BAEL-3965: Created examples for instance and static factory methods.

spring-core-3/src/main/java/com/baeldung/factorymethod/Bar.java

@@ -0,0 +1,18 @@
+package com.baeldung.factorymethod;
+
+public class Bar {
+
+    private String name;
+
+    public Bar(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

spring-core-3/src/main/java/com/baeldung/factorymethod/Foo.java

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+package com.baeldung.factorymethod;
+
+public class Foo {
+
+}

spring-core-3/src/main/java/com/baeldung/factorymethod/InstanceBarFactory.java

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+package com.baeldung.factorymethod;
+
+public class InstanceBarFactory {
+
+    public Bar createInstance(String name) {
+        return new Bar(name);
+    }
+}

spring-core-3/src/main/java/com/baeldung/factorymethod/InstanceFooFactory.java

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+package com.baeldung.factorymethod;
+
+public class InstanceFooFactory {
+
+    public Foo createInstance() {
+        return new Foo();
+    }
+}

spring-core-3/src/main/java/com/baeldung/factorymethod/SingletonBarFactory.java

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+package com.baeldung.factorymethod;
+
+public class SingletonBarFactory {
+
+    private static final Bar INSTANCE = new Bar("unnamed");
+    
+    public static Bar createInstance(String name) {
+        INSTANCE.setName(name);
+        return INSTANCE;
+    }
+}

spring-core-3/src/main/java/com/baeldung/factorymethod/SingletonFooFactory.java

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+package com.baeldung.factorymethod;
+
+public class SingletonFooFactory {
+
+    private static final Foo INSTANCE = new Foo();
+    
+    public static Foo createInstance() {
+        return INSTANCE;
+    }
+}

spring-core-3/src/test/java/com/baeldung/factorymethod/InstanceBarFactoryIntegrationTest.java

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+package com.baeldung.factorymethod;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("/factorymethod/instance-bar-config.xml")
+public class InstanceBarFactoryIntegrationTest {
+
+    @Autowired
+    private Bar instance;
+    
+    @Test
+    public void givenValidInstanceFactoryConfig_whenCreateInstance_thenNameIsCorrect() {
+        assertNotNull(instance);
+        assertEquals("someName", instance.getName());
+    }
+}

spring-core-3/src/test/java/com/baeldung/factorymethod/InstanceFooFactoryIntegrationTest.java

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+package com.baeldung.factorymethod;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("/factorymethod/instance-foo-config.xml")
+public class InstanceFooFactoryIntegrationTest {
+
+    @Autowired
+    private Foo foo;
+    
+    @Test
+    public void givenValidInstanceFactoryConfig_whenCreateFooInstance_thenInstanceIsNotNull() {
+        assertNotNull(foo);
+    }
+}

spring-core-3/src/test/java/com/baeldung/factorymethod/SingletonBarFactoryIntegrationTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.factorymethod;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("/factorymethod/static-bar-config.xml")
+public class SingletonBarFactoryIntegrationTest {
+
+    @Autowired
+    private Bar instance;
+    
+    @Test
+    public void givenValidStaticFactoryConfig_whenCreateInstance_thenNameIsCorrect() {
+        assertNotNull(instance);
+        assertEquals("someName", instance.getName());
+    }
+}

spring-core-3/src/test/java/com/baeldung/factorymethod/SingletonFooFactoryIntegrationTest.java

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+package com.baeldung.factorymethod;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("/factorymethod/static-foo-config.xml")
+public class SingletonFooFactoryIntegrationTest {
+
+    @Autowired
+    private Foo singleton;
+    
+    @Test
+    public void givenValidStaticFactoryConfig_whenCreateInstance_thenInstanceIsNotNull() {
+        assertNotNull(singleton);
+    }
+}

spring-core-3/src/test/resources/factorymethod/instance-bar-config.xml

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+<?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:util="http://www.springframework.org/schema/util"
+    xsi:schemaLocation="
+        http://www.springframework.org/schema/beans
+        http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/util
+        http://www.springframework.org/schema/util/spring-util.xsd">
+
+    <bean id="instanceBarFactory"
+        class="com.baeldung.factorymethod.InstanceBarFactory" />
+
+    <bean id="bar"
+        factory-bean="instanceBarFactory"
+        factory-method="createInstance">
+        <constructor-arg value="someName" />
+    </bean>
+
+</beans>

spring-core-3/src/test/resources/factorymethod/instance-foo-config.xml

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+<?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:util="http://www.springframework.org/schema/util"
+    xsi:schemaLocation="
+        http://www.springframework.org/schema/beans
+        http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/util
+        http://www.springframework.org/schema/util/spring-util.xsd">
+
+    <bean id="instanceFooFactory"
+        class="com.baeldung.factorymethod.InstanceFooFactory" />
+
+    <bean id="foo"
+        factory-bean="instanceFooFactory"
+        factory-method="createInstance" />
+
+</beans>

spring-core-3/src/test/resources/factorymethod/static-bar-config.xml

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+<?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="
+        http://www.springframework.org/schema/beans
+        http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/context
+        http://www.springframework.org/schema/context/spring-context.xsd
+        http://www.springframework.org/schema/util
+        http://www.springframework.org/schema/util/spring-util.xsd">
+
+	<bean id="bar"
+		class="com.baeldung.factorymethod.SingletonBarFactory"
+		factory-method="createInstance">
+		<constructor-arg value="someName" />	
+	</bean>
+
+</beans>

spring-core-3/src/test/resources/factorymethod/static-foo-config.xml

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+<?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="
+        http://www.springframework.org/schema/beans
+        http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/context
+        http://www.springframework.org/schema/context/spring-context.xsd
+        http://www.springframework.org/schema/util
+        http://www.springframework.org/schema/util/spring-util.xsd">
+
+    <bean id="foo"
+        class="com.baeldung.factorymethod.SingletonFooFactory"
+        factory-method="createInstance" />
+
+</beans>