{"id":2004,"date":"2013-08-05T10:24:46","date_gmt":"2013-08-05T08:24:46","guid":{"rendered":"http:\/\/www.tutego.de\/blog\/javainsel\/?p=2004"},"modified":"2013-08-05T10:24:46","modified_gmt":"2013-08-05T08:24:46","slug":"qa-optimiert-der-java-compiler-die-multiplikation-konstanter-faktoren","status":"publish","type":"post","link":"https:\/\/www.tutego.de\/blog\/javainsel\/2013\/08\/qa-optimiert-der-java-compiler-die-multiplikation-konstanter-faktoren\/","title":{"rendered":"Q&amp;A: Optimiert der Java-Compiler die Multiplikation konstanter Faktoren?"},"content":{"rendered":"<p>Wenn ich in mein Quellcode schreibe:<\/p>\n<pre>int i = 60 * 1000;<\/pre>\n<p>Wie kompiliert javac das? Wird die Rechenoperation schon zur Compile-Zeit ausgef\u00fchrt, oder erst zur Laufzeit?<\/p>\n<p>Antwort: Diese &quot;compile-time constant expression&quot; optimiert der Compiler. Im Bytecode steht dann nur 60000. Siehe dazu auch <a href=\"http:\/\/docs.oracle.com\/javase\/specs\/jls\/se7\/html\/jls-15.html#jls-15.28\">http:\/\/docs.oracle.com\/javase\/specs\/jls\/se7\/html\/jls-15.html#jls-15.28<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Wenn ich in mein Quellcode schreibe: int i = 60 * 1000; Wie kompiliert javac das? Wird die Rechenoperation schon zur Compile-Zeit ausgef\u00fchrt, oder erst zur Laufzeit? Antwort: Diese &quot;compile-time constant expression&quot; optimiert der Compiler. Im Bytecode steht dann nur 60000. Siehe dazu auch http:\/\/docs.oracle.com\/javase\/specs\/jls\/se7\/html\/jls-15.html#jls-15.28.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1],"tags":[],"class_list":["post-2004","post","type-post","status-publish","format-standard","hentry","category-allgemein"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts\/2004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/comments?post=2004"}],"version-history":[{"count":1,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts\/2004\/revisions"}],"predecessor-version":[{"id":2005,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts\/2004\/revisions\/2005"}],"wp:attachment":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/media?parent=2004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/categories?post=2004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/tags?post=2004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}