How to check alphanumeric in Java refers to the process of determining whether a given string contains only alphanumeric characters (i.e., letters and numbers). This is a common requirement in programming, as it can be used to validate user input, ensure data integrity, and perform various string manipulation tasks.
There are several ways to check if a string is alphanumeric in Java. One approach is to use the matches() method of the String class, which allows you to specify a regular expression to match against the string. For example, the following code checks if a string contains only alphanumeric characters:
