Which of the following pairs fill in the blanks to output 6?
❌ A. ArrayList and put(1, 6) ❌ B. ArrayList and replace(1, 6) ✅ C. ArrayList and set(1, 6) ❌ D. HashSet and put(1, 6) ❌ E. HashSet and replace(1, 6) ❌ F. HashSet and set(1, 6) ❌ G. The code does not compile with any of these options.
Explanation: The put() method is used on a Map rather than a List or Set, making options A and D incorrect. The replace() method does not exist on either of these interfaces. Finally, the set method is valid on a List rather than a Set because a List has an index. Therefore, option C is correct.
Which of the following pairs fill in the blanks to output 6?
❌ A. ArrayList and put(1, 6) ❌ B. ArrayList and replace(1, 6) ✅ C. ArrayList and set(1, 6) ❌ D. HashSet and put(1, 6) ❌ E. HashSet and replace(1, 6) ❌ F. HashSet and set(1, 6) ❌ G. The code does not compile with any of these options.
Explanation: The put() method is used on a Map rather than a List or Set, making options A and D incorrect. The replace() method does not exist on either of these interfaces. Finally, the set method is valid on a List rather than a Set because a List has an index. Therefore, option C is correct.
BY Explanations “Top Java Quiz Questions”
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Bitcoin is a decentralized digital currency that you can buy, sell and exchange directly, without an intermediary like a bank. Bitcoin’s creator, Satoshi Nakamoto, originally described the need for “an electronic payment system based on cryptographic proof instead of trust.” Each and every Bitcoin transaction that’s ever been made exists on a public ledger accessible to everyone, making transactions hard to reverse and difficult to fake. That’s by design: Core to their decentralized nature, Bitcoins aren’t backed by the government or any issuing institution, and there’s nothing to guarantee their value besides the proof baked in the heart of the system. “The reason why it’s worth money is simply because we, as people, decided it has value—same as gold,” says Anton Mozgovoy, co-founder & CEO of digital financial service company Holyheld.
