java小实验-初步使用类

定义一个学生类，包含的成员有：姓名，学号，绩优成绩，总人数，平均绩优成绩等数据成员，和数据的getter 和setter方法，以及toString 方法，合理使用 public, private, static,final等限定词。主函数中创建５个学生对象，输出每个学生的个性信息，以及全部学生对象的全局信息。

Student.java

public class Student {  
    private String name;  
    private String id;  
    private double score;  
    private static int total;  
    private static double average;  
  
    Student(String name, String id, double score) {  
        this.name = name;  
        this.id = id;  
        this.score = score;  
        average = (average * total++ + score) / total;  
    }  
  
    public String GetName(){  
        return this.name;  
    }  
  
    public String GetId(){  
        return this.id;  
    }  
  
    public double GetScore(){  
        return this.score;  
    }  
  
    public void SetName(String name){  
        this.name = name;  
    }  
  
    public void SetId(String id){  
        this.id = id;  
    }  
  
    public void SetScore(double score){  
        var lastScore = this.score;  
        average =  (average * total - lastScore + score) / total;  
        this.score = score;  
    }  
  
    public int GetCount(){  
        return total;  
    }  
  
    public double GetAverage(){  
        return average;  
    }  
  
    @Override  
    public String toString(){  
        return String.format("学号%s 姓名%s 成绩%f", GetId(), GetName(), GetScore());  
    }  
}

Main.java

public class Main {  
    public static void main(String[] args) {  
        var student1 = new Student("test1", "114514", 60.1);  
        System.out.println(student1.toString());  
  
        var student2 = new Student("test2", "114514", 60.1);  
        student2.SetId("1919810");  
        System.out.println(student2.toString());  
  
        var student3 = new Student("test3", "114514", 60.1);  
        System.out.println(student3.toString());  
  
        var student4 = new Student("test4", "114514", 60.1);  
        System.out.println(student4.toString());  
  
        var student5 = new Student("test5", "114514", 60.1);  
        System.out.println(student5.toString());  
  
        System.out.println("平均成绩 " + student1.GetAverage());  
        student3.SetScore(80.5);  
        System.out.println("平均成绩 " + student1.GetAverage());  
    }  
}