When you write String::toUpperCase, Java binds each element of the stream (String object) to the toUpperCase() method. This means String::toUpperCase is interpreted as s -> s.toUpperCase() , where ...

How to format a Date in Java with printf?. The best way to output date and time values in Java is with the DateTimeFormatter class. But the printf method supports simple date formatting through the ...

In the above example of Java’s String length method, the output for the size of the String is 25. The String length method includes the whitespace padding at the beginning and the end of the String.