BAEL-5979 Instanceof Alternatives (#13082)

* simple-thymeleaf-expression

* expression-update

* instanceof

* instanceof

* instanceof

* update

* Update pom.xml

* Update pom.xml

* instanceof

* update

* instanceofnew

* instanceofnew

* instanceofnew

* instanceofnew

* instanceofnew

* instanceofnew

* update

* pom

* Revert "pom"

This reverts commit c5075e6ba7.

* Revert "Update pom.xml"

This reverts commit 7dd02df1ae.

* Revert "Revert "Update pom.xml""

This reverts commit a02a1f67d1.

* Update pom.xml

* Revert "Update pom.xml"

This reverts commit 7dd02df1ae.

* Update pom.xml

* JAVA-8436: Remove AssertJ depenendency from the child modules - part 4

* Update pom.xml

* JAVA-8436: Remove AssertJ depenendency from the child modules - part 4

* BAEL-5979 Instanceof Alternatives

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/enumallt/DinosaurEnum.java

@@ -0,0 +1,19 @@
+package com.baeldung.instanceofalternative.enumallt;
+
+public enum DinosaurEnum {
+    Anatotitan {
+        @Override
+        public String move() {
+            return "running";
+        }
+    },
+    Euraptor {
+        @Override
+        public String move() {
+            return "flying";
+        }
+    };
+
+    public abstract String move();
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/model/Anatotitan.java

@@ -0,0 +1,15 @@
+package com.baeldung.instanceofalternative.model;
+
+public class Anatotitan extends Dinosaur {
+    // polymorphism
+    @Override
+    public String move() {
+        return "running";
+    }
+
+    // non-polymorphism
+    public String run() {
+        return "running";
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/model/Dinosaur.java

@@ -0,0 +1,9 @@
+package com.baeldung.instanceofalternative.model;
+
+public class Dinosaur {
+
+    public String move() {
+        return "default movement";
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/model/Euraptor.java

@@ -0,0 +1,15 @@
+package com.baeldung.instanceofalternative.model;
+
+public class Euraptor extends Dinosaur {
+    // polymorphism
+    @Override
+    public String move() {
+        return "flying";
+    }
+
+    // non-polymorphism
+    public String flies() {
+        return "flying";
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Anatotitan.java

@@ -0,0 +1,14 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public class Anatotitan implements Dino {
+
+    String run() {
+        return "running";
+    }
+
+    @Override
+    public String move(Visitor dinobehave) {
+        return dinobehave.visit(this);
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Dino.java

@@ -0,0 +1,7 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public interface Dino {
+
+    String move(Visitor dinoMove);
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/DinoVisitorImpl.java

@@ -0,0 +1,15 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public class DinoVisitorImpl implements Visitor {
+
+    @Override
+    public String visit(Anatotitan anatotitan) {
+        return anatotitan.run();
+    }
+
+    @Override
+    public String visit(Euraptor euraptor) {
+        return euraptor.flies();
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Euraptor.java

@@ -0,0 +1,14 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public class Euraptor implements Dino {
+
+    String flies() {
+        return "flying";
+    }
+
+    @Override
+    public String move(Visitor dinobehave) {
+        return dinobehave.visit(this);
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Visitor.java

@@ -0,0 +1,9 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public interface Visitor {
+
+    String visit(Anatotitan anatotitan);
+
+    String visit(Euraptor euraptor);
+
+}