怎么在键盘上输入被private定义变量的值

Question

问题遇到的现象和发生背景

学生的成绩只能在一开始定义，不知道怎么修改成从电脑上输入，成绩只能是固定的值
（刚学java，可以的话麻烦解释得详细点）

问题相关代码，请勿粘贴截图

package 父类与子类声明;
class Student implements Comparable{
public Student(String no, String name) {
this.no = no;
this.name = name;
}
public Student() {
}
public Student(String no, String name, double english, double maths,
double computer, double sum) {
this.no = no;
this.name = name;
this.english = english;
this.maths = maths;
this.computer = computer;
this.sum = sum;
}

 private String no;
 private String name;
 private double english;
 private double maths;
 private double computer;
 private Double sum=0.0;
 public String getNo() {
  return no;
 }
 public void setNo(String no) {
  this.no = no;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public double getEnglish() {
  return english;
 }
 public void setEnglish(double english) {
  this.english = english;
  sum+=english;
 }
 public double getMaths() {
  return maths;
 }
 public void setMaths(double maths) {
  this.maths = maths;
  sum+=maths;
 }
 public double getComputer() {
  return computer;
 }
 public void setComputer(double computer) {
  this.computer = computer;
  sum+=computer;
 }
 public Double getSum() {
  return sum;
 }
 public void setSum(Double sum) {
  this.sum = sum;
 }
 public String toString() {
  return "学号："+no+"\t姓名\t"+name+"\t英语\t"+english+"\t数学\t"+maths+"\t计算机\t"+computer+"\t总成绩\t"+sum;
 }
 public int compareTo(Object o) {
  return sum.compareTo(((Student)o).getSum());
 }
 public Double sum(){
  return english+maths+computer;
 }
 public Double testScore(){
  return sum/3;
 }
}

class StudentXW extends Student{
 public StudentXW(String no, String name) {
  super(no,name);
 }
 public StudentXW() {
  super();
 }
 private String duty;

 public String getDuty() {
  return duty;
 }

 public void setDuty(String duty) {
  this.duty = duty;
 }
 public Double testScore() {
  return super.testScore()+3;
 }
}

 class StudentBZ extends Student{
 public StudentBZ(String no, String name) {
  super(no,name);
 }
 public StudentBZ() {
  super();
 }
 private String duty;

 public String getDuty() {
  return duty;
 }

 public void setDuty(String duty) {
  this.duty = duty;
 }
 public Double testScore() {
  return super.testScore()+5;
 }
}

public class test {
 public static void main(String[] args) {
  Student student1=new Student("001","小明");
  student1.setEnglish(60.0);
  student1.setMaths(60.0);
  student1.setComputer(60.0);
  System.out.println(student1+"\t测试成绩是\t"+student1.testScore());
  Student student2=new StudentXW("002","小李");
  student2.setEnglish(70.0);
  student2.setMaths(70.0);
  student2.setComputer(70.0);
  System.out.println(student2+"\t测试成绩是\t"+student2.testScore());
  Student student3=new StudentBZ("003"," 小王");
  student3.setEnglish(80.0);
  student3.setMaths(80.0);
  student3.setComputer(80.0);
  System.out.println(student3+"\t测试成绩是\t"+student3.testScore());
 }
}

运行结果及报错内容

学号：001 姓名 小明 英语 60.0 数学 60.0 计算机 60.0 总成绩 180.0 测试成绩是 60.0
学号：002 姓名 小李 英语 70.0 数学 70.0 计算机 70.0 总成绩 210.0 测试成绩是 73.0
学号：003 姓名 小王 英语 80.0 数学 80.0 计算机 80.0 总成绩 240.0 测试成绩是 85.0

我的解答思路和尝试过的方法

我想要达到的结果

学生的成绩可以从电脑上输入，而不是一直固定不变的

Answer 1

public class test {
 public static void main(String[] args) {
  Scanner in=new Scanner(System.in);
  Student student1=new Student("001","小明");
  student1.setEnglish(in.nextDouble());
  student1.setMaths(in.nextDouble());
  student1.setComputer(in.nextDouble());
  System.out.println(student1+"\t测试成绩是\t"+student1.testScore());
  Student student2=new StudentXW("002","小李");
  student2.setEnglish(in.nextDouble());
  student2.setMaths(in.nextDouble());
  student2.setComputer(in.nextDouble());
  System.out.println(student2+"\t测试成绩是\t"+student2.testScore());
  Student student3=new StudentBZ("003"," 小王");
  student3.setEnglish(in.nextDouble());
  student3.setMaths(in.nextDouble());
  student3.setComputer(in.nextDouble());
  System.out.println(student3+"\t测试成绩是\t"+student3.testScore());
 }
}