Java實驗報告三

1、天津商業(yè)大學學生實驗報告開課實驗室：現(xiàn)代信息交流中心403 開課時間: 2015年*月*日 實驗報告: 2015 年 04 月 17日 學院名稱信息工程學院年級、專業(yè)、班計科學號姓名同組姓名無課程名稱Java程序設計實驗項目名稱Java面向?qū)ο蟪绦蛟O計（2）指導教師尉斌實驗類型驗證 綜合 設計 創(chuàng)新 成績教師評語 教師簽名： 年 月 日一、 實驗目的：熟悉類、對象、方法、繼承和多態(tài)的使用方法。二、 實驗內(nèi)容：1. 創(chuàng)建一個Point類，包含坐標x、y。然后創(chuàng)建一個Line類，定義兩個讀寫屬性start和end，數(shù)據(jù)類型為Point，定義Line類方法（計算start和end之間的距離，并打印s

2、tart和end坐標以及距離信息）。2. 根據(jù)下面類圖，設計一個名為Student的類，包括屬性“學號”、“姓名”以及3門課程“數(shù)學”、“英語”和“計算機”的成績，包括的方法有計算3門課程的“總分”、“平均分”、“最高分”及“最低分”。在此基礎上，使用數(shù)組來實現(xiàn)對多個學生的管理。編寫一個控制臺應用程序，實現(xiàn)如下菜單功能。3. 題目：品嘗飲料要求：（1）使用鍵盤輸入?yún)?shù)（飲料類型），輸出該飲料類型的味道，如：當鍵盤輸入?yún)?shù)為1時，結果見圖1：（2）如果沒有該種飲料，結果見圖2：實現(xiàn)步驟：（1） 建立一個Java抽象類Drink，應當：a、 聲明一個抽象方法taste( )，該方法負責輸出飲料的味

3、道；b、 聲明int型常量來代表不同的飲料類型（咖啡、啤酒、牛奶）c、 聲明靜態(tài)工廠方法getDrink(int drinkType)，根據(jù)傳入的參數(shù)創(chuàng)建不同的飲料對象，并返回該對象，建議使用switch語句。（2） 建立Drink的具體子類：a、 分別建立Drink的子類：Coffee（代表咖啡），Beer（代表啤酒），Milk（代表牛奶）；b、 實現(xiàn)taste（）方法，要求在屏幕輸出中打印各自的味道特征。（3） 建立Test測試類，測試以上內(nèi)容的正確性a、 編寫main方法，通過命令行傳參的方式傳入某種飲料的類型。b、 在main方法中，調(diào)用Drink類的getDrink方法，獲得相應的飲

4、料對象。c、 然后調(diào)用該飲料的taste（）方法，輸出該飲料的味道。三、 源代碼清單：1 源代碼清單public class Point public static void main(String args)Point point1=new Point(1,2);Point point2=new Point(4,6);Line line1=new Line(point1, point2);System.out.println("The distance is "+line1.line()+"nThe start is "+"("+l

5、ine1.start.x+","+line1.start.y+")"+"nThe end is "+"("+line1.end.x+","+line1.end.y+")"); double x;double y;Point()Point(double x, double y)this.x=x;this.y=y;class Line Point start;Point end;Line()Line(Point newStart, Point newEnd)start=newSt

6、art;end=newEnd;public double line()return Math.sqrt(end.x-start.x)*(end.x-start.x)+(end.y-start.y)*(end.y-start.y);2源代碼清單public class Student String stuno;String name;float math;float english;float computer;Student() Student(String stuno, String name, float math, float english, float computer)this.s

7、tuno=stuno;=name;this.math=math;this.english=english;puter=computer;public String getStuno() return stuno;public void setStuno(String s) this.stuno = s;public String getName() return name;public void setName(String n) = n;public float getMath() return math;public void setMath(floa

8、t m) this.math = m;public float getEnglish() return english;public void setEnglish(float e) this.english = e;public float getComputer() return computer;public void setComputer(float c) puter = c;public double sum() return math+english+computer;public double avg()return (math+english+computer)/3;publ

9、ic double max(double max)if(math>=english)if(math>=computer)max=math;else max=computer;else if(math<english)if(english<computer)math=computer;elsemax=english;return max;public double min(double min)if(math<=english)if(math<=computer)min=math;elsemin=computer;else if(math>english

10、)if(computer>english)min=english;else min=computer;return min;public class Manager extends Student private Student student = new Student100;private static int numberOfStudent = 0;int getNumberOfStudent() return numberOfStudent;Student getStudent() return student;boolean addStudent(Student student

11、) try this.studentnumberOfStudent = student;numberOfStudent+;return true; catch (Exception e) return false;boolean removeStudent(String stuno) boolean target = false;for (int i = 0; i < numberOfStudent; i+)if (studenti.getStuno().equals(stuno) studenti = null;target = true;return target;Student f

12、indStudent(String s) for (int i = 0; i < numberOfStudent; i+)if (studenti != null)if (studenti.getStuno().equals(s)| studenti.getName().equals(s)return studenti;return null;boolean changeStudent(Student student) for (int i = 0; i < numberOfStudent; i+) if (this.studenti.getStuno().equals(stude

13、nt.getStuno()| this.studenti.getName().equals(student.getName() this.studenti = student;return true;return false;void print() System.out.println("學號t姓名t數(shù)學t英語t計算機");for (int i = 0; i < numberOfStudent; i+)if (studenti != null) System.out.println(studenti.getStuno() + "t"+ stude

14、nti.getName() + "t" + studenti.getMath()+ "t" + studenti.getEnglish() + "t"+ studenti.getComputer();void caculate() float max_math = 0, min_math = student0.getMath(), sum_math = 0;for (int i = 0; i < numberOfStudent; i+) sum_math += studenti.getMath();if (studenti.ge

15、tMath() > max_math)max_math = studenti.getMath();else if (studenti.getMath() < min_math)min_math = studenti.getMath();float avg_math = sum_math / numberOfStudent;float max_english = 0, min_english = student0.getEnglish(), sum_english = 0;for (int i = 0; i < numberOfStudent; i+) sum_english

16、+= studenti.getEnglish();if (studenti.getEnglish() > max_english)max_english = studenti.getEnglish();else if (studenti.getEnglish() < min_english)min_english = studenti.getEnglish();float avg_english = sum_english / numberOfStudent;float max_computer = 0, min_computer = student0.getComputer(),

17、 sum_computer = 0;for (int i = 0; i < numberOfStudent; i+) sum_computer += studenti.getComputer();if (studenti.getComputer() > max_computer)max_computer = studenti.getComputer();else if (studenti.getComputer() < min_computer)min_computer = studenti.getComputer();float avg_computer = sum_com

18、puter / numberOfStudent;System.out.println("學科t平均成績t最高分t最低分");System.out.println("數(shù)學t" + avg_math + "t" + max_math + "t"+ min_math);System.out.println("英語t" + avg_english + "t" + max_english + "t"+ min_english);System.out.println(

19、"計算機t" + avg_computer + "t" + max_computer + "t"+ min_computer);import java.util.Scanner;public class TestStudent public static void main(String args) Manager manager = new Manager();System.out.println("1.添加學生n2.刪除學生n3.查詢學生n4.修改學生n5.打印學生n6.統(tǒng)計學生n7.退出");Scanner

20、scanner = new Scanner(System.in);boolean flag = true;while (flag) int input = 9;try input = scanner.nextInt(); catch (Exception e) System.out.println("Wrong operation.");flag = false;switch (input) case 1:System.out.println("Enter the student's information(stuno,name,math,english,

21、computer):");Student student1 = new Student();student1.setStuno(scanner.next();student1.setName(scanner.next();student1.setMath(scanner.nextFloat();student1.setEnglish(scanner.nextFloat();student1.setComputer(scanner.nextFloat();if (manager.addStudent(student1)System.out.println("success.&

22、quot;);elseSystem.out.println("fail.");break;case 2:System.out.println("Enter the stuno:");if (manager.removeStudent(scanner.next()System.out.println("success.");elseSystem.out.println("fail.");break;case 3:System.out.println("Enter the stuno or name:&quo

23、t;);Student student3 = manager.findStudent(scanner.next();if (student3 != null) System.out.println(student3.getStuno() + "t"+ student3.getName() + "t" + student3.getMath()+ "t" + student3.getEnglish() + "t"+ student3.getComputer(); elseSystem.out.println("

24、;There is no such a student.");break;case 4:System.out.println("Enter the changed student(stuno,name,math,english,computer):");Student student4 = new Student();student4.setStuno(scanner.next();student4.setName(scanner.next();student4.setMath(scanner.nextFloat();student4.setEnglish(sca

25、nner.nextFloat();student4.setComputer(scanner.nextFloat();if (manager.changeStudent(student4)System.out.println("change success.");elseSystem.out.println("change fail.");break;case 5:manager.print();break;case 6:try manager.caculate();break; catch (Exception e) System.out.println("there is no student.");case 7:flag = false;System.out.println("退出。");break;default:System.out.println("Wrong operation.");3. 源代碼清單public abstract class Drink public abstract String getTaste();int drinkType; int Coffee=1;i