学生成绩管理

public class Grade {
    private double english;
    private double math;
    private double chinese;
     
    public Grade(double english, double math, double chinese) {
        this.english = english;
        this.math = math;
        this.chinese = chinese;
    }
 
    public double total() {
        return english + math + chinese;
    }
     
    public void printTotal() {
        System.out.println(total());
    }
     
    public double average() {
        return total() / 3;
    }
     
    public void printAverage() {
        System.out.println(average());
    }
    public double getEnglish() {
        return english;
    }
 
    public void setEnglish(double english) {
        this.english = english;
    }
 
    public double getMath() {
        return math;
    }
 
    public void setMath(double math) {
        this.math = math;
    }
 
    public double getChinese() {
        return chinese;
    }
 
    public void setChinese(double chinese) {
        this.chinese = chinese;
    }
}



public class Student {
    String name;
    Grade grade;
    public Student(String name, Grade grade) {
        this.name = name;
        this.grade = grade;
    }
     
    public static void main(String[] args) {
        Student s = new Student("Cici", new Grade(75, 88, 92));
        s.grade.printAverage();
        s.grade.printTotal();
    }
}

实验结果:

     85.0

     255.0