班级学生全部信息管理小项目

需求：

设计一个班级学生的信息管理模块： 学生的数据有：姓名、性别、成绩

1. 功能：要求打印出全部学生的信息；
2. 功能：要求打印出全班学生的平均成绩。

方案：

1. 能打印出班级全部学生的信息；能打印班级全部学生的平均分。
2. 能打印出班级全部学生的信息（包括男女人数）；能打印班级全部学生的平均分（要求去掉最高分、最低分）

思路：
首先创建一个学生类(Student)和打印在控制台输出的测试类(StudentTest),再创建一个班级类(classManage),接着再创建一个接口类(StudentOperator),最后再创建两个类
(StudentOperatorImpl2)和(StudentOperatorImpl2)
来实现接口

**代码**

学生类

package src.stu.day10;

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 char getSex() {
        return sex;
    }

    public double getScore() {
        return score;
    }
}

测试类

package src.stu.day10;

public class StudentTest {
    public static void main(String[] args) {
        ClassManager clazz = new ClassManager();
        clazz.printInfo();
        clazz.printScore();
    }
}

班级类

package src.stu.day10;

import java.util.ArrayList;

public class ClassManager {

    private ArrayList<Student> students = new ArrayList<>();
//    private StudentOperatorImpl1 studentOperator = new StudentOperatorImpl1();
    private StudentOperator studentOperator = new StudentOperatorImpl2();
    public ClassManager(){
        students.add(new Student("吴文保",'男',100));
        students.add(new Student("徐博",'男',90));
        students.add(new Student("门玉明",'男',94));
        students.add(new Student("邓文柱",'男',98));
        students.add(new Student("小红",'女',92));
    }
    //打印全部班级学生信息
    public void printInfo(){
        studentOperator.printAllInfo(students);

    }
    //打印全部学生的平均分
    public void printScore(){
        studentOperator.printAvgScore(students);
    }
}

接口类

package src.stu.day10;

import java.util.ArrayList;

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

    void printAvgScore(ArrayList<Student> students);
}

接口的子类，也就是实现接口的类

• 1

package src.stu.day10;

import java.util.ArrayList;

public class StudentOperatorImpl1 implements StudentOperator{

    /**
     * @param students
     */
    @Override
    public void printAllInfo(ArrayList<Student> students) {
        System.out.println("--------全班学生信息如下--------");
        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("-----------------------------");
    }

    /**
     * @param students
     */
    @Override
    public void printAvgScore(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());
    }
}

• 2

package src.stu.day10;

import java.util.ArrayList;

public class StudentOperatorImpl2 implements StudentOperator{

    /**
     * @param students
     */
    @Override
    public void printAllInfo(ArrayList<Student> students) {
        System.out.println("--------全班学生信息如下--------");
        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  + ",女生人数是："+ count2);
        System.out.println("班级总人数是："+ students.size());
        System.out.println("-----------------------------");
    }

    /**
     * @param students
     */
    @Override
    public void printAvgScore(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();
            } else 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));
    }
}