In general, a string is nothing but a sequence of characters identified by double quote(" ").

In java,Programming each string is an object.

Java supports 4-inbuilt classes specifically used to represent and manipulate strings like:
String, StringBuffer, StringBuilder, StringTokenizer.

String Class:

String is an inbuilt class present in java.lang package, specifically used to represent and manipulate strings.
In this context there are two approaches two represent strings which are as followed:

(Approach 1):

• String s1= “java”;
• String s2= “race”;
• String s3= “java”;

(SCP ---  STRING  CONSTANT  POOL)   

(Approach 2):

• String s1= new string(“java”);
• String s2= new string (“race”);
• String s3= new string(“java”);

• Here, each strings are immutable ( non- changeable behaviour).

Example:

String  s1 = “java”;                   
System.out.println(s1.concat(“race”));

Output:  javarace