StudentTester主类

Question

我正在尝试在java中编写一个程序，该程序需要3个学生的姓名和分数，然后计算他们的分数的平均值。以下是我想要实现的详细清单：

修改Student类，使其具有三个类型为int的新实例变量，分别为score1，score2和score3。
修改Student类，使其名为averageScore，返回一个int值，该值是这三个得分的平均值。
修改方法main，为您已创建的每个学生对象输入三个分数。
打印每个学生的姓名，然后将他们的平均分数作为整数。

StudentTester主类

import javax.swing.JOptionPane;

public class StudentTester {

    public static void main(String args[]) {
        Student student1 = new Student();
        Student student2 = new Student();
        Student student3 = new Student();


        String firstName;
        String lastName;

        //start first student here 
        firstName = JOptionPane.showInputDialog("Enter the student's first name.");
        student1.setFirstName(firstName);

        lastName = JOptionPane.showInputDialog("Enter the student's last name.");
        student1.setLastName(lastName);

        JOptionPane.showMessageDialog(null, "Student 1 has name "
                + student1.getFirstName() + ""+ student1.getLastName() + ".");

        score1 = JOptionPane.showInputDialog("Enter the student's score.");
        student1.setScore(score1);
            int student1; getScore();

        //start second student here
        firstName = JOptionPane.showInputDialog("Enter the student's first name.");
        student2.setFirstName(firstName);

        lastName = JOptionPane.showInputDialog("Enter the student's last name.");
        student2.setLastName(lastName);

        JOptionPane.showMessageDialog(null, "Student 2 has name "
                + student2.getFirstName() + "" + student2.getLastName() + ".");

        score2 = JOptionPane.showInputDialog("Enter the student's score. ");
        student2.setScore(score2);

        //start third student here
        firstName = JOptionPane.showInputDialog("Enter the student's first name.");
        student3.setFirstName(firstName);

        lastName = JOptionPane.showInputDialog("Enter the student's last name.");
        student3.setLastName(lastName);

        JOptionPane.showMessageDialog(null, "Student3 has name "
                + student3.getFirstName() + "" + student1.getLastName() + ".");

        //average score


            }
        }

学生班

public class Student {

    private String firstName;
    private String lastName;
    public int score1;
    public int score2;
    public int score3;

    public void setFirstName(String name){
        firstName = name;
    }
    public String getFirstName(){
        return firstName;
    }
    public void setLastName(String name){
        lastName = name;
    }
    public String getLastName(){
        return lastName;
    }

    public String setScore(){
        int score1 = Integer.parseInt(score1Store);
    }

    //method for average score computation
    public void score1 = Integer.parseInt(Score);

    public double getAverageScore(){
        return double = ( score1 + score2 + score3)/3.0;

    }
}

我做错了什么？我完全迷失了，并且不确定如何设置整个分数输入和计算。

感谢。

Answer 1

在学生中，你应该将score1，score2和score3作为私有实例变量放在顶部，并为他们设置getter和setter，就像你对firstName和lastName所做的那样。你可以为每个人设置单独的getter和setter，但有多种方法可以做到这一点。

您可以从getAverageScore返回一个int值，如：

public int getAverageScore() {
    float ans = (score1 + score2 + score3)/3.0f;
    return Math.round(ans);

我使用了一个浮点数，因为带有double的Math.round将返回一个long。

在main方法中，您可以使用setScores（）方法设置分数。

student1.setScore1(score1);
student1.setScore2(score2);
student1.setScore3(score3);

要打印学生，您可以在学生中创建一个toString方法，或者使用您的getter打印它们。 toString方法如下所示：

public String toString() {
    return firstName + " " + lastName + " " + score1 + " " + score2 + " " + score3;
}

java-返回平均得分的整数值？

StudentTester主类

学生班

1 个答案: