Add Example Code (#14521)

di-modules/avaje/README.md

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+# Introduction to Avaje Inject 
+
+This module contains articles about Avaje
+
+### Relevant articles:
+
+- [Introduction to Avaje Inject](https://www.baeldung.com/avaje-inject/intro)

di-modules/avaje/pom.xml

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+<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung</groupId>
+	<artifactId>inject-intro</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>avaje-inject-intro</name>
+	<properties>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
+		<avaje.inject.version>9.5</avaje.inject.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>io.avaje</groupId>
+			<artifactId>avaje-inject</artifactId>
+			<version>${avaje.inject.version}</version>
+		</dependency>
+
+		<dependency>
+			<groupId>io.avaje</groupId>
+			<artifactId>avaje-inject-test</artifactId>
+			<version>${avaje.inject.version}</version>
+			<scope>test</scope>
+		</dependency>
+
+		<!-- Annotation processors -->
+		<dependency>
+			<groupId>io.avaje</groupId>
+			<artifactId>avaje-inject-generator</artifactId>
+			<version>${avaje.inject.version}</version>
+			<scope>provided</scope>
+			<optional>true</optional>
+		</dependency>
+	</dependencies>
+</project>

di-modules/avaje/src/main/java/com/baeldung/avaje/intro/ArmsFactory.java

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+package com.baeldung.avaje.intro;
+
+import io.avaje.inject.Bean;
+import io.avaje.inject.Factory;
+
+@Factory
+public class ArmsFactory {
+
+  @Bean
+  public Sword provideSword() {
+    return new Sword();
+  }
+
+  @Bean
+  public Shield provideShield() {
+    return new Shield(25);
+  }
+}

di-modules/avaje/src/main/java/com/baeldung/avaje/intro/Knight.java

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+package com.baeldung.avaje.intro;
+
+import jakarta.inject.Inject;
+import jakarta.inject.Singleton;
+
+@Singleton
+public class Knight {
+
+  private Sword sword;
+
+  private Shield shield;
+
+  @Inject
+  public Knight(Sword sword, Shield shield) {
+    this.sword = sword;
+    this.shield = shield;
+  }
+
+  public Sword sword() {
+    return sword;
+  }
+
+  public void sword(Sword engine) {
+    this.sword = engine;
+  }
+
+  public Shield shield() {
+    return shield;
+  }
+
+  public void shield(Shield brand) {
+    this.shield = brand;
+  }
+}

di-modules/avaje/src/main/java/com/baeldung/avaje/intro/Ninja.java

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+package com.baeldung.avaje.intro;
+
+import io.avaje.inject.BeanScope;
+import io.avaje.inject.PostConstruct;
+import io.avaje.inject.PreDestroy;
+import jakarta.inject.Singleton;
+
+@Singleton
+public class Ninja {
+
+  private Sword sword;
+
+  @PostConstruct
+  void equip(BeanScope scope) {
+    sword = scope.get(Sword.class);
+  }
+
+  @PreDestroy
+  void dequip() {
+    sword = null;
+  }
+
+  public Sword sword() {
+    return sword;
+  }
+
+  public void sword(Sword engine) {
+    this.sword = engine;
+  }
+}

di-modules/avaje/src/main/java/com/baeldung/avaje/intro/Shield.java

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+package com.baeldung.avaje.intro;
+
+public class Shield {
+
+  private int defense;
+
+  public Shield(int defense) {
+    this.defense = defense;
+  }
+
+  public int defense() {
+    return defense;
+  }
+
+  public void defense(int defense) {
+    this.defense = defense;
+  }
+}

di-modules/avaje/src/main/java/com/baeldung/avaje/intro/Sword.java

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+package com.baeldung.avaje.intro;
+
+public class Sword {
+
+  public void attack() {
+    System.out.println("swing");
+  }
+}

di-modules/avaje/src/test/java/com/baeldung/avaje/intro/AvajeUnitTest.java

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+package com.baeldung.avaje.intro;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+import io.avaje.inject.BeanScope;
+
+class AvajeUnitTest {
+
+  @Test
+  void givenBeanScope_whenScopeGetsKnight_thenKnightShouldHaveDependencies() {
+
+    final var scope = BeanScope.builder().build();
+    final var knight = scope.get(Knight.class);
+
+    assertNotNull(knight);
+    assertNotNull(knight.sword());
+    assertNotNull(knight.shield());
+    assertEquals(25, knight.shield().defense());
+  }
+}

di-modules/avaje/src/test/java/com/baeldung/avaje/intro/ExampleInjectTest.java

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+package com.baeldung.avaje.intro;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+
+import io.avaje.inject.test.InjectTest;
+import jakarta.inject.Inject;
+
+@InjectTest
+class ExampleInjectTest {
+
+  @Mock Shield shield;
+
+  @Inject Knight knight;
+
+  @Test
+  void givenMockedShield_whenGetShield_thenShieldShouldHaveMockedValue() {
+
+    Mockito.when(shield.defense()).thenReturn(0);
+    assertNotNull(knight);
+    assertNotNull(knight.sword());
+    assertNotNull(knight.shield());
+    assertEquals(0, knight.shield().defense());
+  }
+}