JAVA-1522 Split core-java-modules/core-java module

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

@@ -9,3 +9,4 @@
 - [Differences Between Collection.clear() and Collection.removeAll()](https://www.baeldung.com/java-collection-clear-vs-removeall)
 - [Performance of contains() in a HashSet vs ArrayList](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
 - [Fail-Safe Iterator vs Fail-Fast Iterator](https://www.baeldung.com/java-fail-safe-vs-fail-fast-iterator)
+- [Quick Guide to the Java Stack](https://www.baeldung.com/java-stack)

core-java-modules/core-java-console/src/test/java/com/baeldung/asciiart/AsciiArtIntegrationTest.java

@@ -14,8 +14,5 @@ public class AsciiArtIntegrationTest {
         Settings settings = asciiArt.new Settings(new Font("SansSerif", Font.BOLD, 24), text.length() * 30, 30); // 30 pixel width per character
         
         asciiArt.drawString(text, "*", settings);
-
-        throw new NullPointerException();
     }
-    
 }

core-java-modules/core-java-date-operations-2/README.md

@@ -8,4 +8,5 @@ This module contains articles about date operations in Java.
 - [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime)
 - [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
 - [How to determine day of week by passing specific date in Java?](https://www.baeldung.com/java-get-day-of-week)
+- [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
 - [[<-- Prev]](/core-java-modules/core-java-date-operations-1)

core-java-modules/core-java-jvm/README.md

@@ -12,3 +12,4 @@ This module contains articles about working with the Java Virtual Machine (JVM).
 - [Guide to System.gc()](https://www.baeldung.com/java-system-gc)
 - [Runtime.getRuntime().halt() vs System.exit() in Java](https://www.baeldung.com/java-runtime-halt-vs-system-exit)
 - [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)
+- [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)

core-java-modules/core-java-reflection/README.MD

@@ -8,3 +8,5 @@
 - [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
 - [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)
 - [What Causes java.lang.reflect.InvocationTargetException?](https://www.baeldung.com/java-lang-reflect-invocationtargetexception)
+- [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
+- [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)

core-java-modules/core-java-string-operations-2/README.md

@@ -12,4 +12,6 @@ This module contains articles about string operations.
 - [L-Trim and R-Trim Alternatives in Java](https://www.baeldung.com/java-trim-alternatives)
 - [Java Convert PDF to Base64](https://www.baeldung.com/java-convert-pdf-to-base64)
 - [Encode a String to UTF-8 in Java](https://www.baeldung.com/java-string-encode-utf-8)
+- [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)
+- [Convert Hex to ASCII in Java](https://www.baeldung.com/java-convert-hex-to-ascii) #remove additional readme file
 - More articles: [[<-- prev]](../core-java-string-operations)

core-java-modules/core-java-time-measurements/README.md

@@ -6,3 +6,4 @@ This module contains articles about the measurement of time in Java.
 - [Guide to the Java Clock Class](http://www.baeldung.com/java-clock)
 - [Measure Elapsed Time in Java](http://www.baeldung.com/java-measure-elapsed-time)
 - [Overriding System Time for Testing in Java](https://www.baeldung.com/java-override-system-time)
+- [Java Timer](http://www.baeldung.com/java-timer-and-timertask)

core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/clock/ClockUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.clock;
+package com.baeldung.clock;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;

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

@@ -1,44 +1,6 @@
 ## Core Java Cookbooks and Examples
 
 ### Relevant Articles: 
-- [Java Timer](http://www.baeldung.com/java-timer-and-timertask)
-- [Getting Started with Java Properties](http://www.baeldung.com/java-properties)
-- [Introduction to Nashorn](http://www.baeldung.com/java-nashorn)
-- [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
-- [JVM Log Forging](http://www.baeldung.com/jvm-log-forging)
-- [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
-- [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)
-- [Introduction to Java Serialization](http://www.baeldung.com/java-serialization)
-- [Guide to UUID in Java](http://www.baeldung.com/java-uuid)
-- [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
-- [Quick Guide to the Java Stack](https://www.baeldung.com/java-stack)
-- [Compiling Java *.class Files with javac](http://www.baeldung.com/javac)
-- [Introduction to Javadoc](http://www.baeldung.com/javadoc)
-- [Guide to the Externalizable Interface in Java](http://www.baeldung.com/java-externalizable)
-- [ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)
-- [What is the serialVersionUID?](http://www.baeldung.com/java-serial-version-uid)
-- [A Guide to the ResourceBundle](http://www.baeldung.com/java-resourcebundle)
-- [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
-- [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
-- [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
-- [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
-- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
-- [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)
-- [Graphs in Java](https://www.baeldung.com/java-graphs)
-- [Read and Write User Input in Java](http://www.baeldung.com/java-console-input-output)
-- [Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
-- [Retrieve Fields from a Java Class Using Reflection](https://www.baeldung.com/java-reflection-class-fields)
-- [Using Curl in Java](https://www.baeldung.com/java-curl)
-- [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
-- [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)
-- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
-- [Convert Hex to ASCII in Java](https://www.baeldung.com/java-convert-hex-to-ascii)
-
-
-#New module structure
-###########################
-
-#Leave in core-java:
 [Getting Started with Java Properties](http://www.baeldung.com/java-properties)
 [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
 [Introduction to Java Serialization](http://www.baeldung.com/java-serialization)
@@ -49,47 +11,3 @@
 [What is the serialVersionUID?](http://www.baeldung.com/java-serial-version-uid)
 [A Guide to the ResourceBundle](http://www.baeldung.com/java-resourcebundle)
 [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
-
-#Move to language interop (Done)
-[Introduction to Nashorn](http://www.baeldung.com/java-nashorn)
-
-#Move to new new package: core-java-console (Done)
-[Read and Write User Input in Java](http://www.baeldung.com/java-console-input-output)
-[Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
-[ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)
-
-#Move to core-java-string-operations-2
-[Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)
-[Convert Hex to ASCII in Java](https://www.baeldung.com/java-convert-hex-to-ascii) #remove additional readme file
-
-#Move to core-javadatetime-operations-2
-[Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
-
-#Move to core-java-time-measurements
-[Java Timer](http://www.baeldung.com/java-timer-and-timertask)
-
-#Move to core-java-reflection
-[How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)
-
-#Move to core-java-streams
-[How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
-
-#Move to core-java-jvm
-[How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
-
-#Move to data-structures module
-[Graphs in Java](https://www.baeldung.com/java-graphs)
-
-#Move to core-java-collections-3
-[Quick Guide to the Java Stack](https://www.baeldung.com/java-stack)
-
-#These are already in another module
-[Using Curl in Java](https://www.baeldung.com/java-curl) #Core Java Networking (Part 2)
-[Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin) # Core Java Sun
-[Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler) #Core Java Exceptions
-[Java – Try with Resources](https://www.baeldung.com/java-try-with-resources) #Core Java Exceptions
-[How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause) #Core Java Exceptions
-[JVM Log Forging](http://www.baeldung.com/jvm-log-forging) #Core Java JVM
-[Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post) #Core Java Networking (Part 2)
-[Common Java Exceptions](http://www.baeldung.com/java-common-exceptions) #Core Java Exceptions
-[Retrieve Fields from a Java Class Using Reflection](https://www.baeldung.com/java-reflection-class-fields) #Core Java Reflection

core-java-modules/core-java/src/main/java/com/baeldung/graph/Graph.java

@@ -1,101 +0,0 @@
-package com.baeldung.graph;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.stream.Collectors;
-
-public class Graph {
-    private Map<Vertex, List<Vertex>> adjVertices;
-
-    Graph() {
-        this.adjVertices = new HashMap<Vertex, List<Vertex>>();
-    }
-
-    void addVertex(String label) {
-        adjVertices.putIfAbsent(new Vertex(label), new ArrayList<>());
-    }
-
-    void removeVertex(String label) {
-        Vertex v = new Vertex(label);
-        adjVertices.values().stream().forEach(e -> e.remove(v));
-        adjVertices.remove(new Vertex(label));
-    }
-
-    void addEdge(String label1, String label2) {
-        Vertex v1 = new Vertex(label1);
-        Vertex v2 = new Vertex(label2);
-        adjVertices.get(v1).add(v2);
-        adjVertices.get(v2).add(v1);
-    }
-
-    void removeEdge(String label1, String label2) {
-        Vertex v1 = new Vertex(label1);
-        Vertex v2 = new Vertex(label2);
-        List<Vertex> eV1 = adjVertices.get(v1);
-        List<Vertex> eV2 = adjVertices.get(v2);
-        if (eV1 != null)
-            eV1.remove(v2);
-        if (eV2 != null)
-            eV2.remove(v1);
-    }
-
-    List<Vertex> getAdjVertices(String label) {
-        return adjVertices.get(new Vertex(label));
-    }
-    
-    String printGraph() {
-        StringBuffer sb = new StringBuffer();
-        for(Vertex v : adjVertices.keySet()) {
-            sb.append(v);
-            sb.append(adjVertices.get(v));
-        }
-        return sb.toString();
-    }
-
-    class Vertex {
-        String label;
-        Vertex(String label) {
-            this.label = label;
-        }
-        
-        @Override
-        public int hashCode() {
-            final int prime = 31;
-            int result = 1;
-            result = prime * result + getOuterType().hashCode();
-            result = prime * result + ((label == null) ? 0 : label.hashCode());
-            return result;
-        }
-        
-        @Override
-        public boolean equals(Object obj) {
-            if (this == obj)
-                return true;
-            if (obj == null)
-                return false;
-            if (getClass() != obj.getClass())
-                return false;
-            Vertex other = (Vertex) obj;
-            if (!getOuterType().equals(other.getOuterType()))
-                return false;
-            if (label == null) {
-                if (other.label != null)
-                    return false;
-            } else if (!label.equals(other.label))
-                return false;
-            return true;
-        }
-
-        @Override
-        public String toString() {
-            return label;
-        }
-
-
-        private Graph getOuterType() {
-            return Graph.this;
-        }
-    }
-}

core-java-modules/core-java/src/main/java/com/baeldung/graph/GraphTraversal.java

@@ -1,44 +0,0 @@
-package com.baeldung.graph;
-
-import java.util.LinkedHashSet;
-import java.util.LinkedList;
-import java.util.Queue;
-import java.util.Set;
-import java.util.Stack;
-
-import com.baeldung.graph.Graph.Vertex;
-
-public class GraphTraversal {
-    static Set<String> depthFirstTraversal(Graph graph, String root) {
-        Set<String> visited = new LinkedHashSet<String>();
-        Stack<String> stack = new Stack<String>();
-        stack.push(root);
-        while (!stack.isEmpty()) {
-            String vertex = stack.pop();
-            if (!visited.contains(vertex)) {
-                visited.add(vertex);
-                for (Vertex v : graph.getAdjVertices(vertex)) {              
-                    stack.push(v.label);
-                }
-            }
-        }
-        return visited;
-    }
-
-    static Set<String> breadthFirstTraversal(Graph graph, String root) {
-        Set<String> visited = new LinkedHashSet<String>();
-        Queue<String> queue = new LinkedList<String>();
-        queue.add(root);
-        visited.add(root);
-        while (!queue.isEmpty()) {
-            String vertex = queue.poll();
-            for (Vertex v : graph.getAdjVertices(vertex)) {
-                if (!visited.contains(v.label)) {
-                    visited.add(v.label);
-                    queue.add(v.label);
-                }
-            }
-        }
-        return visited;
-    }
-}

core-java-modules/core-java/src/test/java/com/baeldung/graph/GraphUnitTest.java

@@ -1,47 +0,0 @@
-package com.baeldung.graph;
-
-import static org.junit.Assert.assertEquals;
-import org.junit.Test;
-
-public class GraphUnitTest {
-    @Test
-    public void givenAGraph_whenTraversingDepthFirst_thenExpectedResult() {
-        Graph graph = createGraph();
-        assertEquals("[Bob, Rob, Maria, Alice, Mark]", 
-            GraphTraversal.depthFirstTraversal(graph, "Bob").toString());
-    }
-    
-    @Test
-    public void givenAGraph_whenTraversingBreadthFirst_thenExpectedResult() {
-        Graph graph = createGraph();
-       assertEquals("[Bob, Alice, Rob, Mark, Maria]", 
-            GraphTraversal.breadthFirstTraversal(graph, "Bob").toString());
-    }
-    
-    @Test
-    public void givenAGraph_whenRemoveVertex_thenVertedNotFound() {
-        Graph graph = createGraph();
-        assertEquals("[Bob, Alice, Rob, Mark, Maria]", 
-            GraphTraversal.breadthFirstTraversal(graph, "Bob").toString());
-        
-        graph.removeVertex("Maria");
-        assertEquals("[Bob, Alice, Rob, Mark]", 
-            GraphTraversal.breadthFirstTraversal(graph, "Bob").toString());
-    }
-    
-    Graph createGraph() {
-        Graph graph = new Graph();
-        graph.addVertex("Bob");
-        graph.addVertex("Alice");
-        graph.addVertex("Mark");
-        graph.addVertex("Rob");
-        graph.addVertex("Maria");
-        graph.addEdge("Bob", "Alice");
-        graph.addEdge("Bob", "Rob");
-        graph.addEdge("Alice", "Mark");
-        graph.addEdge("Rob", "Mark");
-        graph.addEdge("Alice", "Maria");
-        graph.addEdge("Rob", "Maria");
-        return graph;
-    }
-}