Java Strings

Introduction to Java String

Java String is a sequence of characters that exist as an object of the class java.lang. Strings are created and manipulated by class and string has immutable nature. Java string helps in processing the textural data with ease. Search, Creating Substrings and creating new strings are three in-built features of Java string.

Java.Lang.String
Java.Lang.The string is a class in Java and since it is the final class so it cannot be inherited. It implements three interfaces; ‘Serializable’, ‘Comparable’ and ‘CharSequence’.

• SERIALIZABLE
Serializable doesn’t contain any data member or method because it is a ‘Marker Interface’. A marker interface is used to mark the java classes in order to get the specific capability for the objects of its classes.

• COMPARABLE
Comparable interface is found in Java.Lang.Package. This interface is used for ordering the objects of any user-defined class. Comparable contains only one method and that is compareTo (Object).

• CHARSEQUENCE
CharSequence is a readable interface that reads the character and provides uniform and read-only access to various types of character sequences.

How strings are created?

Strings are created in an area which is known as ‘String Pool’. It is basically a collection of strings which is stored in heap memory. The string pool has a role to play because the string has an immutable nature. The reason for using the string pool is that it helps the Java runtime in saving the space.

Creation of a String

The string is created in two ways one is ‘Literal’ (Intern) and the second one is ‘New Keyword’ (Object).

1. Creating a string using ‘Literal’. In a literal manner, the string is created by using double-quotes. If you want to create a new string look for a string that has some value in the string pool. If the same value is found then it will return back the reference or else will create a new string in the pool and will return the reference.

2. Creating a string using ‘New Keyword’- Whenever a string object is created using a ‘New’ keyword it will automatically create a new object in heap memory.

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