BookThis.java

package kr.ac.kookmin.cs.oop.ch4;

public class BookThis {
	String title;
	String author;
	void show() {System.out.println(title +"" + author); }
	
	public BookThis() {
		this("","");
		System.out.println("생성자 호출됨");
	}
	public BookThis(String title) {
		this(title,"작자미상"); // this 메소드가 (괄호 안이면 또 다른 생성자를 가르침)
	}
	
	public BookThis(String title, String author) {
		this.title = title; this.author = author; // 필드를 가르치고 
	}

	public static void main(String[] args) {
		BookThis littlePrince = new BookThis("어린왕자","생텍쥐페리");
		BookThis loveStory = new BookThis("춘항전");
		BookThis emptyBook = new BookThis();
		loveStory.show();
		littlePrince.show();
		emptyBook.show();

	}

}