{"id":942,"date":"2014-03-12T07:21:18","date_gmt":"2014-03-12T14:21:18","guid":{"rendered":"http:\/\/10kdev.net\/?p=942"},"modified":"2014-03-12T09:23:23","modified_gmt":"2014-03-12T16:23:23","slug":"final-variables-in-groovy-curiosity","status":"publish","type":"post","link":"http:\/\/10kdev.net\/?p=942","title":{"rendered":"Final Variables in Groovy Curiosity"},"content":{"rendered":"

(On my local I’m running Groovy 2.1.9 on Java\/JDK 6).<\/p>\n

Was having a Discussion of final<\/strong> <\/em>and static<\/strong><\/em>, and decided to try something in groovyConsole.\u00a0 In the Java world, a final variable cannot be reassigned a value once initialized.<\/p>\n

Groovy Code:<\/p>\n

final String i = “test”
\nprintln i
\ni = “red”
println i<\/p>\n

Output:<\/p>\n

groovy> final String i = “test”
\ngroovy> println i
\ngroovy> i = “red”
\ngroovy> println i<\/p>\n

test
red<\/p>\n

\u00a0Interesting — Groovy completely ignored final<\/strong><\/em>.\u00a0 If I plug the code into a Java compiler I get a compilation error — can’t reassign.<\/p>\n

I sent this off to a buddy of mine who teaches Groovy to corporate and he found it odd, and said this behavior happens for this example as well:<\/p>\n

Groovy Code:<\/p>\n

def junk() {
\nfinal int a = 42;
\na = 99;
\n}<\/p>\n

println junk()<\/p>\n

Output:<\/p>\n

groovy> def junk() {
\ngroovy> final int a = 42;
\ngroovy> a = 99;
\ngroovy> }
\ngroovy> print junk()<\/p>\n

99<\/p>\n

The discussion is a little extended, found this though — the issue for final is still open as of this date (March 12, 2014):<\/p>\n

http:\/\/jira.codehaus.org\/browse\/GROOVY-4681<\/p>\n","protected":false},"excerpt":{"rendered":"

(On my local I’m running Groovy 2.1.9 on Java\/JDK 6). Was having a Discussion of final and static, and decided to try something in groovyConsole.\u00a0 In the Java world, a final variable cannot be reassigned a value once initialized. Groovy Code: final String i = “test” println i i = “red”println i Output: groovy> final […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[23,24],"tags":[],"_links":{"self":[{"href":"http:\/\/10kdev.net\/index.php?rest_route=\/wp\/v2\/posts\/942"}],"collection":[{"href":"http:\/\/10kdev.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/10kdev.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/10kdev.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/10kdev.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=942"}],"version-history":[{"count":6,"href":"http:\/\/10kdev.net\/index.php?rest_route=\/wp\/v2\/posts\/942\/revisions"}],"predecessor-version":[{"id":948,"href":"http:\/\/10kdev.net\/index.php?rest_route=\/wp\/v2\/posts\/942\/revisions\/948"}],"wp:attachment":[{"href":"http:\/\/10kdev.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=942"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/10kdev.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=942"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/10kdev.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}