Master (#1250)

* Bean Injection Project is added

Different Types of Bean Injection article codes are added.

* Java-based configuration added

Java-based configuration and tests are added. Coding styles are fixed.

* List of Lists Article Codes added.

List of Lists Article Codes added.

core-java/src/main/java/com/baeldung/list/listoflist/Pen.java

@@ -0,0 +1,18 @@
+package com.baeldung.list.listoflist;
+
+public class Pen implements Stationery {
+
+    public String name;
+
+    public Pen(String name) {
+        this.name = name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+}

core-java/src/main/java/com/baeldung/list/listoflist/Pencil.java

@@ -0,0 +1,18 @@
+package com.baeldung.list.listoflist;
+
+public class Pencil implements Stationery{
+    
+    public String name;
+    
+    public Pencil(String name) {
+        this.name = name;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+}

core-java/src/main/java/com/baeldung/list/listoflist/Rubber.java

@@ -0,0 +1,18 @@
+package com.baeldung.list.listoflist;
+
+public class Rubber implements Stationery {
+
+    public String name;
+
+    public Rubber(String name) {
+        this.name = name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+}

core-java/src/main/java/com/baeldung/list/listoflist/Stationery.java

@@ -0,0 +1,5 @@
+package com.baeldung.list.listoflist;
+
+public interface Stationery {
+
+}

core-java/src/test/java/com/baeldung/list/listoflist/ListOfListsTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.list.listoflist;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Before;
+import org.junit.Test;
+
+public class ListOfListsTest {
+
+    private List<ArrayList<? extends Stationery>> listOfLists = new ArrayList<ArrayList<? extends Stationery>>();
+    private ArrayList<Pen> penList = new ArrayList<>();
+    private ArrayList<Pencil> pencilList = new ArrayList<>();
+    private ArrayList<Rubber> rubberList = new ArrayList<>();
+
+    @SuppressWarnings("unchecked")
+    @Before
+    public void init() {
+        listOfLists.add(penList);
+        listOfLists.add(pencilList);
+        listOfLists.add(rubberList);
+
+        ((ArrayList<Pen>) listOfLists.get(0)).add(new Pen("Pen 1"));
+        ((ArrayList<Pencil>) listOfLists.get(1)).add(new Pencil("Pencil 1"));
+        ((ArrayList<Rubber>) listOfLists.get(2)).add(new Rubber("Rubber 1"));
+    }
+
+    @Test
+    public void givenListOfLists_thenCheckNames() {
+        assertEquals("Pen 1", ((Pen) listOfLists.get(0)
+            .get(0)).getName());
+        assertEquals("Pencil 1", ((Pencil) listOfLists.get(1)
+            .get(0)).getName());
+        assertEquals("Rubber 1", ((Rubber) listOfLists.get(2)
+            .get(0)).getName());
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    public void givenListOfLists_whenRemovingElements_thenCheckNames() {
+        ((ArrayList<Pencil>) listOfLists.get(1)).remove(0);        
+        listOfLists.remove(1);
+        assertEquals("Rubber 1", ((Rubber) listOfLists.get(1)
+            .get(0)).getName());
+        listOfLists.remove(0);
+        assertEquals("Rubber 1", ((Rubber) listOfLists.get(0)
+            .get(0)).getName());
+    }
+}

spring-all/src/main/java/org/baeldung/bean/config/ConstructorBasedShipConfig.java

@@ -0,0 +1,20 @@
+package org.baeldung.bean.config;
+
+import org.baeldung.bean.injection.Helm;
+import org.baeldung.bean.injection.Ship;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ConstructorBasedShipConfig {
+
+    @Bean
+    public Ship ship() {
+        return new Ship(helm());
+    }
+
+    @Bean
+    public Helm helm() {
+        return new Helm();
+    }
+}

spring-all/src/main/java/org/baeldung/bean/config/SetterBasedShipConfig.java

@@ -0,0 +1,18 @@
+package org.baeldung.bean.config;
+
+import org.baeldung.bean.injection.Helm;
+import org.baeldung.bean.injection.Ship;
+import org.springframework.context.annotation.Bean;
+
+public class SetterBasedShipConfig {
+
+    @Bean
+    public Ship ship() {
+        return new Ship();
+    }
+
+    @Bean
+    public Helm helm() {
+        return new Helm();
+    }
+}

spring-all/src/main/java/org/baeldung/bean/injection/Helm.java

@@ -0,0 +1,14 @@
+package org.baeldung.bean.injection;
+
+public class Helm {
+    
+    private String brandOfHelm = "HelmBrand";
+
+    public String getBrandOfHelm() {
+        return brandOfHelm;
+    }
+
+    public void setBrandOfHelm(String brandOfHelm) {
+        this.brandOfHelm = brandOfHelm;
+    }
+}

spring-all/src/main/java/org/baeldung/bean/injection/Ship.java

@@ -0,0 +1,26 @@
+package org.baeldung.bean.injection;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class Ship {
+
+    @Autowired
+    private Helm helm;
+
+    public Ship() {
+        helm = new Helm();
+    }
+
+    public Ship(Helm helm) {
+        this.helm = helm;
+    }
+
+    @Autowired
+    public void setHelm(Helm helm) {
+        this.helm = helm;
+    }
+
+    public Helm getHelm() {
+        return this.helm;
+    }
+}

spring-all/src/main/resources/basicConfigForPropertiesTwo.xml

@@ -1,12 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
-    xmlns:util="http://www.springframework.org/schema/util"
-    xsi:schemaLocation="
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
+	xmlns:util="http://www.springframework.org/schema/util"
+	xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
       http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd
-      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"
->
+      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">
 
-    <context:property-placeholder location="classpath:bar.properties" order="2"/>
+	<context:property-placeholder location="classpath:bar.properties"
+		order="2" />
 
 </beans>

spring-all/src/main/resources/beanInjection-constructor.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans 
+	   					   http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+	<bean id="ship" class="org.baeldung.bean.injection.Ship">
+		<constructor-arg>
+			<ref bean="helm" />
+		</constructor-arg>
+	</bean>
+
+	<bean id="helm" class="org.baeldung.bean.injection.Helm" />
+
+</beans>

spring-all/src/main/resources/beanInjection-setter.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans 
+	   					   http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+	<bean id="ship" class="org.baeldung.bean.injection.Ship">
+		<property name="helm">
+			<ref bean="helm" />
+		</property>
+	</bean>
+
+	<bean id="helm" class="org.baeldung.bean.injection.Helm" />
+
+</beans>

spring-all/src/test/java/org/baeldung/bean/injection/ConstructorBasedBeanInjectionWithJavaConfigTest.java

@@ -0,0 +1,23 @@
+package org.baeldung.bean.injection;
+
+import org.baeldung.bean.config.ConstructorBasedShipConfig;
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class ConstructorBasedBeanInjectionWithJavaConfigTest {
+    private static final String HELM_NAME = "HelmBrand";
+
+    @Test
+    public void givenJavaConfigFile_whenUsingConstructorBasedBeanInjection_thenCorrectHelmName() {
+
+        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+        ctx.register(ConstructorBasedShipConfig.class);
+        ctx.refresh();
+
+        Ship ship = ctx.getBean(Ship.class);
+
+        Assert.assertEquals(HELM_NAME, ship.getHelm()
+            .getBrandOfHelm());
+    }
+}

spring-all/src/test/java/org/baeldung/bean/injection/ConstructorBasedBeanInjectionWithXMLConfigTest.java

@@ -0,0 +1,20 @@
+package org.baeldung.bean.injection;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class ConstructorBasedBeanInjectionWithXMLConfigTest {
+
+    private static final String HELM_NAME = "HelmBrand";
+
+    @Test
+    public void givenXMLConfigFile_whenUsingConstructorBasedBeanInjection_thenCorrectHelmName() {
+        final ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beanInjection-constructor.xml");
+
+        final Ship shipConstructorBean = (Ship) applicationContext.getBean("ship");
+        Assert.assertEquals(HELM_NAME, shipConstructorBean.getHelm()
+            .getBrandOfHelm());
+    }
+}

spring-all/src/test/java/org/baeldung/bean/injection/SetterBasedBeanInjectionWithJavaConfigTest.java

@@ -0,0 +1,24 @@
+package org.baeldung.bean.injection;
+
+import org.baeldung.bean.config.SetterBasedShipConfig;
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class SetterBasedBeanInjectionWithJavaConfigTest {
+
+    private static final String HELM_NAME = "HelmBrand";
+
+    @Test
+    public void givenJavaConfigFile_whenUsingSetterBasedBeanInjection_thenCorrectHelmName() {
+
+        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+        ctx.register(SetterBasedShipConfig.class);
+        ctx.refresh();
+
+        Ship ship = ctx.getBean(Ship.class);
+
+        Assert.assertEquals(HELM_NAME, ship.getHelm()
+            .getBrandOfHelm());
+    }
+}

spring-all/src/test/java/org/baeldung/bean/injection/SetterBasedBeanInjectionWithXMLConfigTest.java

@@ -0,0 +1,20 @@
+package org.baeldung.bean.injection;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class SetterBasedBeanInjectionWithXMLConfigTest {
+
+    private static final String HELM_NAME = "HelmBrand";
+
+    @Test
+    public void givenXMLConfigFile_whenUsingSetterBasedBeanInjection_thenCorrectHelmName() {
+        final ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beanInjection-setter.xml");
+
+        final Ship shipSetterBean = (Ship) applicationContext.getBean("ship");
+        Assert.assertEquals(HELM_NAME, shipSetterBean.getHelm()
+            .getBrandOfHelm());
+    }
+}