In Java 12 the transform method was add to the String class. This method accepts a Function as argument. The function must have a single parameter of type String and can return any other type. The nice thing is that it works on a String instance, so we can directly use the transform method when we have a String value. We don’t have to pass the String object to another method to tranform it, but we can define the tranformation function close to the String value.

In the following example we take a String value and apply some functions with the transform method:

This week at work a colleague showed a nice feature of the Pattern class in Java: we can easily turn a Pattern into a Predicate with the asPredicate and asMatchPredicate methods. The asPredicate method return a predicate for testing if the pattern can be found given string. And the asMatchPredicate return a predicate for testing if the pattern matches a given string.

In the following example code we use both methods to create predicates: