How can I convert a .jar to an .exe?

Launch4j works on both Windows and Linux/Mac. But if you’re running Linux/Mac, there is a way to embed your jar into a shell script that performs the autolaunch for you, so you have only one runnable file: exestub.sh: Then you create your runnable file from your jar: It works the same way launch4j works: because a … Read more

Why I am getting java.lang.AbstractMethodError errors?

The simple answer is this: some code is trying to call a method which is declared abstract. Abstract methods have no body and cannot be executed. Since you have provided so little information I can’t really elaborate more on how this can happen since the compiler usually catches this problem – as described here, this means the … Read more

what is the difference between `public class` and just `class`?

public, protected and private are access modifiers. Public means that the subject may be accessed by any class, protected by subclass, private by the class itself, no modifier means “package protected”, so the subject may be accessed by classes from the same package. Subject is class, method, member variable.

Returning Arrays in Java

It is returning the array, but all returning something (including an Array) does is just what it sounds like: returns the value. In your case, you are getting the value of numbers(), which happens to be an array (it could be anything and you would still have this issue), and just letting it sit there. When … Read more

How to replace ” \ ” with ” \\ ” in java

Don’t use String.replaceAll in this case – that’s specified in terms of regular expressions, which means you’d need even more escaping. This should be fine: Note that the backslashes are doubled due to being in Java string literals – so the actual strings involved here are “single backslash” and “double backslash” – not double and quadruple. replace works on simple … Read more

How to update a value, given a key in a hashmap?

should be fine. It will update the value for the existing mapping. Note that this uses auto-boxing. With the help of map.get(key) we get the value of corresponding key, then you can update with your requirement. Here I am updating to increment value by 1.

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