Tamanho da Matriz

public class Teste
{
	public static void main(String[] args)
	{
		int numColunas = 5;
		
		int a[][] = { {11,12,13,14,15} ,{21,22,23,24,25} ,{31,32,33,34,35} };
		
		for (int i = 0; i < a.length; i++)
			for (int j = 0; j < numColunas; j++)
				System.out.println(a[i][j]);
	}
}