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The String class represents character strings. All string literals in Java
programs, such as “abc”, are implemented as instances of this class. Strings are
constant; their values cannot be changed after they are created. String buffers
support mutable strings. Because String objects are immutable they can be
shared.

For example:

     String str = "abc";

 is equivalent to:

     char data[] = {'a', 'b', 'c'};
     String str = new String(data);

 Here are some more examples of how strings can be used:

     System.out.println("abc");
     String cde = "cde";
     System.out.println("abc" + cde);
     String c = "abc".substring(2,3);
     String d = cde.substring(1, 2);