객체생성

package testjava;


public class Board {
	
	private  static int bno; // 필드 
	
	public int setboard() { return this.bno;} // 메소드1
	public int getboard() {return this.bno;} // static 메소드2
	
}





package testjava;

public class Board2 {
	public static int bno;
	
	private static Board2 board = new Board2(); // 싱글톤
	public static Board2 getInstance() {return board;} 
	
	public  int setboard () {return bno;}  // 메소드1
	public  int getboard() { return bno;} // static 메소드2
	
}







package testjava;

public class test {
 // getboard() 와 setboard() [호출하는 방법 -5가지]
	
	// 1. new 를 쓰는방법
	Board2 boardtest = new Board2();
	int testvalue1 = boardtest.getboard();
	int testvalue2 = boardtest.setboard();
	
	
	// 2. @Autowird
//	@Autowird
	private Board2 board3;
	int testvalue5 = board3.getboard();
	int testvalue6 = board3.setboard();
	
	
	// 싱글톤 
	Board2 boardObject = Board2.getInstance();
	int testvalue3 = boardObject.getboard();
	int testvalue4 = boardObject.setboard();
	
	
	
	
}