description){
       setDate(date);
       setDescription(description);
    }
    
    
    boolean isPaid(){    
        return this.isPaid;
    
}
   public void isPaid(boolean isPaid) {
        this.isPaid=isPaid;
    } 
    

   

    public void setIsPaid(boolean isPaid) {
        this.isPaid = isPaid;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
     public String toString(){
       return "Date: "+this.getDate()+"   Description: "+this.getDescription()+"  Paid?: "+(this.isPaid()?"Yes":"No");
    }
     abstract double getTotal();
     abstract double getTax();
     abstract int getRDPoints();
}