I’ve read somewhere that in Java scheduler, thread switching happens after execution of certain amount of instructions and not after a certain time (like schedulers used in operating systems). But the references were missing. I wanted to know if this is correct. Answer Java used to have a feature called…
Tag: java
Count total subsequences whose sum is divisible by k
I am trying to write a DP solution for the problem: count total number of sub-sequences possible of an array whose elements’ sum is divisible by k. I have written the following solution. But it is not giving the correct result. Like in the following code snippet, the array is {1, 2, 1} and k = 3. So exp…
Connect 4 check for a win algorithm
I know there is a lot of of questions regarding connect 4 check for a win. The issue is that most of other algorithms make my program have runtime errors, because they try to access an index outside of my array. My algorithm is like this: count is the variable that checks for a win if count is equal or
java.lang.Long cannot be cast to java.lang.Double
I have a method which takes object as an input and if the input is instanceOF Long then converting the value to double value. Below is the code : but when I am executing the above code I am getting below exception : Kindly let me know why its giving me exception. But if directly try to cast Long object
Using SFTP in Java, How do I transfer a file from one folder to another? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 7 years ago. The community reviewed whether to reopen this question 5 months ago and left it closed: Not suit…
Convert Element(org.w3c.dom) to String in Java
I’m having a small issue of converting Element object to String. Because I need a string to be passed to a particular method. I’ve tried by using .toString() or using a String variable assigning to it. None of the trials were correct. How can we easily convert and the string object also should sho…
java.lang.IllegalArgumentException: Parameter ‘directory’ is not a directory
I am trying to deploy a maven web application on my local wildfly machine. But I am getting this error: Answer It seems that at deploy time, the application is looking for a directory which has not been generated at package time thus the problem. When created in the target/lib then the deployment runs ok.
Java .split(“|”) not working
I just ran into the problem that the split method for strings wouldn’t work with character “|” as an argument. It somehow separates each character in the string. Code: Output: Answer Use escape character before | like below: Similar “escape character logic” is required, when you …
JSP doesn’t see CSS and JS files from resources folder
I have some problem with my css and js import in my web application. I am using Servlets/JSP/CSS/JS. I am sorry for this question, i saw many questions and answers for this theme and situation but nothing helped me. I am trying to add css and js files like this: But something happends and all of my css and js
Several Errors being Logged for File I/O code
Here is my code from learning the File i/o… Whenever I try to open the ABC1.txt file from the workspace folder (In C:), it shows the size of 12.00 MB and whenever I refresh the folder the size also gets increased each time . And another thing I want to mention is, I m not able to see the File