10.9（Course類）改寫Course類

• 題目
• • 程序
• 代碼
• • qingdan.java
  • Test9.java
  • Test9_Course.java
  • 運行實例

題目

程序

Test9.java：測試程序
Test9_Course.java：構造程序
qingdan.java：需要改寫的類

代碼

qingdan.java

public class qingdan {private String courseName;private String[] students = new String[100];private int numberOfStudents;public qingdan(String courseName){this.courseName = courseName;}public void addStudent(String student){students[numberOfStudents] = student;numberOfStudents++;}public String[] getStudents(){return students;}public int getNumberOfStudents(){return numberOfStudents;}public String getCourseName(){return courseName;}public void dropStudent(String student){} }

Test9.java

public class Test9 {public static void main(String[] args) {Test9_Course tc = new Test9_Course("mycourse");tc.addStudent("zhang");tc.addStudent("wang");tc.addStudent("li");tc.dropStudent("wang");System.out.println(tc.getNumberOfStudents()); // 2} }

Test9_Course.java

public class Test9_Course {private String courseName;private String[] students = new String[100];private int numberOfStudents;public Test9_Course(String courseName){this.courseName = courseName;}// 任務點2：改寫addStudent方法public void addStudent(String student){if (numberOfStudents >= student.length()){String[] temp = new String[numberOfStudents + 50];for (int i = 0 ; i < numberOfStudents ; i++){temp[i] = students[i];}students = temp;}students[numberOfStudents] = student;numberOfStudents++;}// 任務點1：改寫getStudent方法public String[] getStudents(){String[] feedback = new String[numberOfStudents];for (int i = 0 ; i < numberOfStudents ; i++){feedback[i] = students[i];}return feedback;}public int getNumberOfStudents(){return numberOfStudents;}public String getCourseName(){return courseName;}// 任務點3：完善dropStudent方法public void dropStudent(String student){for (int i = 0 ; i < numberOfStudents ; i++){if (students[i].equals(student)){for (; i < numberOfStudents ; i++){students[i] = students[i+1];}numberOfStudents--;return;}}}// 任務點4：添加clear方法public void clear(){String[] temp = new String[100];students = temp;} }

運行實例

2

總結

以上是生活随笔為你收集整理的Java黑皮书课后题第10章：**10.9（Course类）如下改写Course类的全部內容，希望文章能夠幫你解決所遇到的問題。

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