package?pkGame;
import?java.util.ArrayList;
import?java.util.List;

public?class?pkGame?{


//方法一	
????List<pkCard>cardList;
????public?void?cardList(){
	??cardList=new?ArrayList<pkCard>();
	??}
	??
	??
//方法二
public?List<pkCard>?cardList?=?new?ArrayList<pkCard>();?



//構(gòu)造一副撲克牌
	public?void?cardCreat(){
		?System.out.println("創(chuàng)建一副撲克牌！");
		for?(int?i?=?0;?i?<?13;?i++){??
	????????for?(int?j?=?0;?j?<?4;?j++){????????
	???????//cardList里add添加一副撲克牌
		????cardList.add(new?pkCard(pkCard.colname[j],pkCard.numname[i]));
	????????}
		}
	????
	????int?i=0;
		for(pkCard?pkcard:cardList){
			if(i==4){????????????????????//換行操作?：一個(gè)數(shù)字對(duì)應(yīng)四個(gè)花色
				System.out.println("");
				i=0;
			}			
			if(i!=4){
				System.out.print("<"+pkcard.color+pkcard.number+">"+"?");
				i++;
			}			
		}
		
		System.out.print("\n撲克牌創(chuàng)建成功！");

	}	

	public?static?void?main(String[]?args)?{
	pkGame?pg=new?pkGame();
	pg.cardCreat();
	

	}

}

當(dāng)我把cardList單獨(dú)作為一個(gè)類的時(shí)候可以用方法一，但是把他放到pkGame類中，就出錯(cuò)了，必須改成public?List<pkCard>?cardList?=?new?ArrayList<pkCard>(); 這兩種有什么區(qū)別嗎？？？新手表示不理解額