JavaNoobPig

public class BubbleSortAlgorithm implements SortAlgorithm{
	public int[] sort(int[] numbers) {
		// Logic for Bubble Sort
		return numbers;
	}
}

JavaNoobPig

public class QuickSortAlgorithm implements SortAlgorithm{
	public int[] sort(int[] numbers) {
		// Logic for Quick Sort
		return numbers;
	}
}

JavaNoobPig

public class BinarySearchImpl {
	
	private SortAlgorithm sortAlgorithm;
	
	public BinarySearchImpl(SortAlgorithm sortAlgorithm) {
		super();
		this.sortAlgorithm = sortAlgorithm;
	}

	public int binarySearch(int [] numbers,int numberToSearchFor) {

JavaNoobPig

@SpringBootApplication
public class SpringIn5StepsApplication {

	public static void main(String[] args) {
		
		BinarySearchImpl binarySearch=new BinarySearchImpl(new BubbleSortAlgorithm());
		
		int result = binarySearch.binarySearch(new int[] {12,4,6},3);
		System.out.println(result);
		

JavaNoobPig

@Component            //告訴Spring "BinarySearchImpl"視為Component
public class BinarySearchImpl {
	
	@Autowired          //告訴Spring 自動導入一個"sortAlgorithm"
	private SortAlgorithm sortAlgorithm;
	
	public BinarySearchImpl(SortAlgorithm sortAlgorithm) {
		super();
		this.sortAlgorithm = sortAlgorithm;
	}

JavaNoobPig

@Component            //告訴spring "BubbleSortAlgorithm"視為Bean
public class BubbleSortAlgorithm implements SortAlgorithm{
	public int[] sort(int[] numbers) {
		// Logic for Bubble Sort
		return numbers;
	}
}

JavaNoobPig

public class QuickSortAlgorithm implements SortAlgorithm{
	public int[] sort(int[] numbers) {
		// Logic for Quick Sort
		return numbers;
	}
}

JavaNoobPig

@SpringBootApplication   //Spring看到這個註解，會自動掃瞄所在之package有沒有@Component @Autowired等
public class SpringIn5StepsApplication {

	public static void main(String[] args) {		
		ApplicationContext applicationContext =    //Spring的管理器，管理所有的Bean
				SpringApplication.run(SpringIn5StepsApplication.class, args);
		
//		BinarySearchImpl binarySearch=new BinarySearchImpl(new QuickSortAlgorithm()); 
		//↑改透過Spring的管理器取得"BinarySearchImpl"實例
                //前面已透過@Component告訴Spring"BinarySearchImpl"為Bean

JavaNoobPig

logging.level.org.springframework = debug

JavaNoobPig

@Component
public class QuickSortAlgorithm implements SortAlgorithm{
	public int[] sort(int[] numbers) {
		// Logic for Quick Sort
		return numbers;
	}
}