About strings in Java

Strings are an incredibly common type of data in computers.
A Java string is a series of characters gathered together, like the word "Hello", or the phrase "practice makes perfect". Create a string in the code by writing its chars out between double quotes.

Java String Class is immutable, i.e. Strings in java, once created and initialized, cannot be changed on thesame reference. A java.lang.String class is final which implies no class and extend it. The java.lang.String class differs from other classes, one difference being that the String objects can be used with the += and + operators for concatenation.

Two useful methods for String objects are equals( ) and substring( ). The equals( ) method is used for testing whether two Strings contain the same value. The substring( ) method is used to obtain a selected portion of a String.

String Class:

• The String class is immutable.
• The contents of the String object can not be changed.
• String class is final class. That implies it can not have sub classes.
• String objects can be concatenated by using + and += operators