16:["$","div",null,{"id":"body-div","children":[["$","div",null,{"id":"container","children":[["$","div",null,{"id":"container2","children":[["$","div",null,{"id":"container3","children":[["$","div",null,{"id":"header","children":[["$","div",null,{"id":"banner","children":[["$","h1",null,{"children":["$","a",null,{"href":"https://robertsong.pixnet.net/blog","children":"Robert 的部落格"}]}],["$","p",null,{"className":"skiplink","children":["$","a",null,{"href":"#article-area","title":"skip the page header to the main content","children":"跳到主文"}]}],["$","h2",null,{"suppressHydrationWarning":true,"dangerouslySetInnerHTML":{"__html":"歡迎光臨Robert 在痞客邦的小天地\n"}}],["$","p",null,{"id":"blog-category","children":["部落格全站分類：",["$","a",null,{"href":"#","children":"數位生活"}]]}]]}],["$","ul",null,{"id":"navigation","children":[["$","li",null,{"className":"navigation-links","id":"link-album","children":["$","a",null,{"href":"/albums","title":"go to gallery page of this user","children":"相簿"}]}],["$","li",null,{"className":"navigation-links","id":"link-blog","children":["$","a",null,{"href":"https://robertsong.pixnet.net/blog","title":"go to index page of this blog","children":"部落格"}]}],["$","li",null,{"className":"navigation-links","id":"link-guestbook","children":["$","a",null,{"id":"guestbook","data-msg":"尚未安裝留言板，無法進行留言","data-action":"none","href":"#","title":"go to guestbook page of this user","children":"留言"}]}],["$","li",null,{"className":"navigation-links","id":"link-profile","children":["$","a",null,{"href":"https://www.pixnet.net/pcard/5935736","title":"go to profile page of this user","children":"名片"}]}]]}]]}],["$","div",null,{"id":"main","children":[["$","div",null,{"id":"content","children":["$","div",null,{"id":"article-area","children":["$","div",null,{"id":"article-box","children":["$","div",null,{"className":"article","children":[["$","ul",null,{"className":"article-head","children":[["$","li",null,{"className":"publish","children":[["$","span",null,{"className":"month","children":["5月"," "]}],["$","span",null,{"className":"date","children":["16"," "]}],["$","span",null,{"className":"day","children":["週三"," "]}],["$","span",null,{"className":"year","children":"2018"}],["$","span",null,{"className":"time","children":"10:59"}]]}],["$","li",null,{"className":"title","id":"article-13345758063","data-site-category":"進修深造","data-site-category-id":8,"data-article-link":"https://robertsong.pixnet.net/blog/posts/13345758063","children":["$","h2",null,{"children":["$","a",null,{"href":"https://robertsong.pixnet.net/blog/posts/13345758063","children":"[程式][Java] 字串格式"}]}]}]]}],["$","div",null,{"className":"article-body","children":[["$","div",null,{"className":"article-content","children":[["$","div",null,{"className":"article-content-inner","id":"article-content-inner","suppressHydrationWarning":true,"dangerouslySetInnerHTML":{"__html":"

java.util.Formatter、System.out.printf

\n\n

一直看不懂「%3d」中的「」前字號(dollar sign)是什麼意思...
\n終於看懂了

\n\n

「3」表示後面帶的第3個參數。

\n\n

例如:「 (\"%2d %1d %3s\", a, b, c) 」
\n印出來的會是:先印「b」為整數,後印「a」為整數,再印「c」為字串。

\n\n

參考:
\n JAVA 字串格式化 - 暗黑布萊恩
\n

\n\n

"}}],["$","div",null,{"className":"tag-container-parent","children":[["$","div",null,{"className":"tag-container article-keyword","data-version":"a","children":[["$","div",null,{"className":"tag__header","children":["$","div",null,{"className":"tag__header-title","children":"文章標籤"}]}],["$","div",null,{"className":"tag__main","id":"article-footer-tags","children":[]}]]}],["$","div",null,{"className":"tag-container global-keyword","children":[["$","div",null,{"className":"tag__header","children":["$","div",null,{"className":"tag__header-title","children":"全站熱搜"}]}],["$","div",null,{"className":"tag__main","children":[]}]]}]]}],["$","div",null,{"className":"author-profile","children":[["$","div",null,{"className":"author-profile__header","children":"創作者介紹"}],["$","div",null,{"className":"author-profile__main","id":"mixpanel-author-box","children":[["$","a",null,{"children":["$","img",null,{"className":"author-profile__avatar","src":"https://pimg.1px.tw/robertsong/logo/robertsong.png","alt":"創作者 Robert 的頭像","loading":"lazy"}]}],"$L17","$L18","$L19"]}]]}]]}],"$L1a","$L1b"]}],"$L1c","$L1d"]}]}]}]}],"$L1e"]}],"$L1f"]}],"$L20","$L21","$L22","$L23"]}],"$L24","$L25","$L26","$L27"]}],"$L28","$L29","$L2a","$L2b"]}]

Robert 的部落格

歡迎光臨Robert 在痞客邦的小天地

[程式][Java] 字串格式

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