Using an array of objects

[katiebear128]

I am given this class, WordCount.

public class WordCount{

  private String word;
  private int count;

  public WordCount(String w){
    word = w;
    count = 0;
  }

  public String getWord(){
    return word;}
  
   public int getCount(){
    return count;}

  public void incCount(){count++;}

  public String toString() {
    return(word +  " --- " + count);
  }
  
  public boolean equals(Object other){
    WordCount i = (WordCount)other;
    return (this.word.equals(i.word));
  }
}

I need to make another class, where it uses WordCount as an array of objects.In this class it takes a string of text, s, splits it into individuals words, then compares each word to another string w. If they match, it raises the count and in the final output it shows the word and number of counts.

public class ArrayPlay{
  public static void main (String[] args){
    
    WordCount[] objects=new WordCount[4];
    String s="hi how hi you hi";//the text
    String input="hi"; //the string to match to
    String[] words=s.split("\\s");

    for(String w: words){ //for every word, w,  in the words Array
      if(w.equals(input)){ // if the word, w, equals the user input
      for(int index=0;index<words.length;index++){
      System.out.println(objects[index].getWord()+ " "+ objects[index].getCount());//prints out the word and count at index i
      }
      
  }
}
  }
}

Ok, I didnt worry about changing the count at this point...I'm just trying to get it to print out hi 0 right now, and while it compiles I get a
NullPointerException. I'm guessing this has to do with WordCount objects=new WordCount[4]...Ideally the WordCount has sized based on the string length, so if I changed the string length it would still work...Can anyone point me in the right direction?

[eRaaaa]

Please post the whole NPE error message in the future.
objects[index].getWord() <-- you never create WordCount objects and set it to index so objects[0] or objects[index] are null !
objects[0] = new WordCount()..... or similar is missing

[katiebear128]

thank you! I fixed that problem.

public class ArrayPlay{
  public static void main (String[] args){
     String s="hi how hi you hi";//the text
    WordCount[] objects=new WordCount[4];
    String input="hi"; //the user input
    String[] words=s.split("\\s");

    for(String w: words){ //for every word, w,  in the words Array
      if(w.equals(input)){ // if the word, w, equals the user input
      for(int index=0;index<words.length;index++){
        objects[index]=new WordCount(w);
        objects[index].incCount();
      System.out.println(objects[index].getWord()+ " "+ objects[index].getCount());//prints out the word and count at index 
      }
      
  }
}

    
  }
}

How come the count does not increase? Is it because of where my print statement is? I think I have to get rid of the print statement anyway and maybe use the toString() method... I'm not sure exactly how to do it, objects.toString() doesnt work...