What is string pool in java

Anonymous User 1824 10 Jul 2015

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Updated 23 Sep 2020

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Anonymous User 10 Jul 2015

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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