用java写出商品打折程序 java用接口做一个商品打折的程序
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尝试解答一下，这个里面还有老年和教师的判断就省略，主要是打折的代码
import java.util.Scanner;
class Test{
public static void main (String[] args){
Scanner sc = new Scanner(System.in);
System.out.println("请输入消费的金额：");
double oldprice = sc.nextDouble();
double newprice;
if(oldprice >= 2000){
newprice = oldprice * 0.85;
}else if(oldprice >= 1000 && oldprice < 2000){
newprice = oldprice * 0.9;
}else
newprice = oldprice;
Judge jud = new Judge();
if(jud.isTeacher()|| jud.isOldman())
newprice = newprice * 0.95;
System.out.println("打折后的价格是：" + newprice);
System.out.println("折扣的程度是： " + newprice / oldprice);
}
}
class Judge{
public boolean isTeacher(){
boolean isTeacher = false;
return isTeacher;
}
public boolean isOldman(){
boolean isOld = false;
return isOld;
}
}
if条件{满足条件执行}else if 条件{满足条件执行}else{满足条件执行}
上述的条件就是总的消费金额，比如消费金额大于等于2000，执行消费金额打85折。
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