public class Grade { private ：double english; double math; double Chinese; public：Grade(double english, double math, double Chinese) { this.english = english; this.math = math; this.Chinese = Chinese; } double sum() { return this.english+this.math+this.Chinese; } void displayTotal() { System.out.println(sum()); } double average()
{ return total()/3; } void displayAverage() { System.out.println(average()); } double getEnglish() { return english; } void setEnglish(double english) { this.english = english; } double getMath() { return math; } 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(70, 80, 90)); s.grade.printAverage(); s.grade.printTotal(); }}
原文：https://www.cnblogs.com/xxym/p/9101945.html