equalsIgnoreCase方法不具有的JOptionPane（或掃描儀）輸入

Question

// ask user to enter name of state capital 
    String answer = JOptionPane.showInputDialog("What is the capital of " + 
      question + "?"); 

    // verify name of state capital is in citiesarray 
    boolean isPresent = false; int stateNum = 0; 
    System.out.println(answer); // troubleshooting line 
    for (int i = 0; i <= 49; i++) { 
     String city = citiesarray[i]; 
     isPresent = answer.equalsIgnoreCase(city); 
     System.out.println(city); // troubleshooting line 
     System.out.println(answer.compareTo(city)); // troubleshooting line 
     System.out.println(isPresent); // troubleshooting line 
     if (isPresent == true) { 
      stateNum = i; break; 
     } 
    } 
    if (isPresent == false) { 
     JOptionPane.showMessageDialog(null, "That is incorrect. Please try another round."); 
     return; 
    } 

工作每當我運行此代碼，我最終都是假的布爾值的循環的每一次迭代，無論輸入怎樣的資本。這似乎是compareTo輸出爲任何應該返回true的城市equalsIgnoreCase總是-1，但我不知道如何使用它來識別和解決我的問題。

我試過了幾個不同的東西，發現用Scanner，它似乎工作，只要答案沒有包含空格，但這似乎並不重要JOptionPane，無論如何，我需要無論國家的首都是什麼，這都是工作的。

Answer 1

張貼的代碼工作完美，我只是增加了兩行，上面的代碼複製到主方法，適應循環的限制後：

public static void main(String[] args) { 
    String[] citiesarray = { "New York", "Paris", "Berlin", "Brasilia" }; // not real ones, but wanted one with space 
    String question = "somewhere"; 

    // ask user to enter name of state capital 
    String answer = JOptionPane.showInputDialog("What is the capital of " + 
      question + "?"); 

    // verify name of state capital is in citiesarray 
    boolean isPresent = false; int stateNum = 0; 
    System.out.println(answer); // troubleshooting line 
    for (int i = 0; i < citiesarray.length; i++) { 
     String city = citiesarray[i]; 
     isPresent = answer.equalsIgnoreCase(city); 
     System.out.println(city); // troubleshooting line 
     System.out.println(answer.compareTo(city)); // troubleshooting line 
     System.out.println(isPresent); // troubleshooting line 
     if (isPresent == true) { 
      stateNum = i; break; 
     } 
    } 
    if (isPresent == false) { 
     JOptionPane.showMessageDialog(null, "That is incorrect. Please try another round."); 
     return; 
    } 
} 

問題必須在其他地方，大概要citiesarray正在申報/初始化。