題目要求:
代碼:
Student.java:
public class Student {private long id;//學(xué)號
private String name;//姓名
private double math;//應(yīng)用數(shù)學(xué)成績
private double English;//大學(xué)英語成績
private double Java;//java成績
private double computer;//計算機(jī)應(yīng)用基礎(chǔ)
private double average; //平均分
private int n; //總?cè)藬?shù)
public double getAverage() {return average;
}
public void setAverage(double average) {this.average = average;
}
public Student(int n,long id, String name, double math, double english, double java, double computer, double average) {this.n = n;
this.id = id;
this.name = name;
this.math = math;
this.English = english;
this.Java = java;
this.computer = computer;
this.average=average;
}
public Student() {}
public int getNum() {return n;
}
public void setNum(int n) {this.n = n;
}
public long getId() {return id;
}
public void setId(long id) {this.id = id;
}
public String getName() {return name;
}
public void setName(String name) {this.name = name;
}
public double getMath() {return math;
}
public void setMath(double math) {this.math = math;
}
public double getEnglish() {return English;
}
public void setEnglish(double English) {this.English = English;
}
public double getJava() {return Java;
}
public void setJava(double Java) {this.Java = Java;
}
public double getComputer() {return computer;
}
public void setComputer(double computer) {this.computer = computer;
}
public double getAvg(Student student) {return ( (student.getMath() + student.getEnglish() + student.getJava() + student.getComputer())/4);
}
public void setAvg(double average) {this.average=average;
}
}
StudentApplication.java:
public class StudentApplication {public static Scanner scanner = new Scanner(System.in);
public static ArrayListstudents = new ArrayList<>();
public static void main(String[] args) {Student student = new Student();
StudentManage sm=new StudentManage();
while(true){ int menuSelect=StudentManage.getMenu();
switch (menuSelect){ case 1://輸入學(xué)生相關(guān)信息
sm.addStudent(students);
break;
case 2://2按平均分降序排列
sm.sortStudent(students);
break;
case 3:// 3顯示所有成績
sm.showAllStudent(students);
break;
case 4: //4輸入查詢個人成績
sm.searchStudent(students);
break;
case 5://5顯示各科平均分,最高分,最低分
sm.averageScore(students);
break;
case 6://6退出成績管理系統(tǒng)
System.out.println("即將退出成績管理系統(tǒng)");
System.exit(0);
default:
System.out.println("請重新輸入");
break;
}
}
}
}
StudentManage.java:
public class StudentManage {private static Scanner sc=new Scanner(System.in);
//得到菜單
public static int getMenu(){System.out.println("----------學(xué)生成績管理系統(tǒng)----------");
System.out.println(" 1輸入學(xué)生相關(guān)信息");
System.out.println(" 2按平均分降序排列");
System.out.println(" 3顯示所有成績");
System.out.println(" 4輸入查詢個人成績");
System.out.println(" 5顯示各科平均分,最高分,最低分");
System.out.println(" 6退出成績管理系統(tǒng)");
System.out.println("----------學(xué)生成績管理系統(tǒng)----------");
System.out.println("請選擇菜單:");
int select=StudentManage.sc.nextInt();
return select;
}
//添加學(xué)生
public void addStudent(ArrayListstudents){Student student=new Student();
System.out.println("請輸入學(xué)生的學(xué)號");
student.setId(sc.nextLong());
System.out.println("請輸入學(xué)生的姓名");
student.setName(sc.next());
System.out.println("請輸入學(xué)生的應(yīng)用數(shù)學(xué)成績");
student.setMath(sc.nextDouble());
System.out.println("請輸入學(xué)生的大學(xué)英語成績");
student.setEnglish(sc.nextDouble());
System.out.println("請輸入學(xué)生的java程序設(shè)計成績");
student.setJava(sc.nextDouble());
System.out.println("請輸入學(xué)生的計算機(jī)應(yīng)用基礎(chǔ)成績");
student.setComputer(sc.nextDouble());
double avg = student.getAvg(student);
student.setAverage(avg);
students.add(student);
// 提示信息
System.out.println("添加成功");
}
//查詢學(xué)生
public void searchStudent(ArrayListstudents){if (students.size() == 0) {System.out.println("當(dāng)前無數(shù)據(jù),請?zhí)砑雍笾卦?);
} else {System.out.println("請輸入要查找學(xué)生的學(xué)號:");
long id = sc.nextLong();
int flag = -1;
Student student = new Student();
// 查找對應(yīng)學(xué)號,找到就退出
for (int i = 0; i< students.size(); i++) {student = students.get(i);
if (student.getId() == id) {flag = i;
break;
}
}
if (flag == -1) {System.out.println("未找到對應(yīng)學(xué)號的學(xué)生,請確認(rèn)后重新輸入!");
} else {System.out.println("對應(yīng)學(xué)號的學(xué)生成績?nèi)缦拢?);
System.out.println("學(xué)號\t\t\t姓名\t\t數(shù)學(xué)\t\t英語\t\tJava\t\tcomputer\t\t平均分\t\t");
System.out.format("%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getJava(),student.getComputer(), student.getAvg(student));
System.out.println("查找信息成功!");
}
}
}
//按平均分排降序
public void sortStudent(ArrayListstudents){if (students.isEmpty()) {System.out.println("當(dāng)前無數(shù)據(jù),請?zhí)砑雍笾卦?);
} else {for (int i = 0; i< students.size() - 1; i++) {if (students.get(i).getAvg(students.get(i))< students.get(i + 1).getAvg(students.get(i + 1))) {Student tmp = students.get(i);
students.set(i, students.get(i + 1));
students.set(i + 1, tmp);
}
}
System.out.println("排序后的學(xué)生成績");
System.out.println("學(xué)號\t\t姓名\t\t數(shù)學(xué)\t\t英語\t\tJava\t\t計算機(jī)\t\t平均分");
for (Student student : students) {System.out.format("%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t\n", student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getJava() ,student.getComputer(), student.getAvg(student));
}
}
}
//顯示所有成績
public void showAllStudent(ArrayListstudents){if (students.isEmpty()) {System.out.println("當(dāng)前無數(shù)據(jù),請先添加數(shù)據(jù)");
} else {System.out.println("----------所有學(xué)生成績?nèi)缦?---------");
System.out.println("學(xué)號\t\t姓名\t\t數(shù)學(xué)\t\t英語\t\tJava\t\t計算機(jī)\t\t平均分");
for (Student student : students) {System.out.format("%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getJava(),student.getComputer(), student.getAvg(student));
}
}
}
//各科平均分,最高分,最低分
public void averageScore(ArrayListstudents){int n = students.size();
double max1 = 0;
double min1 = students.get(0).getMath();;
double sum1 = 0;
for (int i = 0; i< n; i++) { sum1 = sum1 + students.get(i).getMath();
if (students.get(i).getMath() >max1) { max1 = students.get(i).getMath();
}
if (students.get(i).getMath()< min1) {min1 = students.get(i).getMath();
}
}
System.out.println("應(yīng)用數(shù)學(xué)的平均成績="+sum1/n+" 最高成績="+max1+" 最低成績="+min1);
double max2 = 0;
double min2 = students.get(0).getEnglish();;
double sum2 = 0;
for (int i = 0; i< n; i++) { sum2 = sum2 + students.get(i).getEnglish();
if (students.get(i).getEnglish() >max2) {max2 = students.get(i).getEnglish();
}
if (students.get(i).getEnglish()<= min2) {min2 = students.get(i).getEnglish();
}
}
System.out.println("大學(xué)英語的平均成績="+sum2/n+" 最高成績="+max2+" 最低成績="+min2);
double max3 = 0;
double min3 = students.get(0).getJava();;
double sum3 = 0;
for (int i = 0; i< n; i++) { sum3 = sum3 + students.get(i).getJava();
if (students.get(i).getJava() >max3) { max3 = students.get(i).getJava();
}
if (students.get(i).getJava()<= min3) {min3 = students.get(i).getJava();
}
}
System.out.println("Java的平均成績="+sum3/n+" 最高成績="+max3+" 最低成績="+min3);
double max4 = 0;
double min4 = students.get(0).getComputer();;
double sum4 = 0;
for (int i = 0; i< n; i++) { sum4 = sum4 + students.get(i).getComputer();
if (students.get(i).getEnglish() >max4) { max4 = students.get(i).getComputer();
}
if (students.get(i).getComputer()<= min4) {min4 = students.get(i).getComputer();
}
}
System.out.println("計算機(jī)應(yīng)用基礎(chǔ)的平均成績="+sum4/n+" 最高成績="+max4+" 最低成績="+min4);
}
}
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