How do use the method record(int score) in this code?

Question

how do i use record(int score) from the class Stats to record a new score?
public class ScoreInfo {
private int score;
private int numStudents;
public ScoreInfo(int aScore){
      score = aScore;
      numStudents=1;
public void increment(){numStudents++;}
public int getScore(){return score;}
public int getFrequency(){return numStudents;}
import java.util.ArrayList;
import java.*;
public class Stats
private ArrayList<ScoreInfo> scoreList;
public boolean record(int score)
     int k=0;
     while(k<scoreList.size() && score > scoreList.get(k).getScore()){
          k++;
     boolean found = k<scoreList.size() && score == scoreList.get(k).getScore();
      if(found){scoreList.get(k).increment();}
      else{scoreList.add(k,new ScoreInfo(score));}
      return found;
public void recordScores(int[] stuScores)
static int score = 50;
public static void main(String[] args) throws Exception
Stats stats = new Stats();
ScoreInfo thestat = new ScoreInfo(score);
stats.scoreList.add(thestat);
}

Answer 1

hiwa wrote:
In your main() method, or in any code which tries to create a new score, below is wrong:
ScoreInfo thestat = new ScoreInfo(score);
stats.scoreList.add(thestat);They should be:
stats.record(thestat); // record() method creates a new ScoreInfo
// and add it to the scoreList, see your own posted code
stats.record(thestat); will not work because record has a parameter that needs an integer not an object
i tried public static void main(String[] args) throws Exception
Stats stats = new Stats();
ScoreInfo thestat = new ScoreInfo(7);
stats.record(7);
but i get this error Exception in thread "main" java.lang.NullPointerException
at Stats.record(Stats.java:13)
at Stats.main(Stats.java:39)