Question

我需要知道如何拆分这两个 if else 部分。

    public static int NextBday(int Bdays, int days){
int daysleft = 0;
     if (days > Bdays) {
        daysleft= (365+Bdays) - days;
    }else if(Bdays > days){
        daysleft= Bdays-days;            
    }if (Bdays == days + 1) {
        System.out.println("\nWow, your birthday is tomorrow!");
    }else if (Bdays == days){
        System.out.println("\nHappy birthday!");
    }
    System.out.println("\nYour birthday is in " +daysleft+ " days");
return daysleft;

如果你无法从混乱中分辨出我想要的是将if语句分成两个不同的部分但仍然保留在同一个方法中。我需要做什么才能使第二个if else语句可以自行打印而不必显示剩下多少天？

e.g。 “哇，你的生日是明天！”没有“你的生日是1天”

和“生日快乐” 没有“你的生日是0天”

保持简单会有所帮助。有人需要完整的代码吗？如果有人感到困惑，我可以尝试用不同的方式表达问题。非常感谢所有帮助过的人！

Answer 1

    public static int NextBday(int Bdays, int days){
int daysleft = 0;
     if (days > Bdays) {
        daysleft= (365+Bdays) - days;
    }else if(Bdays > days){
        daysleft= Bdays-days;            
    }

    if (Bdays == days + 1) {
        System.out.println("\nWow, your birthday is tomorrow!");
    }else if (Bdays == days){
        System.out.println("\nHappy birthday!");
    } else
       System.out.println("\nYour birthday is in " +daysleft+ " days");
return daysleft;

Answer 2

if(Bdays - days != 1 && Bdays != days){ //if it's not today or tomorrow
    int daysleft;
    System.out.println("\nYour birthday is in " + (daysleft = (int)((days > Bdays)?(365+Bdays-days):(Bdays-days))) + " days."); //print the message, and calculate the correct number of days on the spot
    return daysleft;
}
else{ //if it is today or tomorrow
    System.out.println(((Bdays == days)?"\nHappy Birthday!":"\nWow, your birthday is tomorrow!")); //If it's today, print happy birthday, if it's not today it must be tomorrow. 
    return Bdays - days;
}

Answer 3

首先检查==个案，只检查其他两个案例，如果==个案都不是真的。

Answer 4

最简单的解决方案是增加回报;最后两个if（）案例中的陈述：

    public static int NextBday(int Bdays, int days){
int daysleft = 0;
     if (days > Bdays) {
        daysleft= (365+Bdays) - days;
    }else if(Bdays > days){
        daysleft= Bdays-days;            
    }if (Bdays == days + 1) {
        System.out.println("\nWow, your birthday is tomorrow!");
        return daysleft;
    }else if (Bdays == days){
        System.out.println("\nHappy birthday!");
        return daysleft;
    }
    System.out.println("\nYour birthday is in " +daysleft+ " days");
return daysleft;

Paul Tomblin的回答更清晰。

Answer 5

这听起来像是家庭作业，所以我会有点含糊，而不仅仅是给你答案。

尝试根据如何用英语描述函数来考虑您的代码。然后将其转换为伪代码，然后转换为实际代码。

“如果今天是某人的生日，那就说生日快乐。或者，如果他们的生日是明天，请说'哇'。否则只要说他们的生日还有多少天。”

伪码：

if birthdayToday
    print happy birthday message
otherwise if birthdayTomorrow
    print wow message
otherwise
    print days remaining message

最后一步是留给读者的练习。

Answer 6

我会这样做，因为最可能的情况是（＆gt; 1）所以我们把那个选项放在第一个。

int diff = Bdays - days;
if (diff > 1){
    System.out.println("\nYour birthday is in " +diff+ " days");
}
else if (diff == 1){
    System.out.println("\nWow, your birthday is tomorrow!");
}
else{
    System.out.println("\nHappy birthday!");
}

Answer 7

 public static int NextBday(int Bdays, int days){
  int daysleft = getDaysLeft(Bdays,days);//move logic to a private function
  if (daysleft == 1)
   System.out.println("\nWow, your birthday is tomorrow!");
  else if (daysleft == 0)
   System.out.println("\nHappy birthday!");
  else        
   System.out.println("\nYour birthday is in " +daysleft+ " days");
  return daysleft;
 }

 private static int getDaysLeft(int Bdays, int days) {
  if (days > Bdays)
   return (365 + Bdays) - days;
  return Bdays - days; //no need to check for the < condition        
 }

或

public static int NextBday(int Bdays, int days) { int daysleft = days > Bdays ? 365 + Bdays - days : Bdays - days; if (daysleft == 1) System.out.println("\nWow, your birthday is tomorrow!"); else if (daysleft == 0) System.out.println("\nHappy birthday!"); else System.out.println("\nYour birthday is in " + daysleft + " days"); return daysleft; }

分离“if else”语句

7 个答案: