I have a while loop and I want it to exit after some time has elapsed. For example: Answer Thus the statement Checks if it has been 10 seconds or 10,000 milliseconds since the loop started. EDIT As @Julien pointed out, this may fail if your code block inside the while loop takes a lot of time.Thus using Execu…
Open CSV to export resultset to string type
I want to export the result set of the SQL query to a CSV file. I am using opencsv to export to CSV file. I am using below code to achieve it. But the problem I face is, it automatically exports to the datatype of the database column which is from resultset. Example: if I a column with datatype as
Is repeatedly instantiating an anonymous class wasteful?
I had a remark about a piece of code in the style of: Iterable upperCaseNames = Iterables.transform( lowerCaseNames, new Function() { public String …
Java – Counting numbers in array
I’ve written a java prog that stores some values: which generate such output: 0:2 1:3 2:4 3:5 4:4 5:4 6:3 and now I need to count numbers in this output #1. Output #2 should be this: 1: 0 2: 1 3: 2 4: 3 5: 1 It means it counts ONE 2, TWO 3, THREE 4, and only One 5.
Alternating between even and odd elements in Array with GUI
I’m trying to work with more GUI stuff but I’m having problem with something. I have an array of JLabels. Each of them contain 1 number from 0 to 7. I’m making the numbers “light up” by changing …
Test Coverage: How to cover assertions?
EDIT: So It looks like JeffStorey link to the bug is correct. With assertions enabled the compiler will generate extra code. There ends up being 1 extra unreachable branch created. One of my methods constructor has these asserts I’m trying to cover it by doing this And again with values Board (-4 , 2) a…
How to pass an object from front-end to Struts 2
I am trying to send value of a field to Struts2 back-end through JavaScript but it returns NullpointerException. Once form is submitted the request will be sent to the following JavaScript method to be sent to back-end. the request will be created and sent as following But in back-end when I try to show the v…
Working with various Calendar TimeZone in Java (without using Joda Time)
I was looking for a way to get current time in various timezones based on an user input. I know I could use Joda Time! but is that the only way? Isn’t there an option in Java for doing this? I tried the following code which gives the same output for all 3 sysouts. What am I missing here to
Convert minutes into a human readable format
quick question. Is there a smarter/sleeker way to convert minutes into a more readable format, showing only the most significant digit? I’m using Android Studio’s Java. ie My code is very cumbersome, sloppy, and somewhat unreadable. Many thanks, J Answer Well it is possible, I figure it out and I …
Failed to load Main-Class manifest attribute while running java -jar
I have successfully built my Spring MVC project with mvn clean package by following this tutorial. Now I am trying to run the service with: But I get this error: Failed to load Main-Class manifest attribute from target/gs-serving-web-content-0.1.0.jar Am I missing something? Answer If you are working with Spr…