What are some examples of mutable data types in Java?

What are some examples of mutable data types in Java?

In Java, examples of mutable data types include StringBuilder, ArrayList, and HashMap. They can be modified after creation.

Can you explain why StringBuilder is mutable?

StringBuilder is mutable because it allows you to change its content without creating a new object. You can append, insert, or delete characters.

What about ArrayList? How does it handle mutability?

ArrayList is mutable as it allows you to add, remove, or change elements dynamically. The size can also change as elements are added or removed.

Are there any performance benefits to using mutable types?

Yes, mutable types can be more efficient in terms of memory and performance, especially when frequent modifications are needed.