Question

A primary difference between an object created from the String class and an object created from the StringBuilder class is that a StringBuilder object is

a. immutable
b. mutable
c. a reference type
d. a value type

Answer 1

A StringBuilder object is mutable, meaning it can be modified after creation, while a String object is immutable and cannot be changed.

Step-by-step explanation:

The primary difference between an object created from the String class and an object created from the StringBuilder class is that a StringBuilder object is mutable. This means that you can modify the content of a StringBuilder object once it is created, whereas a String object is immutable and cannot be changed.

For example, if you have a StringBuilder object with the content 'Hello', you can use methods like append or insert to modify it, such as adding more characters or replacing existing characters. On the other hand, if you have a String object with the content 'Hello', you cannot directly modify it - you would need to create a new String object with the desired changes.

Therefore, the correct answer is b. mutable.