Spring. @Autowire , Dependency Injection

 package com.example.demo;

import org.springframework.stereotype.Component;

@Component("lap")

public class Laptop {

private int lid;

private String brand;

public int getLid() {

return lid;

}

public void setLid(int lid) {

this.lid = lid;

}

public String getBrand() {

return brand;

}

public void setBrand(String brand) {

this.brand = brand;

}

@Override

public String toString() {

return "Laptop [lid=" + lid + ", brand=" + brand + "]";

}

public void compile() {

System.out.println("compilig");

}

}

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Component;

@Component

//@Scope("singleton")

public class Alien {

private int aid;

private String aname;

private String tech;

@Autowired

@Qualifier("lap")

private Laptop laptop;

public Alien() {

super();

System.out.println("Object created");

}

public int getAid() {

return aid;

}

public void setAid(int aid) {

this.aid = aid;

}

public String getAname() {

return aname;

}

public void setAname(String aname) {

this.aname = aname;

}

public String getTech() {

return tech;

}

public void setTech(String tech) {

this.tech = tech;

}

public Laptop getLaptop() {

return laptop;

}

public void setLaptop(Laptop laptop) {

this.laptop = laptop;

}

public void show() {

System.out.println("in show");

laptop.compile();

}

}

package com.example.demo;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication

public class DemoApplication {

public static void main(String[] args) {

ConfigurableApplicationContext context = SpringApplication.run(DemoApplication.class, args);

Alien a = context.getBean(Alien.class);

a.show();

}

}