With Apache Commons Lang 3.5 and above: NumberUtils.isCreatable or StringUtils.isNumeric. With Apache Commons Lang 3.4 and below: NumberUtils.isNumber or StringUtils.isNumeric. You can also use StringUtils.isNumericSpace which returns true for empty strings and ignores internal spaces in the string. Another way is to use NumberUtils.isParsable which basically checks the number is parsable according to Java. (The … Read more
I am making an Android app using Toolbar with Custom style but when i’m running the app, i’m getting the following error: Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. Styles.xml … Read more
You should check your field before parse double:
I have these two variables Then I did this expression but I end up with 27.0. In fact I have many other variables and when I use them in the expression I always get a 0 in the tenth’s place.
You should actually take the result from the option pane: Otherwise, it remains set to JOptionPane.YES_NO_OPTION. Cleaner would be: Although, I’m not sure what this line is expected to do in the posted code: remove(dialogButton);. For more details and examples check out How to Make Dialogs tutorial.
From your description I assume you are on windows machine and your home is abc So Now : Cause When you run this command keytool -genkey -alias tomcat -keyalg RSA because you are not specifying an explicit keystore it will try to generate (and in your case as you are getting exception so to update) … Read more
Compression algorithms almost always have some form of space overhead, which means that they are only effective when compressing data which is sufficiently large that the overhead is smaller than the amount of saved space. Compressing a string which is only 20 characters long is not too easy, and it is not always possible. If … Read more
You almost got it. There are some errors though: you’re not iterating over all the chars of the password (i < password.length() – 1 is wrong) you start with a digit count of 1 instead of 0 you make the check that the count of digits is at least 2 as soon as you meet … Read more
What is meant by this error: Error: Main method not found in class Static.A, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application I was trying to run a program Without main Method..
You keep updating both high and low inside the run() method, making them by definition not effectively final. Since you don’t need them outside the run() method anyway, just move the two lines inside.