JDK Code Reading - String

Introduction

String class is used to represents character strings in Java. The strings of this class are immutable once they are created.

Immutablness

Programcreek gives 5 reasons for immutablesness of String in Java.

1. A immuatble object in object pool can be reused to avoid overhead of creating a new object.
2. The hashcode of a String object can be cached to avoid the overhead caused by computing hashcode.
3. Facilitating the use of other objects
4. Security, prevent other’s modification
5. Thread-safe

Internally, String class store the data in a char array.

private final char value[];

REFERENCE

1. Why String is immutable in Java?