Résultat du programme incorrecte

Bonsoir tout le monde,
Je suis nouveau au programmation Java et a ce site.
Jai ecrit un programme mais ca ne me donne pa le resultat ke je souhaite. Est ce que quelqu'un parmis vous peut me dire ou est mon erreur.
Merci.

Code:

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public class Counter
{
	int counter=0;
	int stepValue;
 
	public Counter(int step)
	{
			step=stepValue;
	}
 
	public void	increase(){
		counter =  counter+stepValue;
	}
	public void decrease(){
		counter = counter-stepValue;
	}
 
	public int getCount(){
		return counter;
	}
 
 
	public static void main(String[] args)
	{
 
		Counter counter = new Counter(1);  //create a new counter with a step value of 1
 
		counter.increase(); //add 1
		System.out.println("Expected Count: 1 -----> Actual Count: " + counter.getCount());
 
		counter.increase(); //add 1
		System.out.println("Expected Count: 2 -----> Actual Count: " + counter.getCount());
 
		counter.decrease(); //subtract 1
		System.out.println("Expected Count: 1 -----> Actual Count: " + counter.getCount());
 
 
		counter = new Counter(10); //create a new counter with a step value of 10
		System.out.println("Expected Count: 0 -----> Actual Count: " + counter.getCount());
 
		counter.increase(); //add 10
		System.out.println("Expected Count: 10 ----> Actual Count: " + counter.getCount());
 
		counter.decrease(); //subtract 10
		System.out.println("Expected Count: 0 -----> Actual Count: " + counter.getCount());
 
		counter.decrease(); //subtract 10
		System.out.println("Expected Count: -10 -----> Actual Count: " + counter.getCount());
 
	}
 
}