I am having problems testing my app. I created an espresso test which is supposed to fail, since whenever I launch my app in the emulator, I get the expected behavior. There is my test: When launching the test, nothing is reported, whereas nextQuestionButton should not be enabled upon clicking the radioButton…
Jackson Not Overriding Getter with @JsonProperty
JsonProperty isn’t overriding the default name jackson gets from the getter. If I serialize the class below with ObjectMapper and jackson I get As you can see the JsonProperty annotation has no effect Putting @JsonProperty on the String itself doesn’t work either. The only way it seems that I can …
Convert double to float in Java
I am facing an issue related to converting double to float. Actually, I store a float type, 23423424666767, in a database, but when we get data from the database in the below code, getInfoValueNumeric(), it’s of double type. The value we get is in the 2.3423424666767E13 form. So how do we get a float fo…
Lombok @Builder not initializing collections
I am using Lombok’s @Data and @Builder annotations like this: When I create a new Movie using the builder, without specifying any actors, I would expect Lombok to initialize my List to Collections.emptyList(). But this does not happen: In the documentation for the @Builder annotation, it is stated at li…
Java Scheduler Thread Switching
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…
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…