Java Counter Problems

For the public void setValue(int newcount) how do I make it so the value the other program sends is used to set the newcount? Also I have to do this "If the newcount < zero or > maxValue, do nothing."

    private int maxValue;
    private int count;

    /**
    * Constructor for objects of class Counter
    */
    public Counter(int maxValue) 
    {
        maxValue = 0;
    }

    public void decrement()
    {
       if (count == maxValue)
       {
           count = maxValue;        
       }
       else
       {
           --count;
       }
    }

   public int getValue() 
    {
        return maxValue;
    }

   public void increment()
    {
       if (count  == maxValue)
       {
           count = 0;        
       }
       else
       {
           ++count;
       }
    }

    public void setValue(int newcount) 
    {


    }


   public String toString()
    {
        return开发者_开发知识库 "Counter{" + "maxValue=" + maxValue + '}';
    } 
}

I'm a little confused as to what this does:

 public void decrement()
{
   if (count == maxValue)
   {
       count = maxValue;        
   }

It doesn't seem to actually be decrementing the value. In fact since count == maxValue, there is no point in setting it.

This should work:

public void setValue(int newcount) {
  if ((newcount < 0) || (newcount > maxValue))
    return;
  counter = newcount;
}

Your constructor does not do what you meant it to do:

private int maxValue;

/**
* Constructor for objects of class Counter
*/
public Counter(int maxValue) 
{
    maxValue = 0;
}

Your code just sets its argument to zero, the argument name hides the attribute (and why set it to 0?)

What would work, adding the @param javadoc line, is:

private int maxValue;

/**
 * Constructor for objects of class Counter.
 * @param newMaxValue The maximum counter value.
*/
public Counter(int newMaxValue) 
{
    maxValue = newMaxValue;
}

public void setValue(int newcount) 
{
   if(newcount >= 0 && newcount <= maxcount)
   {
      count = newcount;
   }
}