Question

我目前正在进行自学课程，需要为以下代码编写测试程序，并通过为成员字段分配不同的值来重复步骤。

public class DayTwo {

public static void main(String[] args) {
    // TODO Auto-generated method stub
}
    public void displayDay() {
        int dayNumber = 1;
        if (dayNumber  == 1) {
            System.out.println("Monday");
        } else if (dayNumber == 2) {
            System.out.println("Tuesday");
        } else if (dayNumber == 3) {
            System.out.println("Wednesday");
        } else if (dayNumber == 4) {
            System.out.println("Thursday");
        } else if (dayNumber == 5) {
            System.out.println("Friday");
        } else if (dayNumber == 6) {
            System.out.println("Saturday");
        } else if (dayNumber == 7) {
            System.out.println("Sunday");
        } else {
            System.out.println(dayNumber + " entered. This is not a valid date.");
        }
    }

}

有人可以帮忙吗？

Answer 1

int dayNumber = 1;它是硬编码值，并且始终满足跳过其余语句的第一个条件，而不是使用Scanner或BufferedInputStream

进行输入

Scanner sc = new Scanner(System.in);
int dayNumber = sc.nextInt();

Answer 2

首先，所有不运行的类不带主方法。您的代码的另一个错误是它将始终打印“星期一”。用于制作测试类

public class Test{

  public static void main(String[] args){
     DayTwo dayTwo = new DayTwo();
     dayTwo. displayDay();
  }
}

Answer 3

像这样......

import java.util.*;

public class DayTwo 
{

    public static void main(String[] args) 
    {
        int number,choice=1;
        Scanner sc = new Scanner(System.in);
        while(choice!=0)
        {
            System.out.println("Enter the day number: ");
            number=sc.nextInt();
            displayDay(number);
            System.out.println("Press 0 to exit, 1 to continue:");
            choice=sc.nextInt();
        }
     }

    public static void displayDay(int dayNumber) 
    {

    if (dayNumber  == 1) {
        System.out.println("Monday");
        } else if (dayNumber == 2) {
        System.out.println("Tuesday");
        } else if (dayNumber == 3) {
        System.out.println("Wednesday");
        } else if (dayNumber == 4) {
        System.out.println("Thursday");
        } else if (dayNumber == 5) {
        System.out.println("Friday");
        } else if (dayNumber == 6) {
        System.out.println("Saturday");
        } else if (dayNumber == 7) {
        System.out.println("Sunday");
        } else {
        System.out.println(dayNumber + " entered. This is not a valid date.");
        }
    }
}

Answer 4

如果您想纯粹测试您的代码，请从DayTwo中删除public static void main(String[] args){}，因为它不需要，并使用以下Test类：

public class TestDay2 {
public static void main(String[] args) {
    DayTwo example = new DayTwo();
    example.displayDay();
    }
}

然而，由于dayNumber是硬编码的，因此总是打印'Monday'。你必须改变它来测试每个if语句，因为我认为你还没有接触过循环。

Answer 5

要按照说明，只需剪切并粘贴dayNumber声明，使其成为成员字段（class声明和main声明之间）。然后在new DayTwo中创建main，您可以将dayNumber分配给不同的内容并打印出来。

public class DayTwo {

    // now a dayNumber belongs to every DayTwo object
    int dayNumber = 1;

    // main is static and belongs to the DayTwo class
    public static void main(String[] args) {

        // make a new DayTwo object
        DayTwo days = new DayTwo();

        // displays Monday
        days.displayDay();

        days.dayNumber = 4;

        // displays Thursday
        days.displayDay();

        for (int i = 1; i <= 7; i++) {
            days.dayNumber = i;

            // displays all days
            days.displayDay();
        }
    }

    public void displayDay() {
        if (dayNumber  == 1) {
            System.out.println("Monday");
        } else if (dayNumber == 2) {
            System.out.println("Tuesday");
        } else if (dayNumber == 3) {
            System.out.println("Wednesday");
        } else if (dayNumber == 4) {
            System.out.println("Thursday");
        } else if (dayNumber == 5) {
            System.out.println("Friday");
        } else if (dayNumber == 6) {
            System.out.println("Saturday");
        } else if (dayNumber == 7) {
            System.out.println("Sunday");
        } else {
            System.out.println(dayNumber + " entered. This is not a valid date.");
        }
    }

}

你不需要比这更复杂的东西。

写一个测试类

5 个答案: