I want my program to create a file for the user (just for the first time) and write some information to it (it’s not just a line and also can be adjusted anytime later). So I did this: It works but there some problems: When the file gets opened later, as default, the File class removes its contents. When the
Smali – lots of “move-object”
I’m using mt manager to edit Smali in dex. I found that there are many move-object in some classes, most of them are unnecessary. Does it impact performance? Answer Does it impact performance? No. The optimizer should eliminate any unnecessary moves when the smali code1 is compiled to native code. For what it is worth, this is similar to the
What happens at runtime when we have multiple Java threads?
I am trying to understand what happens when you have multiple thread objects and you call start on them. To this end, I have written the following code: So the output I get involves Thread-x, where x is from 0 to 99, but they are in different order than the natural order (i.e. 0,1,2,3,…). I expected this because I read
VSCode Maven “X.java is not on the classpath of project Y”
Currently I have an issue with Maven is Visual Studio Code where it reports errors related to the classpath. The project structure is as following: And the pom.xml of project has: This POM only serves as ‘dummy’ in order to compile each sub project And in the pom.xml of each subproject has the following: When going to any Java source
Can’t implement string output
It is not possible to display the string correctly by condition If the coffee machine has enough supplies to make the specified amount of coffee, the program should print “Yes, I can make that amount of coffee”. If the coffee machine can make more than that, the program should output “Yes, I can make that amount of coffee (and even
password validation regex java
i have used regex for password validation. i am using servlet for this validation but there is some issue arising. this method isnt working. it returns all the errors even if some conditions are satisfied. help! if anything else reqd i will add it just ask. input – expected output – actual output – Answer Your pattern are incomplete. Add
How get all results from github search api?
I need to get all results with github search api with pagination using. Now I use request: https://api.github.com/search/repositories?q=lib&page=1&per_page=20 I read that the responses also includes the Link header which contains a ready-made URL to the next page. In response I have link https://api.github.com/search/repositories?q=lib&page=2&per_page=20> and link to the last page: https://api.github.com/search/repositories?q=java&page=50&per_page=20 But I don’t understand how can I to implement transition
Testing a Spring ControllerMethod using Mockito which alters an entry in the db with Optional.map NullPOinterException
Im currently Testing my Controller methods. In one Method I add a Reisepunkt(travelpoint) to a Reise(travel), which is already saved inside a database. Using the generated-request.http API I can use the method to make entrys into the db. Now i wanted to write a test method just so I can get the hang of it. I always get a NullPointerException
ClassNotFoundException thrown
I have an issue with my program for a project assignment throwing multiple ClassNotFoundException. I think the problem stems from the BaseGear class, which is the abstract super class for all items in the game. Each item must be restricted by class so in the constructor the string restrict is provided as an argument which I then try and convert
IndexOutOfBoundException when i pass arraylist to DBHelper to update database (Android SQlite)
I am new at android and trying to make managing members app with database. what i want to do here is that when user buys any drink it should change drinks name to “bought” in database, but when i pass Arraylist to db class it shows that my Arraylist is empty. userInputActivity here user selects drink he/she wants and when