Now that Java 13 is features complete (Release Candidate at the day of writing), it\u2019s time to walk throught all it\u2019s functionalities that brings to us, developers, this new version.<\/p>\n
This article is part of a series on what\u2019s new on the last versions of Java, for those who wants to read the others, here are the links : Java 12<\/a>, Java 11<\/a>,\u00a0Java 10,<\/a> and Java 9<\/a>.<\/p>\n Force is to note that, again, there is not a lot of new functionalities in this release. Besides the new Text Block that replaces the Raw Strings, there is not a lot of modifications on the JDK.<\/p>\n This is the main new functionality in the version 13 of Java, the capability to write Text Blocks<\/strong> : a new type of String Literal that allow to write them on multiple lines.<\/p>\n Text Blocks don’t add a lot of new functionalities (they are not raw string, there is no string interpolation, …), they only allow to write strings on multiple lines, and automatically manage the indentation for us. Instead of using a single escape character, they use an escape sequence: Speaking of indentation, this is what is the most specific about this new functionality : a complex algorithm has been implemented to keep the indentation as the developer intended to define<\/em> it. Concretely, the indentation is done by deleting the identation before the first letter (so here we delete the indentation before the H of Hello), this is called the incidental indentation.<\/p>\n The main rules of Text Blocks are :<\/p>\n To implement Text Blocks, new methods has been added to the String class. But as this functionality is a preview feature, you need to activate it via More info : https:\/\/openjdk.java.net\/jeps\/355<\/a><\/a> and in this very complete article by Nicolai Parlog : https:\/\/blog.codefx.org\/java\/text-blocks\/<\/a><\/a><\/p>\n You can also read the Programmer’s Guide To Text Blocks <\/em>by Jim Laskey and Stuart Marks : http:\/\/cr.openjdk.java.net\/~jlaskey\/Strings\/TextBlocksGuide_v8.html<\/a><\/a><\/p>\n Unfortunately, Switch Expressions stays in preview! Their implementation has been modified, a new keyword The idea behind this is to be able to reuse this keyword later (for example for if expression ?).<\/p>\n More info in the JEP : https:\/\/openjdk.java.net\/jeps\/354<\/a><\/a><\/p>\n A lot of news in Shenandoah, the new GC implemented par Red Hat and integrated into OpenJDK.<\/p>\n The more important ones are the support of 32 bits JVM and the elimination of the forwarding pointer word\u00a0<\/em>that allow to reduce the memory footprint of Shenandoah with the addons of load reference barriers.<\/em><\/p>\n More info in this series of 3 posts on the Red Hat blog : https:\/\/developers.redhat.com\/blog\/?p=602377<\/a><\/a><\/p>\n Via the JEP 353: Reimplement the Legacy Socket API<\/a>, the API There is also some news around security : https:\/\/seanjmullan.org\/blog\/2019\/08\/05\/jdk13<\/a><\/a><\/p>","protected":false},"excerpt":{"rendered":" Now that Java 13 is features complete (Release Candidate at the day of writing), it\u2019s time to walk throught all it\u2019s functionalities that brings to us, developers, this new version. This article is part of a series on what\u2019s new on the last versions of Java, for those who wants to read the others, here are the links : Java 12, Java 11,\u00a0Java 10, and Java 9. Force is to note that, again, there is not a lot of new…JEP-355: Text Blocks (Preview)<\/h2>\n
"""<\/code><\/p>\nSystem.out.println(\"\"\"\n\u00a0\u00a0\u00a0\u00a0Hello,\n\u00a0\u00a0\u00a0\u00a0multiline\n\u00a0\u00a0\u00a0\u00a0text blocks!\"\"\")\n<\/pre>\n
"""<\/code> and a new line.<\/li>\n\n"""<\/code> without line break. If there is one it will be added to the end of the string !<\/li>\n\n--enable-preview<\/code> to be able to use them : JDK-8203444 – String::formatted, JDK-8223775 – String::stripIndent et JDK-8223781 – String::translateEscapes.<\/p>\nJEP 354 – Switch Expressions (Preview)<\/h2>\n
yield<\/code> has been created to return <\/em>a value from a switch branch. Before we use break "value";<\/code> now we need to use yield "value";<\/code>.<\/p>\nShenandoah:<\/h2>\n
Other<\/h2>\n
java.net.Socket<\/code> and java.net.ServerSocket<\/code> has been totaly rewritten, their implementations dated back to JDK 1.0, and the work in progress on threads, a.k.a. fibers, for the Project Loom<\/a> needed some modifications.<\/p>\n