String is Immutable - String Vs String builder

String is immutable

• String a=”a”; address is 12345
• a=”b”; address will be 3456
• String a=new String(“a”);
• Will create one object in String pool and create one more object for new operator will get created and that will point to it.
• String a=”a”; will create object in string pool and object a will point to it.

StringBuffer is mutable

•  StringBuffer b=”a”; address is 12345
•  b=”b”; address is 12345
•  This is synchronized

StringBuilder : This is similar to StringBuffer but this is not synchronized

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