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Message: [QUOTE="JScoobyCed, post: 614751"] What about: public interface GapListener { public void updateGap(); } public class GapManager implements GapListener { public void setGap(Gap gap) { // ... gap.setGapListener(this); doLayout(); } public void updateGap() { doLayout(); } } public class NewGap extends Gap { // or maybe if you own the Gap object simply: // public class Gap { private static GapListener gapListener = null; public static void setGapListener(GapListener gapListener) { this.gapListener = gapListener; } public static void setXXX(XXX xxx) { // do XXX stuff here if(gapListener != null) { gapListener.updateGap(); } } } [/QUOTE]