BAEL 4157 Move examples to new core-java-lang-3 module (#9678)

core-java-modules/core-java-lang-3/README.md

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+## Core Java Lang (Part 3)
+
+This module contains articles about core features in the Java language
+
+### Relevant Articles: 
+- [[<-- Prev]](/core-java-modules/core-java-lang-2)

core-java-modules/core-java-lang-3/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-lang-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-lang-3</name>
+    <packaging>jar</packaging>
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../</relativePath>
+    </parent>
+
+    <dependencies>
+        
+    </dependencies>
+
+    <build>
+        <finalName>core-java-lang-3</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        
+    </properties>
+
+</project>

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/isinstancevsisassignablefrom/IsoscelesTriangle.java

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+package com.baeldung.isinstancevsisassignablefrom;
+
+public class IsoscelesTriangle extends Triangle {
+
+}

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/isinstancevsisassignablefrom/Shape.java

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+package com.baeldung.isinstancevsisassignablefrom;
+
+public interface Shape {
+
+}

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/isinstancevsisassignablefrom/Triangle.java

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+package com.baeldung.isinstancevsisassignablefrom;
+
+public class Triangle implements Shape {
+
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/isinstancevsisassignablefrom/IsInstanceIsAssignableFromUnitTest.java

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+package com.baeldung.isinstancevsisassignablefrom;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class IsInstanceIsAssignableFromUnitTest {
+    
+    @Test
+    public void whenUsingIsInstanceProperly_desiredResultsHappen() {
+        Shape shape = new Triangle();
+        Triangle triangle = new Triangle();
+        IsoscelesTriangle isoscelesTriangle = new IsoscelesTriangle();
+        Triangle isoscelesTriangle2 = new IsoscelesTriangle();
+        Shape nonspecificShape = null;
+        
+        assertTrue(Shape.class.isInstance(shape));
+        assertTrue(Shape.class.isInstance(triangle));
+        assertTrue(Shape.class.isInstance(isoscelesTriangle));
+        assertTrue(Shape.class.isInstance(isoscelesTriangle2));
+        assertFalse(Shape.class.isInstance(nonspecificShape));
+        
+        assertTrue(Triangle.class.isInstance(shape));
+        assertTrue(Triangle.class.isInstance(triangle));
+        assertTrue(Triangle.class.isInstance(isoscelesTriangle));
+        assertTrue(Triangle.class.isInstance(isoscelesTriangle2));
+        
+        assertFalse(IsoscelesTriangle.class.isInstance(shape));
+        assertFalse(IsoscelesTriangle.class.isInstance(triangle));
+        assertTrue(IsoscelesTriangle.class.isInstance(isoscelesTriangle));
+        assertTrue(IsoscelesTriangle.class.isInstance(isoscelesTriangle2));        
+    }
+    
+    @Test
+    public void whenUsingIsAssignableFromProperly_desiredResultsHappen() {
+        Shape shape = new Triangle();
+        Triangle triangle = new Triangle();
+        IsoscelesTriangle isoscelesTriangle = new IsoscelesTriangle();
+        Triangle isoscelesTriangle2 = new IsoscelesTriangle();
+        
+        assertFalse(shape.getClass().isAssignableFrom(Shape.class));
+        assertTrue(shape.getClass().isAssignableFrom(shape.getClass()));
+        assertTrue(shape.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(shape.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(shape.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+        
+        assertFalse(triangle.getClass().isAssignableFrom(Shape.class));
+        assertTrue(triangle.getClass().isAssignableFrom(shape.getClass()));
+        assertTrue(triangle.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(triangle.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(triangle.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+        
+        assertFalse(isoscelesTriangle.getClass().isAssignableFrom(Shape.class));
+        assertFalse(isoscelesTriangle.getClass().isAssignableFrom(shape.getClass()));
+        assertFalse(isoscelesTriangle.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(isoscelesTriangle.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(isoscelesTriangle.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+        
+        assertFalse(isoscelesTriangle2.getClass().isAssignableFrom(Shape.class));
+        assertFalse(isoscelesTriangle2.getClass().isAssignableFrom(shape.getClass()));
+        assertFalse(isoscelesTriangle2.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(isoscelesTriangle2.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(isoscelesTriangle2.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+    }
+
+}