Question

我正在开发一个程序，它会将随机生成的数字添加到数组中。我需要能够跟踪在生成重复数字之前生成的数量。我有一个接口和ArrayIntLog类。该类包含一个int []。

在运行我的程序之前我得到一个错误，该程序说＆＃34;数组需要，找到了ArrayIntLog。如果我理解我做得对，ArrayIntLog将输入存储到数组日志中，但我不确定如何从我的TestLuck类访问该数组？我尝试过使用名称myLog [index]并只记录[index]但是这些也给我带来了错误。

这是我的TestLuck类：

package arrayintlog;

import java.util.Random;

public class TestLuck 
{

    public static void main(String[] args)
    {
        int cycles = 0;
        String name = "myLog";
        int min = 1;
        int max = 10000;
        int duplicateCheck;

        Random rand = new Random();
        int random = rand.nextInt(max - min + 1) + min;

        ArrayIntLog newLog = new ArrayIntLog(name);

        for (int index = 0; index < newLog.size(); index++)
        {
            newLog.insert(random);
            for(int index2 = 0; index2 < newLog.size(); index2++)
            {
                if (newLog[index].contains(newLog[index2]))
                {
                    System.out.println("You had to generate " + index + "numbers get a match");
                }
            }
        }

    }
}

这是我的ArrayIntLog类：

package arrayintlog;


public class ArrayIntLog implements IntLogInterface
{
    protected String name; //name of the IntLog
    protected int[] log; //array that holds the integers
    protected int lastIndex = -1;

    //==========================Constructor=====================================
    public ArrayIntLog(String name, int maxSize)
    {
        log = new int[maxSize];
        this.name = name;
    }

    //==========================Constructor=====================================
    public ArrayIntLog(String name)
    {
        log = new int[100];
        this.name = name;
    }

    //===========================Insert=========================================
    public void insert(int element) 
    {
        lastIndex++;
        log[lastIndex] = element;
    }

    //===========================isFull=========================================
    public boolean isFull() 
    {
        if(lastIndex == (log.length - 1))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    //============================Size==========================================
    public int size() 
    {
        return lastIndex + 1;
    }

    //===========================Contains=======================================
    public boolean contains(int element) 
    {
        int location = 0;
        while (location <= lastIndex)
        {
            if (element == (log[location]))
            {
                return true;
            }
            else
            {
                location++;
            }
        }
        return false;
    }

    /*=============================Clear========================================
    public void clear() 
    {
        for (int index = 0; index <= lastIndex; index++)
        {
            log[index] = null;
        }
        lastIndex = -1;
    }*/

    //=============================getName======================================
    public String getName() 
    {
        return name;
    }

    public String toString()
    {
        String logString = "Log " + name +"/n/n";

        for (int index = 0; index <= lastIndex; index++)
        {
            logString = logString + (index+1) + ". " +
                    log[index] + "/n";
        }
        return logString;
    }
}

这是我的IntLogInterface：

package arrayintlog;


public interface IntLogInterface 
{
    void insert(int element);
    //precondition: IntLog is not full
    //places element into the log

    boolean isFull();
    //returns true if the IntLog is full

    int size();
    //returns the number of elements in this IntLg

    boolean contains(int element);
    //return true if the IntLog contatains an element

    //void clear();
    //makes this IntLog empty

    String getName();
    //returns the name of this IntLog

    String toString();
    //returns a formatted string representing this IntLog 
}

Answer 1

如果您需要访问其他类的非公共变量，最好调用该变量的getter方法。

在ArrayIntLog类中添加： -

public int get(int index) {
        return log[index];
    }

并在主方法中将if条件更改为： -

if (newLog.get(index) == (newLog.get(index2)))
                {
                    System.out.println("You had to generate " + index + "numbers get a match");
                }

Answer 2

我没有编译你的代码，但我认为错误就在行中：if (newLog[index].contains(newLog[index2])) 你已经定义了类ArrayIntLog的对象：

ArrayIntLog newLog = new ArrayIntLog(name);

然后你试图通过调用它来访问它：newLog[index]它在Java中是非法的。您可能希望在接口类ArrayIntLog +中定义另一个方法，如下所示：

public class ArrayIntLog {

  ///...... the rest of the code:

  public int get(int index) {
    // you might want to check bound here as well, its your decision...
    return log[index];
  } 
}

这会让你对数组有所了解。顺便说一句，即使在这种情况下，这也是一个错误，因为你不能做if (newLog.get(index).contains(newLog.(index2)))之类的事情。我猜你是这个意思： if (newLog.contains(newLog[index2]))或者：if (newLog.get(index) == newLog[index2]))，我没有检查代码的逻辑。

BTW，只是一个建议，java编译器会生成相当不错的错误消息，你甚至应该有一行精确的代码，而编译无法完成它的工作。因此，阅读这些编译错误并尝试理解它们确实值得。

希望这有帮助

Answer 3

要从其他对象访问数组'log'的内容，'ArrayIntLog'类必须有一个公共方法，可以访问aray'log'。

例如：

将以下代码添加到'ArrayIntLog'类中，并添加“int getData（int index）;”进入IntLogInterface接口。

public getData(int index)
{
    return log(index);
}

然后，您可以从newLog对象的数组中获取数据，该对象是“ArrayIntLog”类的实例，如下所示。此示例访问数组的第三个元素。

  thirdDataInArray = newlog.getData(3);

在另一个类中访问数组？

3 个答案: