Java Currency Number format

I doubt it. The problem is that 100 is never 100 if it’s a float, it’s normally 99.9999999999 or 100.0000001 or something like that. If you do want to format it that way, you have to define an epsilon, that is, a maximum distance from an integer number, and use integer formatting if the difference … Read more

Working Soap client example

To implement simple SOAP clients in Java, you can use the SAAJ framework (it is shipped with JSE 1.6 and above, but removed again in Java 11): SOAP with Attachments API for Java (SAAJ) is mainly used for dealing directly with SOAP Request/Response messages which happens behind the scenes in any Web Service API. It allows … Read more

IDEA: javac: source release 1.7 requires target release 1.7

Most likely you have incorrect compiler options imported from Maven here: Also check project and module bytecode (target) version settings outlined on the screenshot. Other places where the source language level is configured: Project Structure | Project Project Structure | Modules (check every module) | Sources Maven default language level is 1.5 (5.0), you will see this version as the Module language level … Read more

Why is my method undefined for the type object?

Change your main to: When you declare Object EchoServer0; you have a few mistakes. EchoServer0 is of type Object, therefore it doesn’t have the method listen(). You will also need to create an instance of it with new. Another problem, this is only regarding naming conventions, you should call your variables starting by lower case letters, echoServer0 instead … Read more

org.xml.sax.SAXParseException: Content is not allowed in prolog

This is often caused by a white space before the XML declaration, but it could be any text, like a dash or any character. I say often caused by white space because people assume white space is always ignorable, but that’s not the case here. Another thing that often happens is a UTF-8 BOM (byte order mark), which is allowed … Read more

How to get the last value of an ArrayList

The following is part of the List interface (which ArrayList implements): E is the element type. If the list is empty, get throws an IndexOutOfBoundsException. You can find the whole API documentation here.

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