self.setAccessor(accessor);
self.setAccessor(newExp);
    public Object visitArrayAccessExpression(JArrayAccessExpression self,					     JExpression prefix,					     JExpression accessor) {	prefix.accept(this);	JExpression newExp = (JExpression)accessor.accept(this);	if (newExp.isConstant()) {	    self.setAccessor(accessor);	}	return self;    }