[SpringBoot2.4.3] Serviceクラスを使用する

.com.example.demo.service
RandomNumberService.java

package com.example.demo.service;

import org.springframework.stereotype.Service;

@Service
public class RandomNumberService {
	
	public int zeroToNine() {
		return (int)(Math.random() * 10);
	}
}

HelloController.java

package com.example.demo;

import java.util.Collections;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.service.RandomNumberService;

@RestController
public class HelloController {
	
	@Autowired
	RandomNumberService random;

	@RequestMapping("/random")
	public Map<String, Integer>random(){
		int value = random.zeroToNine();
		return Collections.singletonMap("value", value);
	}
}

http://localhost:8080/random
{“value”:2}

autowiredで呼び出すのか。。