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5. Exception Handling
Q: 13 Click the Exhibit button. Given: 31. public void method() { 32. A a = new A(); 33. a.method1(); 34. } Which statement is true if a TestException is thrown on line 3 of class B? A. Line 33 must be called within a try block. B. The exception thrown by method1 in class A is not required to be caught. C. The method declared on line 31 must be declared to throw a RuntimeException. D. On line 5 of class A, the call to method2 of class B does not need to be placed in a try/catch block. Answer: B Q: 14 Click the Exhibit button. Which statement is true about the two classes? A. Compilation of both classes will fail. B. Compilation of both classes will succeed. C. Compilation of class A will fail. Compilation of class B will succeed. D. Compilation of class B will fail. Compilation of class A will succeed. Answer: D Question: 15 Click the Exhibit button. Class TestException 1. public class TestException extends Exception { 2. } Class A: 1. public class A { 2. 3. public String sayHello(String name) throws TestException { 4. 5. if(name == null) { 6. throw new TestException(); 7. } 8. 9. return “Hello “+ name; 10. } 11. 12. } A programmer wants to use this code in an application: 45. A a=new A(); 46. System.out.println(a.sayHello(”John”)); Which two are true? (Choose two.) A. Class A will not compile. B. Line 46 can throw the unchecked exception TestException. C. Line 45 can throw the unchecked exception TestException. D. Line 46 will compile if the enclosing method throws a TestException. E. Line 46 will compile if enclosed in a try block, where TestException is caught. Answer: DE Question:16 Given: 11.classA { 12. public void process() { System.out.print(”A “); } } 13. class B extends A { 14. public void process() throws RuntimeException { 15. super.process(); 16. if (true) throw new RuntimeException(); 17. System.out.print(“B”); }} 18. public static void main(String[] args) { 19. try { ((A)new B()).process(); } 20. catch (Exception e) { System.out.print(”Exception “); } 21. } What is the result? A. Exception B. A Exception C. A Exception B D. A B Exception E. Compilation fails because of an error in line 14. F. Compilation fails because of an error in line 19. Answer: B
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