생성자

public class Book {
	String title;
	String author;
	
	void show()
	{
		System.out.println(title+" "+ author);
	}
	
	public Book()
	{
		this("","");
		System.out.println("생성자 호출됨");
	}
	
	public Book(String title)
	{
		this(title,"작자 미상");
	}
	
	public Book(String title, String author)
	{
		this.title=title;
		this.author=author;
	}
	
	public static void main(String[] args)
	{
		Book littlePrince=new Book("어린 왕자","생택쥐페리");
		Book loveStory=new Book("춘향전");
		Book emptyBook=new Book();
		littlePrince.show();
		loveStory.show();
	
	}
	
}