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Commit68166ed

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observer pattern
1 parentfc6e5e5 commit68166ed

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packagelearnHeadFirstDesignPatterns.chapter_2_observer_pattern;
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publicinterfaceCoreFamily {
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publicvoidregisterRelative(Relativerelative);
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publicvoidremoveRelative(Relativerelative);
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publicvoidnotifyRelative();
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publicvoidsetCoreFamilyAttributes(StringcoreFamilyNames,inthikingTimes,intmarriedMonths,StringbibleReadingProgress);
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}
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packagelearnHeadFirstDesignPatterns.chapter_2_observer_pattern;
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importjava.util.ArrayList;
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importjava.util.List;
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publicclassCoreFamilyImplimplementsCoreFamily {
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privateStringcoreFamilyName;
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privateStringbibleReadingProgress;
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privateintmonthsWeMarried;
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privateinttimesWeHiked;
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privateList<Relative>relatives;
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publicCoreFamilyImpl(StringbibleReadingProgress,StringcoreFamilyName,intmonthsWeMarried,inttimesWeHiked) {
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this.relatives =newArrayList<Relative>();
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this.bibleReadingProgress =bibleReadingProgress;
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this.coreFamilyName =coreFamilyName;
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this.monthsWeMarried =monthsWeMarried;
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this.timesWeHiked =timesWeHiked;
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}
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@Override
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publicvoidregisterRelative(Relativerelative) {
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relatives.add(relative);
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}
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@Override
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publicvoidremoveRelative(Relativerelative) {
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inti =relatives.indexOf(relative);
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if(i >0){
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relatives.remove(i);
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}
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}
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@Override
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publicvoidnotifyRelative() {
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for(inti =0;i <relatives.size();i++){
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Relativerelative = (Relative)relatives.get(i);
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relative.update(coreFamilyName,timesWeHiked,monthsWeMarried,bibleReadingProgress);
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}
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}
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publicvoidhasUpdates(){
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notifyRelative();
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}
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@Override
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publicvoidsetCoreFamilyAttributes(StringcoreFamilyNames,
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inthikingTimes,intmarriedMonths,StringbibleReadingProgress) {
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this.coreFamilyName =coreFamilyNames;
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this.timesWeHiked =hikingTimes;
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this.monthsWeMarried =marriedMonths;
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this.bibleReadingProgress =bibleReadingProgress;
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hasUpdates();
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_2_observer_pattern;
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/**NOTE: I didn't really implement the Observer pattern from Head First book here.
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* Just implemented the introduction part here. Could continue if interests arise in the future. - 10/04/2015*/
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/**
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* The Observer Pattern defines a one-to-many dependency between objects so that when one object changes state, all of its dependents are notified and updated automatically.
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*
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* Subjects + Observers = Observer Pattern */
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/**Design principle:
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* Strive for loosely coupled designs between objects that interact.*/
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publicclassObserverPatternTestDrive {
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publicstaticvoidmain(String[]args) {
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CoreFamilycoreFamily =newCoreFamilyImpl(" 1 Peter ","Steve Sun & Sophie Yan",1,7);
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Relativeeason =newRelativeImpl("Eason",coreFamily);
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coreFamily.registerRelative(eason);
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RelativemotherInLaw =newRelativeImpl("Jinzhi Lin",coreFamily);
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coreFamily.registerRelative(motherInLaw);
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RelativefatherInLaw =newRelativeImpl("Jianlin Yan",coreFamily);
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coreFamily.registerRelative(fatherInLaw);
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coreFamily.setCoreFamilyAttributes("Sophie and Steve NEW NAME",8,2,"1 John");
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System.out.print("Program ended.");
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_2_observer_pattern;
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publicinterfaceRelative {
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publicvoidupdate(StringcoreFamilyNames,inthikingTimes,intmarriedMonths,StringbibleReadingProgress);
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}
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packagelearnHeadFirstDesignPatterns.chapter_2_observer_pattern;
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publicclassRelativeImplimplementsRelative {
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privateStringrelativeName;
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privateCoreFamilycoreFamily;
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privateStringcoreFamilyName;
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privateStringbibleReadingProgress;
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privateintmonthsWeMarried;
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privateinttimesWeHiked;
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publicRelativeImpl(StringrelativeName,CoreFamilycoreFamily) {
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this.relativeName =relativeName;
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this.coreFamily =coreFamily;
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}
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@Override
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publicvoidupdate(StringcoreFamilyNames,inthikingTimes,intmarriedMonths,StringbibleReadingProgress) {
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System.out.print("Before updating:\n");
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display();
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this.bibleReadingProgress =bibleReadingProgress;
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this.coreFamilyName =coreFamilyNames;
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this.monthsWeMarried =marriedMonths;
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this.timesWeHiked =hikingTimes;
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System.out.print("After updating:\n");
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display();
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}
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privatevoiddisplay() {
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System.out.println("Current CoreFamilyAttributes are, coreFamilyName is: " +coreFamilyName +"\tbibleReadingProgress is: "
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+bibleReadingProgress +"\tmonthsWeMarried is: " +monthsWeMarried +"\ttimesWeHiked is: " +timesWeHiked);
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}
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}

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