Composition VS Inheritance

Equals VS Referance String Pooling

Author: serdaralkancode

pom.xml

@@ -8,5 +8,23 @@
  <artifactId>java-features-examples</artifactId>
  <version>1.0-SNAPSHOT</version>
 
+ <build>
+
+ <plugins>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-compiler-plugin</artifactId>
+ <version>3.8.0</version>
+ <configuration>
+ <release>11</release>
+ <source>8</source>
+ <target>8</target> <!--or <release>10</release>-->
+ </configuration>
+ </plugin>
+ </plugins>
+
+ </build>
+
+
 
 </project>

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/CompositionVsInheritanceMain.java

@@ -0,0 +1,17 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.composition;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class CityExample {
+
+ static Set<String> set = new HashSet<>();
+
+ public static void main(String[] args) {
+
+ set.add("İstanbul");
+ set.add("Ankara");
+ set.add("Konya");
+ set.forEach(System.out::println);
+ }
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/composition/CityExample.java

@@ -0,0 +1,90 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.composition;
+
+public class HumanExample {
+
+
+ public static void main(String[] args) {
+
+ Hand hand = new Hand(true);
+ Foot foot = new Foot(43);
+ Face face = new Face(true);
+
+ Human human = new Human(hand,foot,face);
+
+ System.out.println(human);
+ }
+
+ static class Human {
+
+ Hand hand;
+ Foot foot;
+ Face face;
+
+ public Human(Hand hand, Foot foot, Face face) {
+ this.hand = hand;
+ this.foot = foot;
+ this.face = face;
+ }
+
+ @Override
+ public String toString() {
+ return "Human{" +
+ "hand clearing =" + hand.isClear +
+ ", foot number =" + foot.footNumber +
+ ", face has beard =" + face.hasBeard +
+ '}';
+ }
+ }
+
+
+ static class Hand {
+
+ boolean isClear = false;
+
+ public Hand(boolean isClear) {
+ this.isClear = isClear;
+ }
+
+ public boolean isClear() {
+ return isClear;
+ }
+
+ public void setClear(boolean clear) {
+ isClear = clear;
+ }
+ }
+
+ static class Foot {
+
+ int footNumber = 0;
+
+ public Foot(int footNumber) {
+ this.footNumber = footNumber;
+ }
+
+ public int getFootNumber() {
+ return footNumber;
+ }
+
+ public void setFootNumber(int footNumber) {
+ this.footNumber = footNumber;
+ }
+ }
+
+ static class Face {
+
+ boolean hasBeard = false;
+
+ public Face(boolean hasBeard) {
+ this.hasBeard = hasBeard;
+ }
+
+ public boolean isHasBeard() {
+ return hasBeard;
+ }
+
+ public void setHasBeard(boolean hasBeard) {
+ this.hasBeard = hasBeard;
+ }
+ }
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/composition/HumanExample.java

@@ -0,0 +1,18 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.inheritance;
+
+import java.util.HashSet;
+
+public class CityExample extends HashSet<Object> {
+
+
+ public static void main(String[] args) {
+
+ CityExample cities = new CityExample();
+ cities.add("İstanbul");
+ cities.add("Ankara");
+ cities.add("Konya");
+
+ cities.forEach(System.out::println);
+ }
+
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/inheritance/CityExample.java

@@ -0,0 +1,40 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.inheritance;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Human {
+
+ public void borningInWhere(String location){
+
+ System.out.println("Human borning somewhere");
+ }
+
+ public void eatingSomething(String food)
+ {
+ System.out.println("Human eating something");
+ }
+
+ List<String> getBodyActivities()
+ {
+ List<String> bodyActivities = new ArrayList<>();
+
+ bodyActivities.add("Running");
+ bodyActivities.add("Walking");
+ bodyActivities.add("Jumping");
+
+ return bodyActivities;
+ }
+
+ List<String> getMentalActivities() {
+
+ List<String> mentalActivities = new ArrayList<>();
+
+ mentalActivities.add("Thinking");
+ mentalActivities.add("Estimating");
+ mentalActivities.add("Imaging");
+
+ return mentalActivities;
+ }
+
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/inheritance/Human.java

@@ -0,0 +1,25 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.inheritance;
+
+public class HumanExample {
+
+ public static void main(String[] args) {
+
+ Human turkishMan = new TurkishMan();
+
+ turkishMan.borningInWhere("Turkey"); //overide
+ turkishMan.eatingSomething("Kebap"); //override
+ turkishMan.getBodyActivities().forEach(System.out::println); //super method
+
+ ((TurkishMan)turkishMan).turkishManNameExample("Ahmet"); // method in TurkishMan class
+
+ Human italianMan = new ItalianMan();
+
+ turkishMan.borningInWhere("Italy"); //overide
+ turkishMan.eatingSomething("Spaghetti"); //overide
+ italianMan.getMentalActivities().forEach(System.out::println); //super method
+
+ ((ItalianMan)italianMan).italianManNameExample("Del Pierro"); // method in ItalianMan class
+
+
+ }
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/inheritance/HumanExample.java

@@ -0,0 +1,20 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.inheritance;
+
+public class ItalianMan extends Human {
+
+ @Override
+ public void borningInWhere(String location) {
+ System.out.println("In general a Italian man born in " + location);
+ }
+
+ @Override
+ public void eatingSomething(String food) {
+
+ System.out.println("In general a Turkish man eating " + food);
+ }
+
+ public void italianManNameExample(String name)
+ {
+ System.out.println(name);
+ }
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/inheritance/ItalianMan.java

@@ -0,0 +1,20 @@
+package tr.salkan.code.java.pure.examples.compositionVsinheritance.inheritance;
+
+public class TurkishMan extends Human {
+
+
+ @Override
+ public void borningInWhere(String location) {
+ System.out.println("In general a Turkish man born in " + location);
+ }
+
+ @Override
+ public void eatingSomething(String food) {
+ System.out.println("In general a Turkish man eating " + food);
+ }
+
+ public void turkishManNameExample(String name)
+ {
+ System.out.println(name);
+ }
+}

src/main/java/tr/salkan/code/java/pure/examples/compositionVsinheritance/inheritance/TurkishMan.java

@@ -0,0 +1,18 @@
+package tr.salkan.code.java.pure.examples.equalsVSreferance;
+
+public class Man extends Person {
+
+ public Man(String name, int age) {
+ super(name, age);
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ return super.equals(o);
+ }
+
+ @Override
+ public int hashCode() {
+ return super.hashCode();
+ }
+}