如何在数组中找到状态

Question

我需要有关如何查找用户选择的状态信息并将其显示到屏幕上的帮助。我有五个文件放入数组中。这五个数组包含一个州的信息（州名、州首府、州昵称、州花、州人口。）

我的程序应该允许程序的用户输入州名，并且应该在屏幕上显示有关该州的信息（昵称、首都、花卉和人口）。

每个输入文件都包含按州名字母顺序排列的信息。所以州名文件第1行是阿拉巴马州，大写文件第1行是蒙哥马利（阿拉巴马州首府），花卉文件第1行是阿拉巴马州的州花，昵称文件第1行是阿拉巴马州的昵称，并且人口文件的第 1 行是阿拉巴马州的人口。每个文件的第 2 行是阿拉斯加的信息，第 3 行是亚利桑那州等。

这是我目前的代码。

public static void main(String[] args) throws FileNotFoundException {

   String capital, stateFlowers, stateNickName, statesNames;
   int statePopulation;

   Scanner keyboard = new Scanner (System.in);
   String userStateChoise;

   File capitals = new File("capitals.txt");
   File flores = new File("flowers.txt");
   File nickName = new File("nicknames.txt");
   File populacion = new File("population.txt");
   File state_Name = new File("stateNames.txt");

    System.out.println("Enter a State Name");

    userStateChoise = keyboard.nextLine();




    if (!capitals.exists()) {
        System.out.println("The capitals input file was not found");
        System.exit(0);
    }
     if (!flores.exists()) {
        System.out.println("The flores input file was not found");
        System.exit(0);
    }
     if (!nickName.exists()) {
        System.out.println("The nickName input file was not found");
        System.exit(0);
    }
     if (!populacion.exists()) {
        System.out.println("The populacion input file was not found");
        System.exit(0);
    }
      if (!state_Name.exists()) {
        System.out.println("The stateName input file was not found");
        System.exit(0);
    }



    Scanner inputFile = new Scanner(capitals);
    Scanner flower = new Scanner(flores);
    Scanner nickNames = new Scanner(nickName);
    Scanner populations = new Scanner(populacion);
    Scanner names = new Scanner(state_Name);       
    // ArrayList myCapitals = new ArrayList();
   //  ArrayList<String> stateNames = new ArrayList();

     while (inputFile.hasNext() && flower.hasNext() && nickNames.hasNext()
         &&   populations.hasNext() && names.hasNext())
     {
// reading all states from the input file           

//reading all cities from the input file            
        capital = inputFile.nextLine();
        stateFlowers = flower.nextLine();
        stateNickName = nickNames.nextLine();
        statePopulation = populations.nextInt();
        statesNames = names.nextLine();

 String[] stateCapitalArray = {capital};
 String[] stateflowersArray = {stateFlowers};
 String[] stateNickNameArray = {stateNickName};
 int [] statePopulationArray = {statePopulation};
 String[] stateNamesArray = {statesNames};

      // I used for loops to go through each item in the array and to display it to the        screen

  for (int index = 0; index < stateNamesArray.length; index++)
  {
      System.out.println("State name : " +stateNamesArray[index]);        
     }

   for (int index = 0; index < stateflowersArray.length; index++)
  {
      System.out.println("State flower : " + stateflowersArray[index]);        
     }
    for (int index = 0; index < stateCapitalArray.length; index++)
  {
      System.out.println("The capital : " + stateCapitalArray[index]);        
     }
  for (int index = 0; index < stateNickNameArray.length; index++)
  {
      System.out.println("State nickName : " + stateNickNameArray[index]);        
     }


   for (int index = 0; index < statePopulationArray.length; index++)
  {
      System.out.println("State pupoluation  : " + statePopulationArray[index]); 
      System.out.println("\n\n\n");
     } 

     }

     inputFile.close();
     flower.close();
     nickNames.close();
    // populations.close();
}

}

Answer 1

除了收集和存储信息以及获取用户输入的笨拙方法之外，我看到的最明显的错误是您如何构建阵列。每次读取新行时，您都在用一个东西重新初始化每个数组，而不是将每个东西添加到每个数组中。 您最终会得到每个文件中最后一项的数组。应该在 while 循环之外创建和初始化数组，并在读取它们时将每个项目添加到其中。