Java SE 8 Programmer II (1Z0-809)

Question : 5 of 8

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Which class definition compiles?

class CallerThread1 implements Callable { public String call() throws Exception { return "thread";} }
class CallerThread2 implements Callable { public void call() {} }
class CallerThread3 extends Callable { public void call() throws IOException {} }
class CallerThread4 implements Callable { public String call(String s) { return "thread";} }
class CallerThread5 extends Callable { public void callable(String s) throws Exception {} }

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