我是一个新手 java 学生。我有一个 java 类的项目,我在那里写一个 Golfer 类,Score 类和一个 Golfer 类的测试人员来测试所有方法。我遇到的具体问题是:

当我调用 addScore 方法时,该方覆盖旧数据,而不是添加到现有的。我需要让程序在之前的分数之外添加数组中的分数。

findScore 方法是私有的,并在公共方法 getScore 中使用,但是,当我运行程序时,无论调用中的参数如何,我都会得到 null 值。我需要根据输入的日期返回数组的索引。

以下是代码摘录，而不是整个程序。

public class Golfer {
   /**String representing the golfer's name*/
   private String name;
   /**String representing the golf course where the golfer's hadicap is kept*/
   private String homeCourse;
   /**Unique integer that identifies every golfer*/
   private int idNum;
   /**Array storing all the golfer's scores*/
   private Score[] scores;
   public static int nextIDNum;
   /**Default constructor, sets all instance field to a default value.     Creates Array.
   */
   public Golfer() {
      name = "";
      homeCourse = "";
      scores = new Score[0];
      nextIDNum = 1000;
   }
   /**Constructor sets name and homeCourse from parameters and uses the static variable nextIDNum to retrieve the next available ID number. Creates Array.
   */
   public Golfer(String golferName, String home) {
      setName(golferName);
      setHomeCourse(home);
      setNextIDNum(nextIDNum);
      scores = new Score[10];
   }
   /**Creates a Score object from the parameters that represent the course, course rating, course slope, date and score.  Adds the newly created Score object to the Array of Scores. 
   @param golfCourse A String representing the golf course name
   @param rating A double representing the golf course rating
   @param slope An int representing the golf course slope
   @param scoreDate A String representing the date the course was played
   @param score An int representing what was scored on the course
   */
   public void addScore(String golfCourse, double rating, int slope, String scoreDate, int score) {
      Score[] golfScores = new Score[scores.length + 1];
      for (int i = 0; i < scores.length; i++) {
             golfScores[i] = scores[i]; 
      }
      golfScores[golfScores.length - 1] = new Score(golfCourse, rating, slope, scoreDate, score);
      scores = golfScores;
   }
   /**Deletes a score from the Array based on score date,  Assumes only one score per day. 
   @param golfDate A string representing the date of the golf score
   @return true if score found and deleted, 
   @return false if score not found.
   */
   public boolean deleteScore (String golfDate) {
      for (int i = 0; i < scores.length; i++) {
         if (findScore(golfDate) > 0) {
            scores[i] = null;
         } 
         return true;        
      }
      return false;
   }
   /**Returns a score object based on the score date. If not found returns null
   @param golfDate The date of the golf score
   @return Scores[i] The score on the parameterized date
   @return null A null value if the score was not found.
   */
   public Score getScore(String golfDate) {
      for (int i = 0; i < scores.length; i++) {
         if (findScore(golfDate) > 0) {
            return scores[i];
            }  
      }
      return null;
   }
   /**Given a parameter representing the score's date, finds the score    on a given date and returns the Array index of a score. Return constant NOTFOUND if not found.
   @param golfDate A string representing the date of the score
   @return i An array index representing the score
   @return NOTFOUND A constant set to -1 if the score isn't found
   */
   private int findScore(String golfDate) {
      final int NOTFOUND = -1;
      for (int i = 0; i < scores.length; i++) {
         if (scores[i].equals(golfDate)) {
            return i;
         }
      }
      return NOTFOUND;
   }
}

分数类：

public class Score {
   private String courseName;
   private int score;
   private String date;
   private double courseRating;
   private int courseSlope;
   public Score(String course, double rating, int slope, String golfDate, int scr) {
      setCourseName(course);
      setScore(scr);
      setDate(golfDate);
      setCourseRating(rating);
      setCourseSlope(slope);
   }
   public Score() {
      courseName = "";
      score = 0;
      date = "";
      courseRating = 0.0;
      courseSlope = 0;
   }
   public void setCourseName(String course) {
      courseName = course;
   }
   public String getCourseName() {
      return courseName;
   }
   public void setScore(int golfScore) {
      if ((golfScore < 40) && (golfScore > 200)) {
         golfScore = 9999;
         System.out.println("Error: golf score must be between 40 and 200.");
         }
            score = golfScore;
   }
   public int getScore() {
      return score;
   }
   public void setDate(String golfDate) {
      date = golfDate;
   }
   public String getDate() {
      return date;
   }
   public void setCourseRating(double rating) {
      if ((rating < 60) && (rating > 80)) {
         rating = 9999;
         System.out.println("Error: the course rating must be between 60 and 80.");
         }
            courseRating = rating;
   }
   public double getCourseRating() {
      return courseRating;
   }
   public void setCourseSlope(int slope) {
      if ((slope < 55) && (slope > 155)) {
         slope = 9999;
         System.out.println("Error: The course slope must be between 55 and 155.");
         }
            courseSlope = slope;
   }
}

测试仪类：

public class GolferTester {
   public static void main (String []args) {
      String course1 = "Augusta National";
      String course2 = "Bayhill CC";
      String course3 = "TPC Sawgrass";
      String player1 = "Sam Snead";
      String player2 = "Arnold Palmer";
      String player3 = "Jack Nicklaus";
      int score1  = 66;
      int score2  = 201;
      int score3  = 72;
      int slope1  = 60;
      int slope2  = 156;
      int slope3  = 77;
      double rating1 = 65.2;
      double rating2 = 81.8;
      double rating3 = 70.9;
      String date1 = "01/01/2017";
      String date2 = "06/01/2016";
      String date3 = "12/22/2016";
      Golfer golfer1    = new Golfer(player1, course1);
      Golfer golfer2    = new Golfer(player2, course2);
      Score s1 = new Score(course1, rating1, slope1, date1, score1);
      Score s2 = new Score(course2, rating2, slope2, date2, score2);
      s1.setScore(score1);
      s1.setDate(date1);
      s1.setCourseRating(rating1);
      s1.setCourseSlope(slope1);
      s1.setCourseName(course1);
      s2.setScore(score3);
      s2.setDate(date3);
      s2.setCourseRating(rating3);
      s2.setCourseSlope(slope3);
      s2.setCourseName(course3);
      golfer1.addScore(s1.getCourseName(), s1.getCourseRating(), s1.getCourseSlope(), s1.getDate(), s1.getScore());
      golfer2.addScore(s2.getCourseName(), s2.getCourseRating(), s2.getCourseSlope(), s2.getDate(), s2.getScore());
      System.out.println(golfer1);
      System.out.println("");      
      System.out.println(golfer2);
      System.out.println("");
      s1.setScore(score2);
      s1.setCourseRating(rating2);
      s1.setCourseSlope(slope2);
      golfer1.addScore(s1.getCourseName(), s1.getCourseRating(), s1.getCourseSlope(), s1.getDate(), s1.getScore());     
      System.out.println(golfer1);
      deleteScore(s1.getDate());
      System.out.println(s1.getDate());
   }
}

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