Decimal to roman numeral converter in java

Java program for Decimal to roman numeral converter. Here more solutions.

/*
  Java program for
  Conversion from Decimal to roman number
*/
public class Perform
{
	// Display roman value of n
	public static void result(int n)
	{
		switch (n)
		{
			// Test Cases
			case 1:
				System.out.print("I");
				break;
			case 4:
				System.out.print("IV");
				break;
			case 5:
				System.out.print("V");
				break;
			case 9:
				System.out.print("IX");
				break;
			case 10:
				System.out.print("X");
				break;
			case 40:
				System.out.print("XL");
				break;
			case 50:
				System.out.print("L");
				break;
			case 90:
				System.out.print("XC");
				break;
			case 100:
				System.out.print("C");
				break;
			case 400:
				System.out.print("CD");
				break;
			case 500:
				System.out.print("D");
				break;
			case 900:
				System.out.print("DM");
				break;
			case 1000:
				System.out.print("M");
				break;
		}
	}
	public static long select(long number, int[] collection, int size)
	{
		int n = 1, i = 0;
		for (i = 0; i < size; ++i)
		{
			if (number >= collection[i])
			{
				n = collection[i];
			}
			else
			{
				break;
			}
		}
		result(n);
		// Reduce the value of number
		return number - n;
	}
	public static void romanNo(long number)
	{
		if (number <= 0)
		{
			// When is not a natural number
			return;
		}
		// Base case collection
		int[] collection = {
			1,
			4,
			5,
			9,
			10,
			40,
			50,
			90,
			100,
			400,
			500,
			900,
			1000
		};
		// Get the size of collection
		int size = collection.length;
		System.out.print(" " + number + " : ");
		while (number > 0)
		{
			number = select(number, collection, size);
		}
        // Add new line
		System.out.println();
	}
	public static void main(String[] args)
	{
		// Test Case
		romanNo(10);
		romanNo(18);
		romanNo(189);
		romanNo(604);
		romanNo(982);
		romanNo(3000);
	}
}

Output

 10 : X
 18 : XVIII
 189 : CLXXXIX
 604 : DCIV
 982 : DMLXXXII
 3000 : MMM