Java String Class Methods The java.lang.String class provides a lot of built-in methods that are used to manipulate string in Java. By the help of these methods, we can perform operations on String ...

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase(java.util.Locale)' on a null object reference #7772 New issue Copy link ...

At this point, the Scanner still returns a String, although the String contains only one character. To complete the use case, you must convert this one-character String into a single Java char with ...