If this is a linux vserver or root server, you can use the “screen” tool to access the minecraft console again. Create a new startup script (start.sh) in the server directory to launch the JAR: #!/bin/sh screen -d -m -S “minecraft_screen” java -Xmx1024M -Xms1024M -jar minecraft_server.1.15.2.jar nogui Open your terminal and execute the following in … Read more
(Is it because this is Java and therefore I shouldn’t be doing evil nonportable obsolete things like touching my environment?) I think you’ve hit the nail on the head. A possible way to ease the burden would be to factor out a method and pass any ProcessBuilders through it before starting them. Also, you probably already … Read more
There is a concurrent list implementation in java.util.concurrent. CopyOnWriteArrayList in particular.
You compiled your jar with a JDK version superior to the JDK used to launch the jar file (you might have compiled with 1.7 and try to run it with 1.6). 2 solutions: If you don’t use specific features of the JDK you use to compile, set its target to the previous version (in the … Read more
If you check the API for List you’ll notice it says: Being an interface means it cannot be instantiated (no new List() is possible). If you check that link, you’ll find some classes that implement List: All Known Implementing Classes: AbstractList, AbstractSequentialList, ArrayList, AttributeList, CopyOnWriteArrayList, LinkedList, RoleList, RoleUnresolvedList, Stack, Vector Some of those can be instantiated (the ones that are not defined as abstract class). Use their links to know more about them, I.E: to … Read more
When is while(true) true, and when is it false? It’s always true, it’s never false. Some people use while(true) loops and then use break to exit them when a certain condition is true, but it’s generally quite sloppy practice and not recommended. Without the use of break, return, System.exit(), or some other such mechanism, it will keep looping forever.
String.EMPTY is 12 characters, and “” is two, and they would both be referencing exactly the same instance in memory at runtime. I’m not entirely sure why String.EMPTY would save on compile time, in fact I think it would be the latter. Especially considering Strings are immutable, it’s not like you can first get an empty String, and perform some operations … Read more
In Java args contains the supplied command-line arguments as an array of String objects. In other words, if you run your program as java MyProgram one two then args will contain [“one”, “two”]. If you wanted to output the contents of args, you can just loop through them like this…
Apache Commons Lang has a Range class for doing arbitrary ranges. Guava Range has similar API. If you are just wanting to check if a number fits into a long value or an int value, you could try using it through BigDecimal. There are methods for longValueExact and intValueExact that throw exceptions if the value is too big for those precisions.
Technically speaking, there’s no such thing as a null array; but since arrays are objects, array types are reference types (that is: array variables just hold references to arrays), and this means that an array variable can be null rather than actually pointing to an array: An empty array is an array of length zero; it has no elements: (and can never have elements, … Read more