Spring Part 02 - Dependency Injection (Primitives & String)

Spring - Dependency Injection

Dependency Injection using primitives & String

Sample Program for Dependency Injection without using 'Spring Framework'

package com.ah.di.setterdemo;

public class Test {
    public static void main(String[] args) {
        Car car = new Car();
        car.setCarName("Ford");
        car.displayCarInfo();
    }
}

package com.ah.di.setterdemo;

public class Car {

    private String carName;
    
    public void setCarName(String carName) {
        this.carName = carName;
    }

    public void displayCarInfo(){
        System.out.println("Displaying car information"+
                "\n car name : "+carName);
    }
}

Maven Dependency:

<dependency>

  <groupId>org.springframework</groupId>

  <artifactId>spring-context</artifactId>

  <version>5.3.16</version>

</dependency>

Sample Program for Dependency Injection using 'Spring Framework' 

beans_di_setter.xml

<?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="car" class="com.ah.di.setterdemo.Car">
        <property name="carName" value="Ford"/>
        <property name="mileage" value="28"/>
    </bean>
</beans>

package com.ah.di.setterdemo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans_di_setter.xml");
        Car carObj = context.getBean("car", Car.class);
        carObj.displayCarInfo();
    }
}

package com.ah.di.setterdemo;

public class Car {

    private String carName;
    private int mileage;

    public void setMileage(int mileage) {
        this.mileage = mileage;
    }

    public void setCarName(String carName) {
        this.carName = carName;
    }

    public void displayCarInfo(){
        System.out.println("Displaying car information"+
                "\n car name : "+carName+
                "\n mileage : "+mileage);
    }
}

Watch Demo