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