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為何在主函數(shù)創(chuàng)建對象,調(diào)用方法的時(shí)候會出錯(cuò)???

package?com.imooc11;import?java.util.ArrayList;import?java.util.HashSet;import?java.util.List;import?java.util.Set;public?class?Puke?{	//創(chuàng)建撲克牌屬性(沒想到)	public?String?num;	public?String?color;	public?String?str1[]={"?"};	public?String?str2[]={"?"};public?List<Puke>pukes;??//定義存放撲克容器//對象實(shí)例化public?Puke(String?color,String?num){	this.num=num;	this.color=color;	this.pukes=new?ArrayList<Puke>();}//創(chuàng)建52張撲克牌public?void?creatPuke(){	String?str1[]={"黑桃","紅桃","梅花","方片"};	String?str2[]={"2","3","4","5","6","7","8","9","10","J","Q","K","A"};	for(int?i=0;i<str1.length;i++){		for(int?j=0;j<str2.length;j++){			Puke?pk=new?Puke(str1[i],str2[j]);			pukes.add(pk);		}	}}/*?*?遍歷撲克牌?*/public?void?forPuke(){	System.out.println("******52張撲克牌******");	for?(Puke?pk:pukes){		System.out.println(pk.color+":"+pk.num);	}}	public?static?void?main(String[]?args)?{		//?TODO?Auto-generated?method?stub		Puke?pk=new?Puke();			}}


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為何在主函數(shù)創(chuàng)建對象,調(diào)用方法的時(shí)候會出錯(cuò)???

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