We have a Swing app that processes relatively large amounts of data. For instance we currently process CSV files with millions of rows of data. For the reasons of performance and simplicity we just keep all of the data in memory. However different users will have different amounts of data they need to process…
Tag: java
Java’s enum… Where are they created?
Since enum in C# are on the stack, I was wondering where enum, in Java, where created. On the stack? On the heap? In some mysterious other place? Enumeration in C# are more primitive than those in Java, this might explain why they are created on the stack… Where are they? I can’t find them! Thanks…
Circular dependency in Java constructors
I have the following classes. and As can be clearly seen, there is a circular dependency between the classes. if I try to run class A, I eventually get a StackOverflowError. If a dependency graph is created, where nodes are classes, then this dependency can be easily identified (at least for graphs with few n…
Switch between a TextView and EditText
Is this possible to interchange a TextView and an EditText. Like display the text when needed, but allow editing when needed. Is there a method (as in NON-XML) way of editing a TextView or non-editing a EditText? Answer Is this possible to interchange a TextView and an EditText. Put both in your layout in the…
How to create a directory in Java?
How do I create Directory/folder? Once I have tested System.getProperty(“user.home”); I have to create a directory (directory name “new folder” ) if and only if new folder does not exist. Answer After ~7 year, I will update it to better approach which is suggested by Bozho.
Can java run a compiled scala code?
Can command java run a compiled scala code? If so, why do we have an exclusive command scala?
@override annotation in JDK 1.6
I’m using JDK1.6. When I implement an interface and in the implementing class, if I give @override before my function names, Eclipse throws an compilation error. i.e. below code is wrong according to Eclipse. If I remove @Override annotation, then the code compiles fine. Does it mean that JDK1.6 does no…
SAP Java stack architectural differences from ABAP stack?
My company is thinking to upgrade SAP from 46C to ECC 6.0 EHP 5 and we have the next 3 questions: 1) What is the difference between ABAP Stack and Java Stack. I imagine 46C is “ABAP stack”? 2) In which cases it is absolutely necessary to install the Java Stack? 3) Does the installation of the EHPs…
View’s getWidth() and getHeight() returns 0
I am creating all of the elements in my android project dynamically. I am trying to get the width and height of a button so that I can rotate that button around. I am just trying to learn how to work with the android language. However, it returns 0. I did some research and I saw that it needs to
Preferred Java way to ping an HTTP URL for availability
I need a monitor class that regularly checks whether a given HTTP URL is available. I can take care of the “regularly” part using the Spring TaskExecutor abstraction, so that’s not the topic here. The question is: What is the preferred way to ping a URL in java? Here is my current code as a …