java - 将输入限制为 set mutator 中的 true 语句

Question

这是一个简单的问题，当我创建一个新的“音乐会”对象类时，如何使用 joptionpane 对话框限制它，当我运行它时，程序似乎并不关心我是否设置了布尔限制。我可以在一个月内输入 25，它会很好，并且在输出字符串中它显示“25”而没有错误。

if (userInput.equals("1")) {
       do{
        String artist = getStringInput("Artist or Group name?");
        int month = getIntegerInput("Enter month in XX format ");
        int day = getIntegerInput("Enter day in XX format ");
        int year = getIntegerInput("Enter year in XXXX format");
        int ticketCost = getIntegerInput("Enter cost per ticket ($25 - $250)");
        int quantTickets = getIntegerInput("Enter Number of tickets available (Max 10,000)");  
        int concertId = 1000;    
        concert[numConcert++] = new Concert(artist,quantTickets,ticketCost,month,day,year,concertId);

班级

   private String artist = "";
   private int quantTickets = 0;
   private int ticketCost = 0;
   private int month = 0;
   private int day = 0;
   private int year = 0;
   private int numConcert = 0;
   private int concertId = 1000;

  public Concert(String artist, int quantTickets, int ticketCost, int month, int day, int year, int concertId){
  this.artist = artist;
  this.quantTickets = quantTickets;
  this.ticketCost = ticketCost;
  this.month = month;
  this.day = day;
  this.year = year;
   this.concertId = concertId;
} 


   public boolean setMonth (int month){
        if (negative(month)) return false;
        if (month > 12) return false;
          this.month = month; 
         return true;
 }

    public int getMonth (){
        return this.month ;
  }

Answer 1

你说“this.month = month”。您必须在此处调用 setMonth(int month) 方法。