setBlockIncrement(pageIncrement);
if (pageIncrement < 0) throw new IllegalArgumentException ("Block increment less than zero.");  int range = maximum - minimum; if (pageIncrement > range) { if (range == 0) pageIncrement = 1; else pageIncrement = range; }  if (pageIncrement == this.pageIncrement) return;  this.pageIncrement = pageIncrement;  ScrollbarPeer sp = (ScrollbarPeer) getPeer (); if (sp != null) sp.setPageIncrement (this.pageIncrement);
setPageIncrement(int pageIncrement){  setBlockIncrement(pageIncrement);}