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Which of the following is a mutable class in java?

a) java.lang.String

b) java.lang.Byte

c) java.lang.Short

d) java.lang.StringBuilder

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(d) java.lang.StringBuilder

Reason: A mutable class is a class in which changes can be made after its creation. We can modify the internal state and fields of a mutable class. The StringBuilder class is a mutable class, as it can be altered after it is created.

The String, Byte, and Short are immutable classes as they cannot be altered once they are created.

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