【Java每日一题】20161104

20161103问题解析请点击今日问题下方的“【Java每日一题】20161104”查看

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;
    }
}

今日问题：
注释1和2两处的作用是否一样？（点击以下“【Java每日一题】20161104”查看20161103问题解析）


题目原发布于公众号、简书：[url=http://mp.weixin.qq.com/s?__biz=MzI4ODEyMTgwMA==&mid=2650163235&idx=1&sn=85a128c39e5c499462d0ade338aa14b7&chksm=f3c1de84c4b657926285cb54817b75abe4103310dc7d6eb95bd5d6a8ba3cf8e2e359ee88d7dc#rd]【Java每日一题】20161104[/url]，[url=http://www.jianshu.com/p/35c8f82a4502]【Java每日一题】20161104[/url]
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[img]https://img-blog.youkuaiyun.com/20161017115128961?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast[/img]