验证Java函数中的输入，以避免重复数据(非输入除外)，默认值为0(无数据库) [英] Validating inputs in a function in java to avoid duplicate data other than non entry with default of 0 (No database )

问题描述

我有三个整数变量，每个变量的默认值为0.我想将每个值更新为彼此唯一的值.如果我尝试将两个变量更新为相同的值，则验证应允许我这样做.我被困在编写程序的验证部分.请问有人可以指导我吗?

I have three integer variable of which each has default value of 0. I want to update the values each to a value that is unique from the other. In case I try update two variable to same value I should be allowed by the validation. I am stuck on writing the validation part of the program. Please can anyone guide me?

 public static int ValidateChoice(int choice, int firstChoice, int secondChoice, int thirdChoice, int totalCredit) {

    // TO DO - Add Code to:
    // Validate user menu selection (the int choice method argument)
    /* against the given registration business rules below:
       No registration of other courses not displayed by the program
       No registration more than once for the same course
       No registration for more than 9 credit hours (e.g. no more than 3 
       courses)
      */    

    //by fact the choice are limited to seven option 
    //anything beyond seven or below 1 is considered invalid
    if(choice > 8 || choice < 0){
        return -1;
        
    }

    //my problem is from here

    ///No two courses chosen should be the same 
    //therefore blacklisting the inappropriate submission of course is  captured by the condition in the if
    // initial state thirdChoice=0 secondChoice=0 firstChoice=0
    else if((firstChoice==secondChoice || firstChoice== thirdChoice || secondChoice==thirdChoice)){
        
        return -2;
    }

   // upto here

    //the total credit for the course is upto 9 hours
    else if(totalCredit > 9) {
        return -3;
    }
    else {
       return 0;  
    }
}

推荐答案

使用此:

boolean isInvalid  = firstChoice!=0 ? 
(firstChoice == secondChoice ||firstChoice == thirdChoice):
(secondChoice!=0 && secondChoice==thirdChoice);

if(isInvalid) {
  return -2;
}

代码中的另一个错误，选择检查应包括8和0

Another bug in your code, check of choice should be inclusive of 8 and 0

if(choice >= 8 || choice =< 0){
    return -1;
}

这篇关于验证Java函数中的输入，以避免重复数据(非输入除外)，默认值为0(无数据库)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！