I have an array of colours of size n. In my program, the number of teams is always <= n, and I need to assign each team a unique color. This is my color array: When I print information about the players in the console, I want to print what color is associated with them. When I print the color,
Tag: java
Unable to find valid certification path to requested target – error even after cert imported
I have a Java client trying to access a server with a self-signed certificate. When I try to Post to the server, I get the following error: unable to find valid certification path to requested target Having done some research on the issue, I then did the following. Saved my servers domain name as a root.cer f…
Spring value injection in mockito
I’m trying to write test class for the following method I’m using the injected url value in one of the methods in the class. To test this i’ve written a junit class In applicationContext-test.xml I’m loading the property file using But the url value is not getting loaded in the CustomS…
convert zip byte[] to unzip byte[]
I have byte[] of zip file. I have to unzip it without creating new file, and get byte[] of that unzip file. Please help me to do that Answer You can use ZipInputStream and ZipOutputStream (in the package java.util.zip) to read and write from ZIP files. If you have the data in a byte array, you can let these r…
Apache Commons Text StringEscapeUtils vs JSoup for XSS prevention?
I want to clean user input for help preventing XSS attacks and we don’t necessarily care to have a HTML whitelist, as our users shouldn’t need to post any HTML / CSS. Eyeing the alternatives out there, which would be better? [Apache Commons Text’s StringEscapeUtils] [1] or [JSoup Cleaner][2]…
How to run java code in a restricted sandbox (without network, filesystem access)
Say some programmer gives me an executable jar (from Java code) along with the entry point to use. I want to run this jar (programmatically) from Java code in a restricted sandbox environment with no …
Is it bad practice to separate sections of code inside one method with curly brackets? [closed]
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 1 year ago. Improve this question I tend put multiple lines of code that fullfill a certain task into bl…
how can you programmatically set the JSplitPane to hide the right/bottom component when OneTouchExpandable is set to true?
In a JSplitPane, you have the setOneTouchExpandable method which provides you with 2 buttons to quickly fully hide or full show the JSplitPane. My question is how can you programmatically “click” the hide button on the JSplitPane? I may have wrongly explained myself. I want the splitpane to show o…
difference between natural ordering and total ordering
I happen to come across many statements like comparable is used when natural ordering is required while sorting an array or collection and comparator for total ordering. The version you may have heard could be same or different with the same meaning but ultimately its one of the distinguishing factors between…
What are good light-weight design patterns for avoid nulls in Java?
Obviously one of the greatest banes of Java programming is nulls and null-pointer exception. What design patterns are there that don’t add too much to your code but reduce the problem of sand null-pointer exceptions? Answer Null Object pattern. Look at Optional class from google-guava library. Their wik…