Question

我的代码目前没有编译，我知道这是由于我的构造函数缺少返回 - 但如果我能得到一些帮助（因为我有一个我已经尝试修复的版本），它非常感谢。

我有2个文件，一个有构造函数，另一个访问该构造函数。我还应该注意，我在网上发现的所有帮助都说我必须使用if else语句，但这会导致更多错误。

我的主文件代码：

import java.util.Scanner;//importing scanner 

public class QuestionTwo {

  public static void main(String[] args) {
    int numberofDays;//these two lines define variables
    int sharePoints;

Scanner keyboard = new Scanner(System.in);//activating scanner
System.out.print("Number of days in the period: ");//asking question

numberofDays = keyboard.nextInt();//obtaining input by defining a variable as a keyboard input

System.out.print("Share points on the first day: ");//asking another question
sharePoints = keyboard.nextInt();//obtaining input by defining a variable as a keyboard input
while (numberofDays < 10 || numberofDays > 20)
{
    System.out.println("The number of days doesn’t meet the required criteria, enter it again");
    System.out.print("Number of days in the period: ");
    numberofDays = keyboard.nextInt();
}

SharePattern share = new SharePattern(numberofDays, sharePoints);
SharePattern.outPutTablePrinter(numberofDays, sharePoints);
//above two lines print day and share points, as well as the first line 
of text (as it does not change)


}

}

以下是构造函数的代码（具有返回错误的代码）：

public class SharePattern {
   private static int days;
   private static int share;

public SharePattern(int numberofDays, int sharePoints)//constructor
{
 numberofDays=days;
 sharePoints=share;

}
public static int outPutTablePrinter(int numberofDays,int sharePoints){

    for (int i = 2; i <= days; i++) {
        if (days % 2 == 0)
            if (i <= days / 2) {
                share = share + 50;
            } else {
                share = share - 25;

            } else {
            if (i <= days / 2 + 1) {
                share = share + 50;
            } else {
                share = share - 25;
            }
        }
    }
    System.out.println("The share points on the final day would be: "+share);
}
}
}

任何帮助都会受到赞赏，因为我整天都在研究这个问题，最后在我遇到这个问题时就完成了。

Answer 1

首先，您有else {} else，这是无效的

不太清楚你想要完成哪个......

选项1

删除构造函数和静态字段。你永远不会使用share变量。

使outPutTablePrinter方法使用您传递给它的参数。而且这种方法不会返回任何内容。它正在打印一个值。设为public static void

选项2

如果要保留构造函数，则需要翻转这些相等语句的顺序并删除static关键字。

仍然使方法无效

public class SharePattern {
    private int days;
    private int share;

    public SharePattern(int numberofDays, int sharePoints){
        days = numberofDays;
        share = sharePoints;
    }

    public void outPutTablePrinter() {

在主要方法中，您必须使用share.outPutTablePrinter()

Answer 2

实际上非常简单（对不起我的无能）：

我应该放

return (sharePoints);

我之前什么都没有

Answer 3

如果我理解你的代码

，这就是我的建议

<强> SharePattern.class

private static int days;
private static int share;

public SharePattern(int numberofDays, int sharePoints)//constructor
{
    days=numberofDays;
    share=sharePoints;

}
public static void outPutTablePrinter(){

    for (int i = 2; i <= days; i++) {
        if (days % 2 == 0)
            if (i <= days / 2) {
                share = share + 50;
            } else {
                share = share - 25;
            }
        else
            if (i <= days / 2 + 1) {
                share = share + 50;
            } else {
                share = share - 25;
            }
    }
    System.out.println("The share points on the final day would be: "+share);
}

方法和构造函数实现

3 个答案:

选项1

选项2