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Q121. What is the purpose of the System class?
The purpose of the System class is to provide access to system resources.

Q122. Which TextComponent method is used to set a TextComponent to the read-only state?

Q123. How are the elements of a CardLayout organized?
The elements of a CardLayout are stacked, one on top of the other, like a deck of cards.

Q124. Is &&= a valid Java operator?
No, it is not.