Question

Need some help with some Java studying. Please be as detailed as possible with the answer.

- Explain the difference between a mutable and an immutable string, why it’s usually more efficient to use a mutable string, and why using an immutable string make programs safer and more robust.

- Explain how Java determines the initial capacity of a StringBuilder object and the new capacity of a StringBuilder object when its current capacity is exceeded.

Answer 1

Strings are immutable in java which means once you create the String object for that you can not change the value of that object, if you try to change the value in the object instead of chaning it will create new object with changes and returns the new object. mutable means we can change the values in the Object ex:StringBuffer and Builder

Program is efficient if we use mutable strings because if we change than it will not create new objects so it saves lot of memory

It is secure to use Strings becuase if one object is modified the content than it will get impacted to other objects as well becuase of String pool

By default StringBuilder creates with the size 16 than if capacity exceeds than it will increase like (oldSize+1) * 2