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  葉子醬油 2017-09-05 16:27:00

  package arraylist; public class Course { private String name; private double score; public String getName() { return name; } public void setName(String name) { this.name = name; } public double getScore() { return score; } public void setScore(double score) { this.score = score; } } package arraylist; public class Student { private String name; private Course[] scores; private double average; public String getName() { return name; } public void setName(String name) { this.name = name; } public Course[] getScores() { return scores; } public void setScores(Course[] scores) { this.scores = scores; } public double getAverage() { return average; } public void setAverage(double average) { this.average = average; } public void display(){ System.out.println("學生的姓名是" + this.getName() + "."); for(int i = 0; i < scores.length; i++){ System.out.println("第" + (i + 1) + "門課程的名稱是 " + scores[i].getName() + "，成績是" + scores[i].getScore()); } System.out.println("學生" + this.getName() +"的平均成績是" + this.getAverage()); } public void calAverage(){ double sum = 0; for(int i = 0; i< scores.length; i++){ sum += scores[i].getScore(); } this.setAverage(sum/scores.length); } public void changeGrade(int i， int score){ scores[i].setScore(score); } } package arraylist; public class TestDemo { public static void main(String[] args){ Student stu = new Student(); stu.setName("小明"); Course[] scores = new Course[3]; scores[0] = new Course(); scores[0].setName("英語"); scores[0].setScore(90); scores[1] = new Course(); scores[1].setName("語文"); scores[1].setScore(99); scores[2] = new Course(); scores[2].setName("數(shù)學"); scores[2].setScore(80); stu.setScores(scores); stu.calAverage(); stu.display(); stu.changeGrade(1， 90); stu.display(); } }

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