Java vs. C#

Indexer

Java
 
//Java doesn't have an indexer feature.
//You have to work around.
class IntIndexer
{
    private String[] myData;

    public IntIndexer(int size)
    {
        myData = new String[size];

        for (int i=0; i < size; i++)
        {
            myData[i] = "empty";
        }
    }

    public String get(int pos)
    {
        return myData[pos];
    }
    public void set(String s, int idx)
    {
       myData[idx] = s;
    }

    public static void main(String[] args)
    {
        int size = 10;

        IntIndexer myInd = new IntIndexer(size);

        myInd.set("Some Value",9);
        myInd.set("Another Value",3);
        myInd.set("Any Value",5);

        System.out.println("\nOutput:\n");

        for (int i=0; i < size; i++)
        {
           System.out.println("myInd["+i+"]: "+myInd.get(i));
        }
    
    }
}

Output:
myInd[0]: empty
myInd[1]: empty
myInd[2]: empty
myInd[3]: Another Value
myInd[4]: empty
myInd[5]: Any Value
myInd[6]: empty
myInd[7]: empty
myInd[8]: empty
myInd[9]: Some Value


//work around for overloaded indexer
class OvrIndexer
{
    private String[] myData;
	
    private int arrSize;

    public OvrIndexer(int size)
    {
        arrSize = size;
		
        myData = new String[size];

        for (int i=0; i < size; i++)
        {
            myData[i] = "empty";
        }
    }

    public String get(int pos)
    {
        return myData[pos];
    }
	
    public void  set(String value, int pos)
    {
        myData[pos] = value;
    }
   
    public int get(String data)
    {
        int count = 0;
		
        for (int i=0; i < arrSize; i++)
        {
           if (myData[i] == data)
           {
              count++;
           }
        }
        return count;
    }
	
    public void  set(String data, String replace)
    {
        for (int i=0; i < arrSize; i++)
        {
            if (myData[i] == data)
            {
               myData[i] = replace;
            }
        }
    }

    public static void main(String[] args)
    {
        int size = 10;
		
        OvrIndexer myInd = new OvrIndexer(size);

        myInd.set("Some Value",9);
        myInd.set("Another Value",3);
        myInd.set("Any Value",5);
		
        myInd.set("empty", "no value");

        System.out.println("\nOutput: \n");

        for (int i=0; i < size; i++)
        {
            System.out.println("myInd["+i+"]: " + myInd.get(i));
        }

        System.out.println("\nNumber of \"no value\" entries: "+
		                  myInd.get("no value"));
    }
}

Output:

myInd[0]: no value
myInd[1]: no value
myInd[2]: no value
myInd[3]: Another Value
myInd[4]: no value
myInd[5]: Any Value
myInd[6]: no value
myInd[7]: no value
myInd[8]: no value
myInd[9]: Some Value

Number of "no value" entries: 7

C#
 
using System;
class IntIndexer
{
    private string[] myData;

    public IntIndexer(int size)
    {
        myData = new string[size];

        for (int i=0; i < size; i++)
        {
            myData[i] = "empty";
        }
    }

    public string this[int pos]
    {
        get
       {
            return myData[pos];
        }
        set
       {
            myData[pos] = value;
        }
    }

    static void Main(string[] args)
    {
        int size = 10;

        IntIndexer myInd = new IntIndexer(size);

        myInd[9] = "Some Value";
        myInd[3] = "Another Value";
        myInd[5] = "Any Value";

        Console.WriteLine("\nOutput:\n");

        for (int i=0; i < size; i++)
        {
            Console.WriteLine("myInd[{0}]: {1}", i, myInd[i]);
        }
    }
}
Output:
myInd[0]: empty
myInd[1]: empty
myInd[2]: empty
myInd[3]: Another Value
myInd[4]: empty
myInd[5]: Any Value
myInd[6]: empty
myInd[7]: empty
myInd[8]: empty
myInd[9]: Some Value


//Overloaded Index
using System;
class OvrIndexer
{
    private string[] myData;
    private int arrSize;

    public OvrIndexer(int size)
    {
        arrSize = size;
        myData = new string[size];

        for (int i=0; i < size; i++)
        {
            myData[i] = "empty";
        }
    }

    public string this[int pos]
    {
        get
       {
            return myData[pos];
        }
        set
       {
            myData[pos] = value;
        }
    }

    public string this[string data]
    {
        get
       {
            int count = 0;
            for (int i=0; i < arrSize; i++)
            {
                if (myData[i] == data)
                {
                    count++;
                }
            }
            return count.ToString();
        }
        set
       {
            for (int i=0; i < arrSize; i++)
            {
                if (myData[i] == data)
                {
                    myData[i] = value;
                }
            }
        }
    }

    static void Main(string[] args)
    {
        int size = 10;
        OvrIndexer myInd = new OvrIndexer(size);

        myInd[9] = "Some Value";
        myInd[3] = "Another Value";
        myInd[5] = "Any Value";

        myInd["empty"] = "no value";

        Console.WriteLine("\nOutput:\n");

        for (int i=0; i < size; i++)
        {
            Console.WriteLine("myInd[{0}]: {1}", i, myInd[i]);
        }

        Console.WriteLine("\nNumber of \"no value\" entries: {0}", 
		            myInd["no value"]);
    }
}
Output:

myInd[0]: no value
myInd[1]: no value
myInd[2]: no value
myInd[3]: Another Value
myInd[4]: no value
myInd[5]: Any Value
myInd[6]: no value
myInd[7]: no value
myInd[8]: no value
myInd[9]: Some Value

Number of "no value" entries: 7