String objects

• Java provides a String class to deal with sequences of characters.

  String username = "Fred Flinstone";
  

• The String class provides a variety of methods to operate on String objects.
• The equals() method is used to compare Strings.
• The length() method returns the number of characters in the String.
• The + operator is used for String concatenation.
• String objects are read-only (also called immutable).
• In the example below, the second assignment gives a new value to the object reference str, not to the contents of the string:

  str = "Fred";
  str = "Barney"
  

• An array of char is not a String.