How do I save a String to a text file using Java?

If you’re simply outputting text, rather than any binary data, the following will work: Then, write your String to it, just like you would to any output stream: You’ll need exception handling, as ever. Be sure to call out.close() when you’ve finished writing. If you are using Java 7 or later, you can use the “try-with-resources statement” … Read more

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

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 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.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)