Evaluation article: Different Types of Bean Injection in Spring

spring-core/src/main/java/com/baeldung/ConstructorApp.java

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+package com.baeldung;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import com.baeldung.model.Student;
+
+public class ConstructorApp {
+    public static void main(String[] args) {
+        ApplicationContext context = new ClassPathXmlApplicationContext("constructor-context.xml");
+
+        Student student = (Student) context.getBean("student");
+        student.introduceMyself();
+    }
+}

spring-core/src/main/java/com/baeldung/SetterApp.java

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+package com.baeldung;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import com.baeldung.model.Student;
+
+public class SetterApp {
+    public static void main(String[] args) {
+        ApplicationContext context = new ClassPathXmlApplicationContext("setter-context.xml");
+
+        Student student = (Student) context.getBean("student");
+        student.introduceMyself();
+    }
+}

spring-core/src/main/java/com/baeldung/model/College.java

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+package com.baeldung.model;
+
+public class College {
+
+    private int id;
+    private String name;
+
+    public College() {
+    }
+
+    public College(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}

spring-core/src/main/java/com/baeldung/model/Student.java

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+package com.baeldung.model;
+
+public class Student {
+
+    private int id;
+    private String name;
+    private College college;
+
+    public Student() {
+    }
+
+    public Student(int id, String name, College college) {
+        this.id = id;
+        this.name = name;
+        this.college = college;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public College getCollege() {
+        return college;
+    }
+
+    public void setCollege(College college) {
+        this.college = college;
+    }
+
+    public void introduceMyself() {
+        System.out.println("My ID is " + id + " and my name is " + name + ". I am a student at " + college.getName() + " College.");
+    }
+
+}

spring-core/src/main/resources/constructor-context.xml

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+<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="student" class="com.baeldung.model.Student">
+		<constructor-arg value="1" />
+		<constructor-arg value="John" />
+		<constructor-arg ref="college" />
+	</bean>
+	
+	<bean id="college" class="com.baeldung.model.College">
+		<constructor-arg value="1" />
+		<constructor-arg value="New York" />
+	</bean>
+
+</beans>

spring-core/src/main/resources/setter-context.xml

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+<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="college" class="com.baeldung.model.College">
+		<property name="id" value="2" />
+		<property name="name" value="Pittsburgh" />
+	</bean>
+
+	<bean id="student" class="com.baeldung.model.Student">
+		<property name="id" value="2" />
+		<property name="name" value="Tom" />
+		<property name="college">
+			<ref bean="college" />
+		</property>
+	</bean>
+
+</beans>