SECTION-1 Q.1.Which two code fragments are most likely to cause a StackOverflowError? (Choose two.)
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1 SECTION-1 Q.1.Which two code fragments are most likely to cause a StackOverflowError? (Choose two.) A. int []x = 1,2,3,4,5; for(int y = 0; y < 6; y++) System.out.println(x[y]); B. staticint[] x = 7,6,5,4; static x[1] = 8; x[4] = 3; C. for(int y = 10; y < 10; y++) dostuff(y); D. voiddoone(int x) dotwo(x); voiddotwo(int y) dothree(y); voiddothree(int z) dotwo(z); E. for(int x = 0; x < ; x++) dostuff(x); F. void counter(inti) counter(++i); Page 1
2 Q class A public void process() System.out.print("A,"); class B extends A public void process() throwsioexception super.process(); 13. System.out.print("B,"); 14. thrownewioexception(); public static void main(string[] args) try new B().process(); catch (IOException e) System.out.println("Exception"); What is the result? A. Exception B. A,B,Exception C. Compilation fails because of an error in line 14. D. Compilation fails because of an error in line 10. E. A NullPointerException is thrown at runtime. Q public void go(int x) 12. assert (x > 0); Page 2
3 13. switch(x) 14. case 2: ; 15. default: assert false; private void go2(int x) assert (x < 0); Which statement is true? A. All of the assert statements are used appropriately. B. Only the assert statement on line 12 is used appropriately. C. Only the assert statement on line 15 is used appropriately. D. Only the assert statement on line 18 is used appropriately. E. Only the assert statements on lines 12 and 15 are used appropriately. F. Only the assert statements on lines 12 and 18 are used appropriately. G. Only the assert statements on lines 15 and 18 are used appropriately. Q.4 Given: public class Breaker2 static String o = ""; public static void main(string[] args) z: for(int x = 2; x < 7; x++) if(x==3) continue; if(x==5) break z; o = o + x; System.out.println(o); Page 3
4 A. 2 B. 24 C. 234 D. 246 E F. Compilation fails. Q.5. public static void main(string[] args) String str = "null"; if (str == null) System.out.println("null"); else (str.length() == 0) System.out.println("zero"); else System.out.println("some"); A. null B. zero C. some D. Compilation fails. E. An exception is thrown at runtime. Q.6. public class Test public static void main(string [] args) int x = 5; boolean b1 = true; boolean b2 = false; Page 4
5 if ((x == 4) &&!b2 ) System.out.print("1 "); System.out.print("2 "); if ((b2 = true) && b1 ) System.out.print("3 "); A. 2 B. 3 C. 1 2 D. 2 3 E F. Compilation fails. G. An exception is thrown at runtime. Q.7. static void test() throws Error if (true) thrownewassertionerror(); System.out.print("test "); public static void main(string[] args) try test(); catch (Exception ex) System.out.print("exception "); System.out.print("end "); A. end Page 5
6 B. Compilation fails. C. exception end D. exception test end E. A Throwable is thrown by main. F. An Exception is thrown by main. Q.8. public class Foo static int[] a; static a[0]=2; public static void main( String[] args ) Which exception or error will be thrown when a programmer attempts to run this code? A. java.lang.stackoverflowerror B. java.lang.illegalstateexception C. java.lang.exceptionininitializererror D. java.lang.arrayindexoutofboundsexception Q.9. public static void main(string[] args) for (int i = 0; i<= 10; i++) if (i> 6) break; System.out.println(i); Page 6
7 A. 6 B. 7 C. 10 D. 11 E. Compilation fails. F. An exception is thrown at runtime. Q static class A 12. void process() throws Exception throw new Exception(); static class B extends A 15. void process() System.out.println("B"); public static void main(string[] args) 18. new B().process(); 19. A. B B. The code runs with no output. C. Compilation fails because of an error in line 12. D. Compilation fails because of an error in line 15. E. Compilation fails because of an error in line 18. Q.11. public class Donkey public static void main(string[] args) boolean assertson = false; assert (assertson) : assertson = true; if(assertson) System.out.println("assert is on"); Page 7
8 If class Donkey is invoked twice, the first time without assertions enabled, and the second time with assertions enabled, what are the results? A. no output B. no output assert is on C. assert is on D. no output AnAssertionError is thrown. E. assert is on AnAssertionError is thrown. Q.12. Float pi = new Float(3.14f); if (pi > 3) System.out.print("pi is bigger than 3. "); else System.out.print("pi is not bigger than 3. "); finally System.out.println("Have a nice day."); A. Compilation fails. B. pi is bigger than 3. C. An exception occurs at runtime. D. pi is bigger than 3. Have a nice day. E. pi is not bigger than 3. Have a nice day. Q.13. public static void main(string[] args) try args = null; args[0] = "test"; System.out.println(args[0]); Page 8
9 catch (Exception ex) System.out.println("Exception"); catch (NullPointerException npe) System.out.println("NullPointerException"); A. test B. Exception C. Compilation fails. D. NullPointerException Q.14. public void go() String o = ""; z: for(int x = 0; x < 3; x++) for(int y = 0; y < 2; y++) if(x==1) break; if(x==2 && y==1) break z; o = o + x + y; System.out.println(o); What is the result when the go() method is invoked? A. 00 B C D Page 9
10 E. Compilation fails. F. An exception is thrown at runtime. Q.15. public class Test public enum Dogs collie, harrier ; public static void main(string [] args) Dogs mydog = Dogs.collie; switch (mydog) casecollie: System.out.print("collie "); caseharrier: System.out.print("harrier "); A. collie B. harrier C. Compilation fails. D. collie harrier E. An exception is thrown at runtime. Q public class Boxer1 2. Integer i; 3. int x; 4. public Boxer1(int y) 5. x = i+y; 6. System.out.println(x); 7. Page 10
11 8. public static void main(string[] args) 9. new Boxer1(new Integer(4)); A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. AnIllegalStateException occurs at runtime. Q static class A void process() throws Exception thrownew Exception(); static class B extends A void process() System.out.println("B"); public static void main(string[] args) new B().process(); 18. A. B B. The code runs with no output. C. Compilation fails because of an error in line 12. D. Compilation fails because of an error in line 15. E. Compilation fails because of an error in line Page 11
12 Q.18. public class Venus public static void main(string[] args) int [] x = 1,2,3; int y[] = 4,5,6; new Venus().go(x,y); void go(int[]... z) for(int[] a : z) System.out.print(a[0]); A. 1 B. 12 C. 14 D. 123 E. Compilation fails. F. An exception is thrown at runtime. Q.19. public class Foo staticint[] a; static a[0]=2; public static void main( String[] args ) Page 12
13 Which exception or error will be thrown when a programmer attempts to run this code? A. java.lang.stackoverflowerror B. java.lang.illegalstateexception C. java.lang.exceptionininitializererror D. java.lang.arrayindexoutofboundsexception Q class X public void foo() System.out.print("X "); public class SubBextends X publicvoid foo() throws RuntimeException super.foo(); 13. if (true) throw newruntimeexception(); 14. System.out.print("B "); public static void main(string[] args) new SubB().foo(); A. X, followed by an Exception. B. No output, and an Exception is thrown. C. Compilation fails due to an error on line 13. D. Compilation fails due to an error on line 18. E. Compilation fails due to an error on line Page 13
14 F. X, followed by an Exception, followed by B. SECTION-2 Q: public static void parse(string str) 12. try 13. float f = Float.parseFloat(str); 14. catch (NumberFormatExceptionnfe) 15. f = 0; 16. finally 17. System.out.println(f); public static void main(string[] args) 21. parse("invalid"); 22. A. 0.0 B. Compilation fails. C. A ParseException is thrown by the parse method at runtime. D. A NumberFormatException is thrown by the parse method at runtime. Q: try Page 14
15 85. ResourceConnection con = resourcefactory.getconnection(); 86. Results r = con.query("get INFO FROM CUSTOMER"); 87. info = r.getdata(); 88. con.close(); 89. catch (ResourceException re) 90. errorlog.write(re.getmessage()); return info; Which statement is true if a ResourceException is thrown on line 86? A. Line 92 will not execute. B. The connection will not be retrieved in line 85. C. The resource connection will not be closed on line 88. D. The enclosing method will throw an exception to its caller. Q: // some code here 32. try 33. // some code here 34. catch (SomeException se) 35. // some code here 36. finally 37. // some code here Page 15
16 Under which three circumstances will the code on line 37 be executed? (Choose three.) A. The instance gets garbage collected. B. The code on line 33 throws an exception. C. The code on line 35 throws an exception. D. The code on line 31 throws an exception. E. The code on line 33 executes successfully. Q: class A 12. public void process() System.out.print("A,"); 13. class B extends A 14. public void process() throws IOException 15. super.process(); 16. System.out.print("B,"); 17. throw new IOException(); public static void main(string[] args) 20. try new B().process(); 21. catch (IOException e) System.out.println("Exception"); A. Exception B. A,B,Exception C. Compilation fails because of an error in line Page 16
17 D. Compilation fails because of an error in line 14. E. A NullPointerException is thrown at runtime. Q: static void test() throws Error 12. if (true) throw new AssertionError(); 13. System.out.print("test "); public static void main(string[] args) 16. try test(); 17. catch (Exception ex) System.out.print("exception "); 18. System.out.print("end "); 19. A. end B. Compilation fails. C. exception end D. exception test end E. A Throwable is thrown by main. F. An Exception is thrown by main. Q: Float pi = new Float(3.14f); 12. if (pi > 3) Page 17
18 13. System.out.print("pi is bigger than 3. "); else 16. System.out.print("pi is not bigger than 3. "); finally 19. System.out.println("Have a nice day."); 20. A. Compilation fails. B. pi is bigger than 3. C. An exception occurs at runtime. D. pi is bigger than 3. Have a nice day. E. pi is not bigger than 3. Have a nice day. Q: public static void main(string[] args) 12. try 13. args = null; 14. args[0] = "test"; 15. System.out.println(args[0]); 16. catch (Exception ex) 17. System.out.println("Exception"); Page 18
19 18. catch (NullPointerExceptionnpe) 19. System.out.println("NullPointerException"); A. test B. Exception C. Compilation fails. D. NullPointerException Q:08. Given: 25. try 26. A a = new A(); 27. a.method1(); 28. catch (Exception e) 29. System.out.print("an error occurred"); 30. Which two statements are true if a NullPointerException is thrown on line 3 of class C? (Choose two.) Page 19
20 A. The application will crash. B. The code on line 29 will be executed. C. The code on line 5 of class A will execute. D. The code on line 5 of class B will execute. E. The exception will be propagated back to line 27. Q: static void test() throws RuntimeException 12. try 13. System.out.print("test "); 14. throw new RuntimeException(); catch (Exception ex) System.out.print("exception "); public static void main(string[] args) Page 20
21 19. try test(); 20. catch (RuntimeException ex) System.out.print("runtime "); 21. System.out.print("end "); 22. A. test end B. Compilation fails. C. test runtime end D. test exception end E. A Throwable is thrown by main at runtime. Q: try 34. // some code here 35. catch (NullPointerException e1) 36. System.out.print("a"); 37. catch (RuntimeException e2) 38. System.out.print("b"); 39. finally 40. System.out.print("c"); 41. What is the result if a NullPointerException occurs on line 34? A. c Page 21
22 B. a C. ab D. ac E. bc F. abc Q: public class Foo 11. staticint[] a; 12. static a[0]=2; 13. public static void main( String[] args ) 14. Which exception or error will be thrown when a programmer attempts to run this code? A. java.lang.stackoverflowerror B. java.lang.illegalstateexception C. java.lang.exceptionininitializererror D. java.lang.arrayindexoutofboundsexception Q: static void test() 12. try 13. String x = null; 14. System.out.print(x.toString() + " "); Page 22
23 16. finally System.out.print("finally "); public static void main(string[] args) 19. try test(); 20. catch (Exception ex) System.out.print("exception "); 21. A. null B. finally C. null finally D. Compilation fails. E. finally exception Q: 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? Page 23
24 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. Q: 14 Which statement is true about the two classes? Page 24
25 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. Question: 15 class TestException 1. public class TestException extends Exception 2. class A: 1. public class A public String sayhello(string name) throws TestException if(name == null) 6. throw new TestException(); Page 25
26 return Hello + name; 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. Question:16 11.classA 12. public void process() System.out.print( A ); 13. class B extends A 14. public void process() throws RuntimeException 15. super.process(); Page 26
27 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. 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. Q.17. import java.io.*; class Master String dofilestuff() throws FileNotFoundException return "a"; class Slave extends Master public static void main(string[] args) String s = null; try s = new Slave().doFileStuff(); Page 27
28 catch ( Exception x) s = "b"; System.out.println(s); // insert code here Which, inserted independently at // insert code here, will compile, and produce the output b? (Choose all that apply.) A. String dofilestuff() return "b"; B. String dofilestuff() throws IOException return "b"; C. String dofilestuff(int x) throws IOException return "b"; D. String dofilestuff() throws FileNotFoundException return "b"; E. String dofilestuff() throws NumberFormatException return "b"; F. String dofilestuff() throws NumberFormatException, FileNotFoundException return "b"; This method doesn t override, so the output is a. Q.18. class Input public static void main(string[] args) String s = "-"; try domath(args[0]); Page 28
29 s += "t "; // line 6 finally System.out.println(s += "f "); public static void domath(string a) int y = 7 / Integer.parseInt(a); And the command-line invocations: java Input java Input 0 Which are true? (Choose all that apply.) A. Line 6 is executed exactly 0 times. B. Line 6 is executed exactly 1 time. C. Line 6 is executed exactly 2 times. D. The finally block is executed exactly 0 times. E. The finally block is executed exactly 1 time. F. The finally block is executed exactly 2 times. G. Both invocations produce the same exceptions. H. Each invocation produces a different exception. Q.19. class Plane Page 29
30 static String s = "-"; public static void main(string[] args) new Plane().s1(); System.out.println(s); void s1() try s2(); catch (Exception e) s += "c"; void s2() throws Exception s3(); s += "2"; s3(); s += "2b"; void s3() throws Exception throw new Exception(); A. - B. -c C. -c2 D. -2c E. -c22b Page 30
31 F. -2c2b G. -2c2bc H. Compilation fails. Q.20. try int x = Integer.parseInt("two"); Which could be used to create an appropriate catch block? (Choose all that apply.) A. ClassCastException B. IllegalStateException C. NumberFormatException D. IllegalArgumentException E. ExceptionInInitializerError F. ArrayIndexOutOfBoundsException Q class Ping extends Utils 2. public static void main(string [] args) 3. Utils u = new Ping(); 4. System.out.print(u.getInt(args[0])); intgetint(string arg) 7. returninteger.parseint(arg); 8. Page 31
32 classutils 11. intgetint(string x) throws Exception return 7; 12. And the following three possible changes: C1. Declare that main() throws an Exception. C2. Declare that Ping.getInt() throws an Exception. C3. Wrap the invocation of getint() in a try / catch block. Which change(s) allow the code to compile? (Choose all that apply.) A. Just C1 is sufficient. B. Just C2 is sufficient. C. Just C3 is sufficient. D. Both C1 and C2 are required. E. Both C1 and C3 are required. F. Both C2 and C3 are required. G. All three changes are required. Q.22. class Emu static String s = "-"; public static void main(string[] args) try throw new Exception(); Page 32
33 catch (Exception e) try try throw new Exception(); catch (Exception ex) s += "ic "; throw new Exception(); catch (Exception x) s += "mc "; finally s += "mf "; finally s += "of "; System.out.println(s); A. -ic of B. -mf of C. -mc mf D. -ic mf of E. -ic mc mf of F. -ic mc of mf G. Compilation fails. Q.23. class Mineral class Gem extends Mineral Page 33
34 class Miner staticint x = 7; static String s = null; public static void getweight(mineral m) int y = 0 / x; System.out.print(s + " "); public static void main(string[] args) Mineral[] ma = new Mineral(), new Gem(); for(object o : ma) getweight((mineral) o); And the command-line invocation: java Miner.java A. null B. null null C. A ClassCastException is thrown. D. A NullPointerException is thrown. E. A NoClassDefFoundError is thrown. F. AnArithmeticException is thrown. Page 34
35 G. AnIllegalArgumentException is thrown. H. AnArrayIndexOutOfBoundsException is thrown. Q.24. Which are most typically thrown by an API developer or an application developer as opposed to being thrown by the JVM? (Choose all that apply.) A. ClassCastException B. IllegalStateException C. NumberFormatException D. IllegalArgumentException E. ExceptionInInitializerError Q: public class test SECTION-3 9. public static void main(string [] a) 10. asserta.length == 1; Which two will produce an AssertionError? (Choose two.) A. java test B. java -ea test C. java test file1 D. java -ea test file1 Page 35
36 E. java -ea test file1 file2 F. java -ea:test test file1 Q: 02 Given a method that must ensure that its parameter is not null: 11. public void somemethod(object value) 12. // check for null value System.out.println(value.getClass()); 21. What, inserted at line 12, is the appropriate way to handle a null value? A. assert value == null; B. assert value!= null, "value is null"; C. if (value == null) throw new AssertionException("value is null"); D. if (value == null) throw new IllegalArgumentException("value is null"); Q: int z = 5; public void stuff1(int x) Page 36
37 26. assert (x > 0); 27. switch(x) 28. case 2: x = 3; 29. default: assert false; private void stuff2(int y) assert (y < 0); private void stuff3() assert (stuff4()); privateboolean stuff4() z = 6; return false; Which statement is true? A. All of the assert statements are used appropriately. B. Only the assert statement on line 31 is used appropriately. C. The assert statements on lines 29 and 31 are used appropriately. D. The assert statements on lines 26 and 29 are used appropriately. E. The assert statements on lines 29 and 33 are used appropriately. F. The assert statements on lines 29, 31, and 33 are used appropriately. G. The assert statements on lines 26, 29, and 31 are used appropriately. Question: 04 Click the Exhibit button. 1. public class Test 2. Page 37
38 3. public static void main(string [] args) 4. boolean assert = true; 5. if(assert) 6. System.out.println( assert is true ); Given: javac -source 1.3 Test.java A. Compilation fails. B. Compilation succeeds with errors. C. Compilation succeeds with warnings. D. Compilation succeeds without warnings or errors. 05. Given two files: 1. class One 2. public static void main(string[] args) 3. int assert = 0; 4. Page 38
39 5. 1. class Two 2. public static void main(string[] args) 3. assert(false); And the four command-line invocations: javac -source 1.3 One.java javac -source 1.4 One.java javac -source 1.3 Two.java javac -source 1.4 Two.java (Choose all that apply.) A. Only one compilation will succeed. B. Exactly two compilations will succeed. C. Exactly three compilations will succeed. D. All four compilations will succeed. E. No compiler warnings will be produced. F. At least one compiler warning will be produced. Q.06. Which are true? (Choose all that apply.) A. It is appropriate to use assertions to validate arguments to methods marked public. Page 39
40 B. It is appropriate to catch and handle assertion errors. C. It is NOT appropriate to use assertions to validate command-line arguments. D. It is appropriate to use assertions to generate alerts when you reach code that should notbe reachable. E. It is NOT appropriate for assertions to change a program s state. Page 40
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