Here is a utility method to check if a given String is a valid Social Security number using Java Regular Expression.
Here is another method from my String utility class. This method uses a regular expression to check if a String is a numeric value. Look at the code, then read through the explanation that follows
Launch Eclipse Click on Recent Workspaces Eclipse will list all previously used workspaces Right click on the workspace name that you want to remove Click on Remove from Launcher Selection text. This will remove the workspace from the drop-down list
Following code is an example of generating a random alpha-numeric string using Java Random class. It is designed to generate random String of varying length based on the input parameter.
Scanner is a utility class that provides methods to read command-line input. It is a very useful class, but you need to be aware of its unexpected behavior while reading numeric inputs. Consider following example.
One of the most common bugs I’ve seen in Java programs in the use of == operator to compare two String objects. Most of the times the result may be accurate but it is not always guaranteed. We need to understand the difference between == and the Object.equals method.
I’ve written about Java regular expression to validate email addresses before. Today I am sharing another Java regex to validate Gmail address. It is quite simple and self-explanatory.
Following simple Java program shows how to read input values and then print smallest and largest values. It reads the input from standard input using Scanner and then uses methods from Math class to determine the largest and smallest numbers entered by the user.
Although Java’s Arrays class has a built-in method to sort an array, it is important for good Java developers to know how to sort an array on their own. Bubble sort is the simplest sorting algorithm.
Here is a list of 10 commonly used Eclipse shortcuts for Java developers. Ctrl + Shift + T: Open a type (e.g.; a class, an interface) without browsing through list of packages Ctrl + Shift + R: Open any file quickly without browsing for it in the Package Explorer Ctrl + O: Go directly to …