{"id":9382,"date":"2015-03-30T20:20:49","date_gmt":"2015-03-30T20:20:49","guid":{"rendered":"http:\/\/www.oracletutoring.ca\/blog\/?p=9382"},"modified":"2015-03-30T20:20:49","modified_gmt":"2015-03-30T20:20:49","slug":"java-number-formatting-locale","status":"publish","type":"post","link":"https:\/\/www.oracletutoring.ca\/blog\/java-number-formatting-locale\/","title":{"rendered":"Java number formatting: Locale"},"content":{"rendered":"

The tutor continues about number formatting with Java.<\/h1>\n

We don’t live in countries any more; rather,\u00a0 we live in the world.\u00a0 Right now, for instance, my family is off in the US.\u00a0 I’m not with them; I stayed home to run the business.\u00a0 In fact, I’m not a traveller.<\/p>\n

I learn about the world from print, which is how\u00a0 I recently became aware that number formats vary from country to country.\u00a0 Behold the many faces of 1 139 275.78:<\/p>\n\n\n\n\n\n
France<\/td>\n1 139 275,78<\/td>\n<\/tr>\n
Germany<\/td>\n1.139.275,78<\/td>\n<\/tr>\n
US, Canada, English<\/td>\n1,139,275.78<\/td>\n<\/tr>\n
Canada (French)<\/td>\n1 139 275,78<\/td>\n<\/tr>\n<\/table>\n

Notice that none of those nation-specific formats is the way I write the number (once again: 1 139 275.78). I was taught that, in Metric, the thousands separators are spaces, not commas. Yet, being in an English-speaking country, I use a decimal point rather than a comma. It’s an interesting mash of formats that I believe scientifically-educated North Americans commonly use:)<\/p>\n

Being an international programming language, Java is prepared to accommodate the number formats used in different countries. Java calls a country a locale<\/span>.<\/p>\n

I wrote two earlier posts on Java decimal number formatting here<\/a> and here<\/a>. Any Java programmer who is reading this article likely wants the key lines that enable a program to translate a number from one country’s format to another’s. You start with an instance of NumberFormat, setting it with the desired locale:
\n
\nNumberFormat numform = NumberFormat.getInstance(Locale.COUNTRY)
\n<\/span>
\nFor example, to get the format used in France:<\/p>\n

NumberFormat numform0 = NumberFormat.getInstance(Locale.FRANCE);<\/span><\/p>\n

Next, you cast the NumberFormat instance into a DecimalFormat object:<\/p>\n

DecimalFormat decform0 = (DecimalFormat)numform0;
\n<\/span><\/p>\n

Finally, you apply the format descriptor string; for example,<\/p>\n

decform0.applyPattern(“#,##0.00”);<\/span><\/p>\n

Now, you can format number num0<\/span> to String string0<\/span>, in the style of France:<\/p>\n

string0 = decform0.format(num0);<\/span><\/p>\n

To use the above code effectively, you’ll need to include the lines
\n
\nimport java.text.NumberFormat;
\nimport java.text.DecimalFormat;
\nimport java.util.Locale;
\n<\/span><\/p>\n

above the class<\/span> definition.<\/p>\n

As far as I’ve read, not necessarily every country has a locale<\/span> in Java. You can see which ones do here<\/a>.<\/p>\n

HTH:)<\/p>\n

Other sources:<\/em><\/p>\n

docs.oracle.com<\/a><\/p>\n

stackoverflow.com<\/a><\/p>\n

Jack of Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.<\/p>\n","protected":false},"excerpt":{"rendered":"

The tutor continues about number formatting with Java. We don’t live in countries any more; rather,\u00a0 we live in the world.\u00a0 Right now, for instance, my family is off in the US.\u00a0 I’m not with them; I stayed home to …<\/p>\n

Java number formatting: Locale<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[642,651,647,652,653,602],"class_list":["post-9382","post","type-post","status-publish","format-standard","hentry","category-computer-science","tag-java-decimalformat","tag-java-international-number-format","tag-java-number-format","tag-java-numberformat","tag-java-numberformat-locale","tag-java-programming"],"_links":{"self":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/9382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/comments?post=9382"}],"version-history":[{"count":39,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/9382\/revisions"}],"predecessor-version":[{"id":9421,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/9382\/revisions\/9421"}],"wp:attachment":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/media?parent=9382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/categories?post=9382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/tags?post=9382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}