SoftEngProj/Helpers.java at master · panaman67/SoftEngProj · GitHub

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public class Helpers
{
	static boolean isInteger(String str)
	{
		try
		{
			int d = Integer.parseInt(str);
		}
		catch(NumberFormatException nfe)
		{
			return false;
		}
		return true;
	}

	static int extractUnsignedInt(String input)
	{
		try
		{
			int num = Integer.parseUnsignedInt(input);
			return num;
		}
		catch (NumberFormatException e)
		{
			System.err.println("Invalid input");
			return -1;
		}
	}

	static int extractUnsignedInt(String input, int maxValue)
	{
		try
		{
			int num = Integer.parseUnsignedInt(input);
			if (num <= maxValue)
				return num;
			return -1;
		}
		catch (NumberFormatException e)
		{
			System.err.println("Invalid input");
			return -1;
		}
	}

	static int extractInt(String input, int maxValue)
	{
		try
		{
			int num = Integer.parseInt(input);
			if (num <= maxValue)
				return num;
			return -1;
		}
		catch (NumberFormatException e)
		{
			System.err.println("Invalid input");
			return -1;
		}
	}
}