running balance does not update - newbie question

[capricorn86]

	public static void main(String[] args) 
	{
		double runningBalance = 0;
		
		blah(runningBalance);
		
		System.out.println(runningBalance);

	}

	private static void blah(double runningBalance) 
	{
		runningBalance += 8;
		
	}

Hi guys,

Just a basic question on why running balance doesn't show 8 after I update it? Is this not allowed in Java? Apologize for such a newbie question, but I couldn't find examples to achieve what I want.

Thanks

[BobS0327]

Java in general is pass by value instead of pass by reference. I believe this article will provide an excellent description of the issue.

But anyway, one possible alternative would be:

public class Test1 {

public static void main(String[] args) 
	{
	double[] runningBalance = new double[1];
		runningBalance[0] = 3.0;
		
		blah(runningBalance);
		
		System.out.println(runningBalance[0]);

	}

	private static void blah(double[] runningBalance) 
	{
		runningBalance[0] = runningBalance[0] += 8.0;
		
	}
}