Question

Java新手在这里，我有一个任务，我需要编写一个类来创建学生对象，然后还写一个驱动程序。

我完成了所有要求，除了我遇到这个问题 - “写方法getTestScore接受测试编号并返回适当的分数。”

我相信我已经正确地编写了类，但是我在编写驱动程序代码时遇到了麻烦。

在提示用户输入测试编号后，它没有返回任何内容，程序终止返回适当的分数。

非常感谢帮助！

这是班级：

public class Student
{ 
    private String firstName, lastName;
    private String homeAddress, schoolAddress;
    private int testScore1, testScore2, testScore3;

    //Constructors
    public Student()
    {
        firstName = "None";
        lastName = "None";
        homeAddress = "None";
        schoolAddress = "None";
        testScore1 = 0;
        testScore2 = 0;
        testScore3 = 0;
    }

    public Student(String first, String last, String home, String school, int score1, int score2, int score3)
    {
        firstName = first;
        lastName = last;
        homeAddress = home;
        schoolAddress = school;
        testScore1 = score1;
        testScore2 = score2;
        testScore3 = score3;
    }

    //Setter for test scores
    public void setTestScore(int testNum, int score)
    {
        if (testNum == 1)
            testScore1 = score;
        else
            if (testNum == 2)
                testScore2 = score;
            else
              if (testNum == 3)
                testScore3 = score;
              else
                throw new IllegalArgumentException(testNum + " is out of range");
        }
    //Getter for test scores
    public int getTestScore(int testNum2)
    {
        if (testNum2 == 1)
            return testScore1;
        else
            if (testNum2 == 2)
                return testScore2;
            else
              if (testNum2 == 3)
                return testScore3;
              else
                throw new IllegalArgumentException(testNum2 + " is out of range");
        }
    //Calculates average for each student
    public int getAverage()
    {
        int average = (testScore1 + testScore2 + testScore3)/3;
        return average;
    }
    //Returns a description of this Student object
    public String toString()
    {
        String result;

        result = firstName + " " + lastName + "\n";
        result += "Home Address:\n" + homeAddress + "\n";
        result += "School Address:\n" + schoolAddress + "\n";
        result += "Test Score 1:\n" + testScore1 + "\n";
        result += "Test Score 2:\n" + testScore2 + "\n";
        result += "Test Score 3:\n" + testScore3 + "\n";
        result += "Average Test Score:\n" + ((testScore1+testScore2+testScore3)/3);

        return result;
    }
}

这是司机：

package lab7;

import java.util.Scanner;

public class StudentBody {

    public static void main(String[] args) 
    //Create student objects
    {
        Student snm24 = new Student("Sarah", "M", "18 79th Street", "5000 Forbes Ave.", 95, 80, 63);
        Student adk28 = new Student("Andrew", "K", "16 Collins Ave.", "16401 NW 37th Ave.", 90, 82, 76);

        //Get average for snm24
        snm24.getAverage();
        System.out.println("snm24 average initial: " + snm24.getAverage());

        //Set new test score for test 3 for snm24 and see new average
        snm24.setTestScore(3, 68);
        System.out.println("snm24 average after adjustment: " +snm24.getAverage());

        //Get test score for adk28
        Scanner scan = new Scanner(System.in);
        System.out.println("Which test score are you looking for?:");
        int testNum2 = scan.nextInt();
        adk28.getTestScore(testNum2);
    }
}

Answer 1

它没有返回任何内容，程序终止。非常感谢帮助！

这里＆gt;

adk28.getTestScore(testNum2);

返回的值会丢失..用它做一些事情，打印它，将它分配给变量：

int result =  adk28.getTestScore(testNum2);

接受Java中Getter类的用户输入

1 个答案: