{"id":28470,"date":"2022-12-31T04:29:59","date_gmt":"2022-12-30T22:59:59","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-in-java-where-does-the-printwriter-write-method-write-the-data-closed\/"},"modified":"2022-12-31T04:29:59","modified_gmt":"2022-12-30T22:59:59","slug":"solved-in-java-where-does-the-printwriter-write-method-write-the-data-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-in-java-where-does-the-printwriter-write-method-write-the-data-closed\/","title":{"rendered":"[Solved] In Java Where does the PrintWriter write() method write the data [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-45779933\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"45779933\" data-parentid=\"45779647\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/lang\/System.html#out\"><code>System.out<\/code><\/a> is a <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/PrintStream.html\"><code>PrintStream<\/code><\/a>, aka an <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/OutputStream.html\"><code>OutputStream<\/code><\/a>, so you&#8217;re calling the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/PrintWriter.html#PrintWriter-java.io.OutputStream-\"><code>PrintWriter(OutputStream out)<\/code><\/a> constructor.<\/p>\n<p>It is equivalent to calling the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/PrintWriter.html#PrintWriter-java.io.Writer-\"><code>PrintWriter(Writer out)<\/code><\/a> with the following argument:<\/p>\n<pre><code>new BufferedWriter(new OutputStreamWriter(out))\n<\/code><\/pre>\n<p>The <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/BufferedWriter.html\"><code>BufferedWriter<\/code><\/a> is injected for performance reasons.<\/p>\n<blockquote>\n<p>where is my data buffered?<\/p>\n<\/blockquote>\n<p>In the <code>BufferedWriter<\/code>.<\/p>\n<blockquote>\n<p>why doesnt &#8220;Hello World&#8221; get printed<\/p>\n<\/blockquote>\n<p>The <code>\"Hello World\"<\/code> text is sitting in that buffer, and since you never flush <code>writer<\/code>, it&#8217;ll never be sent downstream to the <code>System.out<\/code> print stream.<\/p>\n<blockquote>\n<p>What does it mean to pass <code>System.out<\/code> as argument to <code>PrintWriter<\/code> class constructor?<\/p>\n<\/blockquote>\n<p>It means that any text written to the <code>PrintWriter<\/code> will be forwarded to <code>System.out<\/code>. As the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/PrintWriter.html#PrintWriter-java.io.OutputStream-\">javadoc<\/a> says: <em>This convenience constructor creates the necessary intermediate OutputStreamWriter, which will <strong>convert characters into bytes using the default character encoding<\/strong>.<\/em><\/p>\n<blockquote>\n<p>when i uncomment writer.flush() and writer.close() then also i get the same result.<\/p>\n<\/blockquote>\n<p>That is because you already closed <code>System.out<\/code>, so it will not accept any more output. <code>PrintWriter<\/code> silently ignores the error thrown when you try. As the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/io\/PrintWriter.html\">javadoc<\/a> says: <em>Methods in this class <strong>never throw I\/O exceptions<\/strong>, although some of its constructors may. The client may inquire as to whether any errors have occurred by invoking <code>checkError()<\/code>.<\/em><\/p>\n<hr>\n<p><strong>Solution<\/strong><\/p>\n<p>Calling <code>close()<\/code> will automatically call <code>flush()<\/code>, so you don&#8217;t need to call <code>flush()<\/code> before <code>close()<\/code>.<\/p>\n<p>Calling <code>close()<\/code> on the <code>PrintWriter<\/code> will automatically call <code>close()<\/code> on <code>System.out<\/code>, so you don&#8217;t need to do that.<\/p>\n<p>Remove <code>System.out.flush();<\/code>, <code>System.out.close();<\/code>, and <code>writer.flush();<\/code>, and only call <code>writer.close();<\/code>.<\/p>\n<p>Better yet, you should in general never close <code>System.out<\/code>, so just call <code>writer.flush();<\/code>, and leave it open.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved In Java Where does the PrintWriter write() method write the data [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] System.out is a PrintStream, aka an OutputStream, so you&#8217;re calling the PrintWriter(OutputStream out) constructor. It is equivalent to calling the PrintWriter(Writer out) with the following argument: new BufferedWriter(new OutputStreamWriter(out)) The BufferedWriter is injected for performance reasons. where is my data buffered? In the BufferedWriter. why doesnt &#8220;Hello World&#8221; get printed The &#8220;Hello World&#8221; text &#8230; <a title=\"[Solved] In Java Where does the PrintWriter write() method write the data [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-in-java-where-does-the-printwriter-write-method-write-the-data-closed\/\" aria-label=\"More on [Solved] In Java Where does the PrintWriter write() method write the data [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[323],"class_list":["post-28470","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] In Java Where does the PrintWriter write() method write the data [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-in-java-where-does-the-printwriter-write-method-write-the-data-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] In Java Where does the PrintWriter write() method write the data [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] System.out is a PrintStream, aka an OutputStream, so you&#8217;re calling the PrintWriter(OutputStream out) constructor. 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