{"id":921,"date":"2018-09-17T18:25:40","date_gmt":"2018-09-17T09:25:40","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=921"},"modified":"2018-12-23T02:00:59","modified_gmt":"2018-12-22T17:00:59","slug":"string-lpad-rpad","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/en\/blog\/java\/string-lpad-rpad","title":{"rendered":"Shaped by Java LPAD and RPAD"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java LPAD\u3001RPAD\u3067\u6574\u5f62\u3002\u6587\u5b57\u5217\u306e\u5de6\u53f3\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u3092\u57cb\u3081\u308b<\/a><\/h2>\n<p>\n<strong>Java<\/strong>\u3067\u3001\u6587\u5b57\u5217\u306b\u5bfe\u3057SQL\u95a2\u6570\u306e<strong>LPAD<\/strong>\u3001<strong>RPAD<\/strong>\u3068\u540c\u69d8\u306e\u51e6\u7406\u3092\u884c\u3046\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n\u3053\u308c\u3089\u306f<strong>\u56fa\u5b9a\u9577\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong>\u3092\u6271\u3046\u3068\u304d\u306b\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002\n<\/p>\n<ul>\n<li><strong>LPAD<\/strong>\u30fb\u30fb\u30fb\u5168\u4f53\u306e\u6587\u5b57\u6570\u304c\u6307\u5b9a\u306e\u6841\u6570\u306b\u306a\u308b\u3088\u3046\u306b\u6587\u5b57\u5217\u306e\u5de6\u5074\u306b\u7e70\u308a\u8fd4\u3057\u6587\u5b57\u5217\u3092\u57cb\u3081\u3066\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<li><strong>RPAD<\/strong>\u30fb\u30fb\u30fb\u5168\u4f53\u306e\u6587\u5b57\u6570\u304c\u6307\u5b9a\u306e\u6841\u6570\u306b\u306a\u308b\u3088\u3046\u306b\u6587\u5b57\u5217\u306e\u53f3\u5074\u306b\u7e70\u308a\u8fd4\u3057\u6587\u5b57\u5217\u3092\u57cb\u3081\u3066\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><script type=\"text\/javascript\" src=\"https:\/\/chat-messenger.com\/js\/common.js?dd12sssas2223\" charset=\"UTF-8\"><\/script><br \/>\n<script type=\"text\/javascript\"> writePR(); <\/script><\/p>\n<h2 class=\"common_title\"><a name=\"1\">\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0<\/a><\/h2>\n<p><textarea readonly=\"readonly\" style=\"font-size: 13px;height: 400px;\" class=\"src\" onclick=\"this.focus();this.select()\">\/**<br \/>\n * LPAD\u3092\u884c\u3044\u307e\u3059\u3002<br \/>\n * \u6587\u5b57\u5217[str]\u306e\u5de6\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217[addStr]\u3092[len]\u306b<br \/>\n * \u6e80\u305f\u3059\u307e\u3067\u633f\u5165\u3057\u307e\u3059\u3002<br \/>\n * @param str \u5bfe\u8c61\u6587\u5b57\u5217<br \/>\n * @param len \u88dc\u5145\u3059\u308b\u307e\u3067\u306e\u6841\u6570\uff08LPAD\u3092\u884c\u3063\u305f\u5f8c\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\uff09<br \/>\n * @param addStr \u633f\u5165\u3059\u308b\u6587\u5b57\u5217<br \/>\n * @return \u5909\u63db\u5f8c\u306e\u6587\u5b57\u5217\u3002<br \/>\n *\/<br \/>\npublic static String lpad(String str, int len, String addStr) {<br \/>\n    return fillString(str, &#8220;L&#8221;, len, addStr);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * RPAD\u3092\u884c\u3044\u307e\u3059\u3002<br \/>\n * \u6587\u5b57\u5217[str]\u306e\u53f3\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217[addStr]\u3092[len]\u306b<br \/>\n * \u6e80\u305f\u3059\u307e\u3067\u633f\u5165\u3057\u307e\u3059\u3002<br \/>\n * @param str \u5bfe\u8c61\u6587\u5b57\u5217<br \/>\n * @param len \u88dc\u5145\u3059\u308b\u307e\u3067\u306e\u6841\u6570\uff08RPAD\u3092\u884c\u3063\u305f\u5f8c\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\uff09<br \/>\n * @param addStr \u633f\u5165\u3059\u308b\u6587\u5b57\u5217<br \/>\n * @return \u5909\u63db\u5f8c\u306e\u6587\u5b57\u5217\u3002<br \/>\n *\/<br \/>\npublic static String rpad(String str, int len, String addStr) {<br \/>\n    return fillString(str, &#8220;R&#8221;, len, addStr);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * \u6587\u5b57\u5217[str]\u306b\u5bfe\u3057\u3066\u3001\u88dc\u5145\u3059\u308b\u6587\u5b57\u5217[addStr]\u3092<br \/>\n * [position]\u306e\u4f4d\u7f6e\u306b[len]\u306b\u6e80\u305f\u3059\u307e\u3067\u633f\u5165\u3057\u307e\u3059\u3002<br \/>\n *<br \/>\n * \u203b[str]\u304cnull\u3084\u7a7a\u30ea\u30c6\u30e9\u30eb\u306e\u5834\u5408\u3067\u3082[addStr]\u3092<br \/>\n * [len]\u306b\u6e80\u305f\u3059\u307e\u3067\u633f\u5165\u3057\u305f\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002<br \/>\n * @param str \u5bfe\u8c61\u6587\u5b57\u5217<br \/>\n * @param position \u524d\u306b\u633f\u5165 \u21d2 L or l \u5f8c\u306b\u633f\u5165 \u21d2 R or r<br \/>\n * @param len \u88dc\u5145\u3059\u308b\u307e\u3067\u306e\u6841\u6570<br \/>\n * @param addStr \u633f\u5165\u3059\u308b\u6587\u5b57\u5217<br \/>\n * @return \u5909\u63db\u5f8c\u306e\u6587\u5b57\u5217\u3002<br \/>\n *\/<br \/>\npublic static String fillString(String str, String position,<br \/>\n        int len,<br \/>\n        String addStr) {<br \/>\n    if (addStr == null || addStr.length() == 0) {<br \/>\n        throw new IllegalArgumentException<br \/>\n            (&#8220;\u633f\u5165\u3059\u308b\u6587\u5b57\u5217\u306e\u5024\u304c\u4e0d\u6b63\u3067\u3059\u3002addStr=&#8221;+addStr);<br \/>\n    }<br \/>\n    if (str == null) {<br \/>\n        str = &#8220;&#8221;;<br \/>\n    }<br \/>\n    StringBuffer buffer = new StringBuffer(str);<br \/>\n    while (len &gt; buffer.length()) {<br \/>\n        if (position.equalsIgnoreCase(&#8220;l&#8221;)) {<br \/>\n            int sum = buffer.length() + addStr.length();<br \/>\n            if (sum &gt; len) {<br \/>\n                addStr = addStr.substring<br \/>\n                    (0,addStr.length() &#8211; (sum &#8211; len));<br \/>\n                buffer.insert(0, addStr);<br \/>\n            }else{<br \/>\n                buffer.insert(0, addStr);<br \/>\n            }<br \/>\n        } else {<br \/>\n            buffer.append(addStr);<br \/>\n        }<br \/>\n    }<br \/>\n    if (buffer.length() == len) {<br \/>\n        return buffer.toString();<br \/>\n    }<br \/>\n    return buffer.toString().substring(0, len);<br \/>\n}<br \/>\n<\/textarea><br \/>\n<\/p>\n<h2 class=\"common_title\"><a name=\"2\">\u5b9f\u884c\u7d50\u679c<\/a><\/h2>\n<p>\u25c6\u5b9f\u884c\u4f8b<\/p>\n<pre class=\"sample_src\">public static void main(String[] args) {\r\n    \/\/ lpad\u306e\u5834\u5408\u30025\u6841\u306b\u306a\u308b\u307e\u3067\u5de6\u306b\u30b9\u30da\u30fc\u30b9\u3092\u57cb\u3081\u308b\u3002\r\n    String ret = lpad(\"abc\", 5 , \" \");\r\n    System.out.println(\"'\" + ret + \"'\");\r\n\r\n    \/\/ rpad\u306e\u5834\u5408\u30025\u6841\u306b\u306a\u308b\u307e\u3067\u53f3\u306b\u30b9\u30da\u30fc\u30b9\u3092\u57cb\u3081\u308b\u3002\r\n    ret = rpad(\"abc\", 5 , \" \");\r\n    System.out.println(\"'\" + ret + \"'\");\r\n\r\n    \/\/ null\u306e\u5834\u5408\r\n    ret = rpad(null, 5 , \" \");\r\n    System.out.println(\"'\" + ret + \"'\");\r\n}\r\n<\/pre>\n<p>\u25c6\u51fa\u529b\u7d50\u679c<\/p>\n<pre class=\"console\">'  abc'\r\n'abc  '\r\n'     '\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Java LPAD\u3001RPAD\u3067\u6574\u5f62\u3002\u6587\u5b57\u5217\u306e\u5de6\u53f3\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u3092\u57cb\u3081\u308b Java\u3067\u3001\u6587\u5b57\u5217\u306b\u5bfe\u3057SQL\u95a2\u6570\u306eL [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-921","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/posts\/921","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/comments?post=921"}],"version-history":[{"count":4,"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/posts\/921\/revisions"}],"predecessor-version":[{"id":1892,"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/posts\/921\/revisions\/1892"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/media?parent=921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/categories?post=921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/en\/wp-json\/wp\/v2\/tags?post=921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}