java - 带数组的 if 语句的空指针异常

Question

我在星号包围的行处不断收到空指针异常。我怎样才能解决这个问题？我不明白为什么会发生这种情况，因为我用 false 填充了 currentGuessArray 。(我没有包含所有代码，仅包含与 currentGuessArray 相关的部分。)

public static boolean [] currentGuessArray;


public void initGuess() { 
   // creates a new Array for the currentGuessArray variable 
   boolean [] currentGuessArray = new boolean[20];
   // initialize all slots to false
   Arrays.fill(currentGuessArray, false);
}

public String getCurrentGuessArray() { 
   // the returned String has "_ " for unrevealed letters
   // “walk over” the currentWord and currentGuessArray Arrays and create the String
   if ( !currentWord.equals("Shrek") && !currentWord.equals("Dobby") ) {
       int j = 1;
       while ( (!currentWord.substring(j, j).equals(" ")) && (j < currentWord.length()) ) {
          j++;
          spaceSpot = j;
       }
   }
   int k = 0;
   String displayString = "";
   while ( k < currentWord.length() ) {
      if ( k == spaceSpot ) {
         displayString = displayString + "   ";
      }
      **else if ( currentGuessArray[k] == true ) {**
         displayString = displayString + currentWord.substring(k, k);
      }
      else {
         displayString = displayString + "_ ";
      }
      k++;
   }
   return displayString;        
}

Answer 1

假设正在调用 initGuess，则 shadowing currentGuessArray。替换

boolean [] currentGuessArray = new boolean[20];

与

currentGuessArray = new boolean[20];