I’m trying to place my KeyListener in a new Thread called Keys in my project because my main thread is already in a loop. So I want this method to return a boolean if the key is pressed or not. I’m pretty new to Java so sorry if that is just a dumb mistake. Thread: I would appreciate an example.
Knight’s Tour random move picker not working
I am working on randomizing which move my knight takes in my knight’s tour code. For some reason though, my switch statement always goes to default, instead of executing a possible move. I know my possible moves methods work because I have separately ran firstMoveChoice() on it’s own and it worked…
Lazy way to convert log4j.xml to log4j2.xml [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 2 years ago. Improve this ques…
Returning ResultSet without close?
I would like to have a database connection managing class which I can use for simple SQL commands like SELECT, INSERT etc. by simple calling something like this (class below): This is class I’ve found on web: Is this way of returning ResultSet without closing it (and closing the statement) right? How ca…
Java – Why can’t I use charAt() to see if a char equals another?
I want to see if a character in my string equals a certain other char value but I do not know what the char in the string is so I have used this: But I get the error: But “g” == “h” seems to work and I know you can use ‘==’ with char types. Is there another way to
What’s the difference between map() and flatMap() methods in Java 8?
In Java 8, what’s the difference between Stream.map() and Stream.flatMap() methods? Answer Both map and flatMap can be applied to a Stream<T> and they both return a Stream<R>. The difference is that the map operation produces one output value for each input value, whereas the flatMap operati…
How to check a Long for null in java
How do I check a Long value for null in Java? Will this work? Answer Primitive data types cannot be null. Only Object data types can be null. There are 8 primitive types in Java: Data Type Size Description byte 1 byte Int8 short 2 bytes Int16 int 4 bytes Int32 long 8 bytes Int64 float 4 bytes Single double
How to install Tomcat in Amazon Web Services EC2
I have created an instance in Amazon web services, and I have connected to the server using putty through ssh. But I do not know how to install tomcat 8 in amazon ec2. Please help me with this. Answer You can use yum tool to install the tomcat8 packer from amazon default repository. The command is: yum instal…
java.sql.SQLException: An attempt by a client to checkout a Connection has timed out
I have a java client server which is supposed to establish connection pool on startup but its failing on timeout error. There are so many threads on this same issue but none of the solutions worked for me AM using jdk 7 and below is the mchange maven dependency jdbc.properties Here is my DAO class which estab…
How to load JSON Schema file from java
My Project is a maven project and inside resources folder – src/main/resources folder I have a json schema file – “jsonschema.json ” package : src/main/resources file : jsonschema.json Now i want to validate my jsonobject with json schema How to load the schema.json file in to the code…