From a9241773bb7b45ffe1f2efb2030f3c54291af734 Mon Sep 17 00:00:00 2001
From: Ahmed <148449109+202201638@users.noreply.github.com>
Date: Mon, 13 Jan 2025 23:43:27 +0200
Subject: [PATCH] Add files via upload

---
 visitor/src/main/java/Singleton.java          |  24 ++++++++++++++++++
 .../com/iluwatar/visitor/SingletonTest.java   |  23 +++++++++++++++++
 visitor/target/classes/Singleton.class        | Bin 0 -> 654 bytes
 .../classes/com/iluwatar/visitor/App.class    | Bin 0 -> 1014 bytes
 .../com/iluwatar/visitor/Commander.class      | Bin 0 -> 783 bytes
 .../iluwatar/visitor/CommanderVisitor.class   | Bin 0 -> 1190 bytes
 .../com/iluwatar/visitor/Sergeant.class       | Bin 0 -> 778 bytes
 .../iluwatar/visitor/SergeantVisitor.class    | Bin 0 -> 1177 bytes
 .../com/iluwatar/visitor/Soldier.class        | Bin 0 -> 773 bytes
 .../com/iluwatar/visitor/SoldierVisitor.class | Bin 0 -> 1178 bytes
 .../classes/com/iluwatar/visitor/Unit.class   | Bin 0 -> 1516 bytes
 .../com/iluwatar/visitor/UnitVisitor.class    | Bin 0 -> 267 bytes
 12 files changed, 47 insertions(+)
 create mode 100644 visitor/src/main/java/Singleton.java
 create mode 100644 visitor/src/test/java/com/iluwatar/visitor/SingletonTest.java
 create mode 100644 visitor/target/classes/Singleton.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/App.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/Commander.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/CommanderVisitor.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/Sergeant.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/SergeantVisitor.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/Soldier.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/SoldierVisitor.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/Unit.class
 create mode 100644 visitor/target/classes/com/iluwatar/visitor/UnitVisitor.class

diff --git a/visitor/src/main/java/Singleton.java b/visitor/src/main/java/Singleton.java
new file mode 100644
index 000000000000..80efe731f4a2
--- /dev/null
+++ b/visitor/src/main/java/Singleton.java
@@ -0,0 +1,24 @@
+public class Singleton {
+
+  // Variable estática que contiene la instancia única de la clase
+  private static Singleton instance;
+
+  // Constructor privado para evitar la creación de múltiples instancias
+  private Singleton() {
+    // Constructor privado para prevenir la instanciación
+  }
+
+  // Método público que retorna la única instancia de la clase
+  public static Singleton getInstance() {
+    // Verifica si la instancia es nula y la crea si es necesario
+    if (instance == null) {
+      instance = new Singleton();
+    }
+    return instance;
+  }
+
+  // Método de ejemplo que representa la funcionalidad de la clase Singleton
+  public void showMessage() {
+    System.out.println("¡Hola desde Singleton!");
+  }
+}
diff --git a/visitor/src/test/java/com/iluwatar/visitor/SingletonTest.java b/visitor/src/test/java/com/iluwatar/visitor/SingletonTest.java
new file mode 100644
index 000000000000..70c9391424ca
--- /dev/null
+++ b/visitor/src/test/java/com/iluwatar/visitor/SingletonTest.java
@@ -0,0 +1,23 @@
+package com.iluwatar.visitor;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+public class SingletonTest {
+
+  @Test
+  public void testSingletonInstance() {
+    // Obtiene dos instancias de Singleton
+    Singleton instance1 = Singleton.getInstance();
+    Singleton instance2 = Singleton.getInstance();
+
+    // Verifica que ambas instancias sean iguales (Singleton garantiza una única instancia)
+    assertSame(instance1, instance2, "Las dos instancias deberían ser iguales");
+
+    // Verifica el comportamiento del método en Singleton
+    instance1.showMessage();
+  }
+
+  private void assertSame(Singleton instance1, Singleton instance2, String s) {
+  }
+}
diff --git a/visitor/target/classes/Singleton.class b/visitor/target/classes/Singleton.class
new file mode 100644
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diff --git a/visitor/target/classes/com/iluwatar/visitor/App.class b/visitor/target/classes/com/iluwatar/visitor/App.class
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diff --git a/visitor/target/classes/com/iluwatar/visitor/Commander.class b/visitor/target/classes/com/iluwatar/visitor/Commander.class
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diff --git a/visitor/target/classes/com/iluwatar/visitor/Sergeant.class b/visitor/target/classes/com/iluwatar/visitor/Sergeant.class
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diff --git a/visitor/target/classes/com/iluwatar/visitor/UnitVisitor.class b/visitor/target/classes/com/iluwatar/visitor/UnitVisitor.class
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