BAEL-971 - An Introduction to Apache Commons Lang (#5165)

* Initial Commit

* Update SystemsUtilsUnitTest.java

* Update SystemsUtilsUnitTest.java

* Update ConstructorUtilsUnitTest.java

* Update FieldUtilsUnitTest.java

* Update ConstructorUtilsUnitTest.java

* Update MethodUtilsUnitTest.java

* Update BasicThreadFactoryUnitTest.java

* Update ConstructorUtilsUnitTest.java

libraries/src/main/java/com/baeldung/commons/lang3/application/Application.java

@@ -0,0 +1,8 @@
+package com.baeldung.commons.lang3.application;
+
+public class Application {
+    
+    public static void main(String[] args) {
+        
+    }
+}

libraries/src/main/java/com/baeldung/commons/lang3/beans/User.java

@@ -0,0 +1,25 @@
+package com.baeldung.commons.lang3.beans;
+
+public class User {
+
+    private final String name;
+    private final String email;
+
+    public User(String name, String email) {
+        this.name = name;
+        this.email = email;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "name=" + name + ", email=" + email + '}';
+    }
+}

libraries/src/main/java/com/baeldung/commons/lang3/beans/UserInitializer.java

@@ -0,0 +1,11 @@
+package com.baeldung.commons.lang3.beans;
+
+import org.apache.commons.lang3.concurrent.LazyInitializer;
+
+public class UserInitializer extends LazyInitializer<User> {
+
+    @Override
+    protected User initialize() {
+        return new User("John", "john@domain.com");
+    }
+}