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接口的综合案例

news 2026/4/14 22:26:06

1.题目要求

2.解题

1.首先我们写一个学生类，用来描述学生的相关信息

public class Student {
private String name;
private char sex;
private double score;

public Student() {
}

public Student(String name, char sex, double score) {
this.name = name;
this.sex = sex;
this.score = score;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public char getSex() {
return sex;
}

public void setSex(char sex) {
this.sex = sex;
}

public double getScore() {
return score;
}

public void setScore(double score) {
this.score = score;
}
}

2.接着，写一个StudentOperator接口，表示学生信息管理系统的两个功能。

public interface StudentOperator { void printAllInfo(ArrayList<Student> students); void printAverageScore(ArrayList<Student> students); }

3.然后，写一个StudentOperator接口的实现类StudentOperatorImpl1，采用第1套方案对业务进行实现。

public class StudentOperatorImpl1 implements StudentOperator{ @Override public void printAllInfo(ArrayList<Student> students) { System.out.println("----------全班全部学生信息如下--------------"); for (int i = 0; i < students.size(); i++) { Student s = students.get(i); System.out.println("姓名：" + s.getName() + ", 性别：" + s.getSex() + ", 成绩：" + s.getScore()); } System.out.println("-----------------------------------------"); }  @Override public void printAverageScore(ArrayList<Student> students) { double allScore = 0.0; for (int i = 0; i < students.size(); i++) { Student s = students.get(i); allScore += s.getScore(); } System.out.println("平均分：" + (allScore) / students.size()); } }

4.接着，再写一个StudentOperator接口的实现类StudentOperatorImpl2，采用第2套方案对业务进行实现。

public class StudentOperatorImpl2 implements StudentOperator{ @Override public void printAllInfo(ArrayList<Student> students) { System.out.println("----------全班全部学生信息如下--------------"); int count1 = 0; int count2 = 0; for (int i = 0; i < students.size(); i++) { Student s = students.get(i); System.out.println("姓名：" + s.getName() + ", 性别：" + s.getSex() + ", 成绩：" + s.getScore()); if(s.getSex() == '男'){ count1++; }else { count2 ++; } } System.out.println("男生人数是：" + count1 + ", 女士人数是：" + count2); System.out.println("班级总人数是：" + students.size()); System.out.println("-----------------------------------------"); }  @Override public void printAverageScore(ArrayList<Student> students) { double allScore = 0.0; double max = students.get(0).getScore(); double min = students.get(0).getScore(); for (int i = 0; i < students.size(); i++) { Student s = students.get(i); if(s.getScore() > max) max = s.getScore(); if(s.getScore() < min) min = s.getScore(); allScore += s.getScore(); } System.out.println("学生的最高分是：" + max); System.out.println("学生的最低分是：" + min); System.out.println("平均分：" + (allScore - max - min) / (students.size() - 2)); } }

5.再写一个班级管理类ClassManager，在班级管理类中使用StudentOperator的实现类StudentOperatorImpl1对学生进行操作

public class ClassManager { private ArrayList<Student> students = new ArrayList<>(); private StudentOperator studentOperator = new StudentOperatorImpl1();  public ClassManager(){ students.add(new Student("迪丽热巴", '女', 99)); students.add(new Student("古力娜扎", '女', 100)); students.add(new Student("马尔扎哈", '男', 80)); students.add(new Student("卡尔扎巴", '男', 60)); }  // 打印全班全部学生的信息 public void printInfo(){ studentOperator.printAllInfo(students); }  // 打印全班全部学生的平均分 public void printScore(){ studentOperator.printAverageScore(students); } }

6.最后，再写一个测试类Test，在测试类中使用ClassMananger完成班级学生信息的管理。

public class Test { public static void main(String[] args) { // 目标：完成班级学生信息管理的案例。 ClassManager clazz = new ClassManager(); clazz.printInfo(); clazz.printScore(); } }

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