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Which of these correctly declares a Thread subclass with a name fixed at construction?

  • A.class Worker extends Thread { Worker(String n) { super.setName(); } }
  • B.class Worker extends Thread { Worker() { super("worker"); } }
  • C.class Worker extends Thread { Worker() { this.name = "worker"; } }
  • D.class Worker extends Thread { Worker() { Thread("worker"); } }

Answer: B

Thread has a constructor taking a name, so a subclass passes it up with super. The name field is private, a superclass constructor cannot be called like a method, and setName takes an argument. setName may also be used after construction.

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