public float max(float[] array) {
float retVal = -Float.MAX_VALUE;

for(int i = 0; i < array.length; i++) {
if(array[i] > retVal) {
retVal = array[i];
}
}

return retVal;
}

in 0124 can run,but in 0125
Semantic Error: The instance method "float max(float[] array);" cannot override the accessible static method "float max(float[] $1);" declared in type "processing.core.PApplet".

Check out http://processing.org/download/revisions.txt - max() has been added for float and int arrays, so you should not need to implement these yourself anymore.  You're getting an error because you can't override a static method (though see http://faq.javaranch.com/view?OverridingVsHiding for more discussion on this - long story short, if you declare your new method static you can hide the old one, but it's not quite the same as overriding it).  The implementation in 0125 is as follows:

Code:

  static public final float max(float[] list) {
    if (list.length == 0) {
	return Float.NaN;
    }
    float max = list[0];
    for (int i = 1; i < list.length; i++) {
	if (list[i] > max) max = list[i];
    }
    return max;
  }
 

This should be doing what you want, as long as you realize that it sends NaN if the array is empty rather than MAX_VALUE, so you should be all set.