Variable Length Array in Java

This Java program is to Implement Variable length array. In programming, a variable-length array (or VLA) is an array data structure of automatic storage duration whose length is determined at run time (instead of at compile time).

Here is the source code of the Java program to implement variable length array. The Java program is successfully compiled and run on a Linux system. The program output is also shown below.

```
import java.util.ArrayList;
```
```
import java.util.Scanner;
```
```
 
```
```
public class VariableLengthArray<T>
```
```
{
```
```
    private volatile int size;
```
```
    private ArrayList<T> array;
```
```
 
```
```
    public VariableLengthArray()
```
```
    {
```
```
        array = new ArrayList<T>();
```
```
        setSize(-1);
```
```
    }
```
```
 
```
```
    public void setSize(int size)
```
```
    {
```
```
        this.size = size;
```
```
    }
```
```
 
```
```
    public int getSize()
```
```
    {
```
```
        return size;
```
```
    }
```
```
 
```

    public void store(int index, T value)

```
    {
```
```
        try 
```
```
        {
```
```
            array.set(index, value);
```

        } catch (IndexOutOfBoundsException indexOutBounds)

```
        {
```

            if (index >= 0 && !(index < size))

```
            {
```

                throw new IndexOutOfBoundsException();

```
            }
```
```
            array.add(index, value);
```
```
        }
```
```
    }
```
```
 
```
```
    public T get(int index)
```
```
    {
```
```
        try
```
```
        {
```

            if (index >= 0 && index < size)

                return array.get(index);

```
            else
```

                throw new IndexOutOfBoundsException();

        } catch (IndexOutOfBoundsException indexOutBounds)

```
        {
```

            System.out.println("INDEX OUT OF BOUNDS : the specified index is

                     more than the size of the  array");

```
        }
```
```
        return null;
```
```
    }
```
```
 
```
```
    public T remove(int index)
```
```
    {
```
```
        try 
```
```
        {
```

            if (index >= 0 && index < size)

```
            {
```
```
                size--;
```

                return array.remove(index);

```
            } else
```

            throw new IndexOutOfBoundsException();

        } catch (IndexOutOfBoundsException indexOutBounds)

```
        {
```

            System.out.println("INDEX OUT OF BOUNDS : the specified index

                        is more than the size of the array");

```
        }
```
```
        return null;
```
```
    }
```
```
 
```

    public static void main(String... arg)

```
    {
```
```
        int size, value;
```
```
        String choice;
```

        Scanner scanner = new Scanner(System.in);

```
 
```

        VariableLengthArray<Integer> integersArray = new VariableLengthArray<Integer>();

```
 
```
```
        do
```
```
        {
```

            System.out.println("Enter the size of the array");

```
            size = scanner.nextInt();
```
```
 
```

            integersArray.setSize(size);

            System.out.println("Enter the values of the array");

            for (int index = 0; index < integersArray.getSize(); index++)

```
            {
```

                value = scanner.nextInt();

                integersArray.store(index, value);

```
            }
```
```
 
```

            System.out.println("The Values entered are ");

            for (int index = 0; index < integersArray.getSize(); index++)

```
            {
```

                System.out.print(integersArray.get(index) + "\t");

```
            }
```
```
 
```

            System.out.println("\nEnter more values ?[y/n]");

```
            choice = scanner.next();
```
```
        } while (choice.equals("y"));
```
```
        scanner.close();
```
```
    }
```
```
}
```

$javac VariableLengthArray.java
$java VariableLengthArray
 
Enter the size of the array
5
Enter the values of the array
10 9 8 7 6 
The Values entered are 
10	9	8	7	6	
Enter more values ?[y/n]
y
Enter the size of the array
3
Enter the values of the array
2 3 4 
The Values entered are 
2	3	4

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