String class:

• The “String” class provides a number of methods that examines for a string inside of a string.
• The term “substring” refers to a string that denotes another string’s part.
• The “startsWith” method would determine whether calling string of object begins with a particular substring.
  • The method returns “true” if string begins with specified substring, it returns “false” otherwise.
• The “endsWith” method would determine whether calling string would end with a specified substring.
  • The method returns “true” if string ends with specified substring, it returns “false” otherwise.
• The “regionMatches” method would determine whether specified regions for two strings match.
  • The first argument of this method can be “true” or “false” that indicates whether a case-insensitive comparison could be performed.

concat method:

• It returns a copy of calling string object with contents of given string concatenated to it.
• It performs same operation as “+” operator while used with strings.
• It returns a string with value of string passed into method, appended to end of string.
• It appends one string to another string’s end.