WHAT IS STRING POOL IN JAVA

Mayank Tripathi

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Posted by  Mayank Tripathi
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  1. Mayank Tripathi

    Post:807

    Points:4035
    What is string pool in java

    String Pool is a pool of strings stored in Java heap memory. String objects can be created either by new operator or by specifying the values in double quotes.

    Method 1:
     When a new string is created using double quotes, JVM searches string pool for the string with the same value. if it finds a string which matches the values, it will return the reference of the string. Else it will create a new string in the pool and returns that reference.
    String s1 = "Cat"; 
    String s2 = "Cat"; 
    if(s1 == s2) System.out.println("equal"); //Prints equal.

    Method 2:
    When new operator is used to create a string, String class will be forced to create a new String object. To put the newly created string into the pool or assign it to another string, use intern(). 
    String n1 = new String("ABCD"); 
    String n2 = new String("ABCD"); 
    if(n1 == n2) System.out.println("equal"); //No output.

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