java - 如何使用整数值来表示上涨或下跌？

Question

我正在编写一种方法，通过将运行放入 ArrayList<Integer> 中来查找 .txt 文件中的运行。 。我很困惑如何用 int 来指示运行是向上还是向下值。

我得到了这个伪代码来提示:

Method FindRuns(In: pList is ArrayList of Integers; int pDir is RUNS_UP or RUNS_DN) Returns ArrayList of Integers

到目前为止我有的方法:

private ArrayList<Integer> FindRuns(ArrayList<Integer> pList, int pDir)

然后，伪代码会提示一系列有关 pDir 是 RUNS_UP 还是 RUNS_DN 的 else/if 语句。我不确定此时该怎么办。

这是完整的伪代码:

Method FindRuns(In: pList is ArrayList of Integers; int pDir is RUNS_UP or RUNS_DN) Returns ArrayList of Integers 
    listRunsCount ← arrayListCreate(pList.size(), 0)
    Declare int varaibles i ← 0, k ← 0
    While i < pList.size() - 1 Do 
        If pDir is RUNS_UP and pList element at i is  ≤ pList element at i + 1 Then
            Increment k
        Else If pDir is RUNS_DN and pList element at i is  ≥ pList element at i + 1 Then
            Increment k
        Else If k  0 ≠ Then
            Increment the element at index k of listRunsCount
            k ← 0
        End If
        Increment i
    End While

    If k  0 ≠ Then 
        Increment the element at index k of listRunsCount
    End If

    Return listRunsCount 

End Method FindRuns

Answer 1

您的程序可能应该定义常量，如下所示:

public class TheProgram
{
    public static final int RUNS_UP = 1;
    public static final int RUNS_DOWN = 2;

    // place the method you are writing here
}

然后您可以在您的方法中使用它们，如下所示:

if (pDir == RUNS_UP)
{
    // runs up
}

和

if (pDir == RUNS_DOWN)
{
    // runs down
}