【Java每日一題】20161104，java20161104

【Java每日一題】20161104，java20161104

package Nov2016;

public class Ques1104 {

    private String num;

    public void setNum(String num){
        num = num;  // 1
        this.num = num;  // 2
    }

    public String getNum(){
        return num;
    }
}

今日問題： 
注釋1和2兩處的作用是否一樣？（點擊以下“【Java每日一題】20161104”查看20161103問題解析） 


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