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6: Practice Exam 3
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21 Given the proper imports, and given:
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23 24 25 26 27 String s = "123 888888 x 345 -45"; Scanner sc = new Scanner(s); while(schasNext()) if(schasNextShort()) Systemoutprint(scnextShort() + " ");
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What is the result A The output is 123 345 B The output is 123 345 -45 C The output is 123 888888 345 -45 D The output is 123 followed by an exception E The output is 123 followed by an infinite loop 22 Given:
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1 interface Horse { public void nicker(); }
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Which will compile (Choose all that apply) A public class Eyra implements Horse { public void nicker() { } } B public class Eyra implements Horse { public void nicker(int x) { } } C public class Eyra implements Horse { public void nicker() { Systemoutprintln("huhuhuhuh"); } } D public abstract class Eyra implements Horse { public void nicker(int loud) { } } E public abstract class Eyra implements Horse { public void nicker(int loud) ; } 23 Given:
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2 3 4 5 6 7 8 9 10 11 12 public class LaoTzu extends Philosopher { public static void main(String[] args) { new LaoTzu(); new LaoTzu("Tigger"); } LaoTzu() { this("Pooh"); } LaoTzu(String s) { super(s); } } class Philosopher { Philosopher(String s) { Systemoutprint(s + " "); } }
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Practice Exam 3
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What is the result A Pooh Pooh B Pooh Tigger C Tigger Pooh D Tigger Tigger E Compilation fails due to a single error in the code F Compilation fails due to multiple errors in the code 24 Which are capabilities of Java s assertion mechanism (Choose all that apply) A You can, at the command line, enable assertions for a specific class B You can, at the command line, disable assertions for a specific package C You can, at runtime, enable assertions for any version of Java D It s considered appropriate to catch and handle an AssertionError programmatically E You can programmatically test whether assertions have been enabled without throwing an AssertionError 25 Given:
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4 public class Stone implements Runnable { 5 static int id = 1; 6 public void run() { 7 try { 8 id = 1 - id; 9 if(id == 0) { pick(); } else { release(); } 10 } catch(Exception e) { } 11 } 12 private static synchronized void pick() throws Exception { 13 Systemoutprint("P "); Systemoutprint("Q "); 14 } 15 private synchronized void release() throws Exception { 16 Systemoutprint("R "); Systemoutprint("S "); 17 } 18 public static void main(String[] args) { 19 Stone st = new Stone(); 20 new Thread(st)start(); 21 new Thread(st)start(); 22 } }
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Which are true (Choose all that apply) A The output could be P Q R S B The output could be P R S Q
C D E F
6: Practice Exam 3
The output could be P R Q S The output could be P Q P Q The program could cause a deadlock Compilation fails
3 public class States { 4 static String s; 5 static Boolean b; 6 static Boolean t1() { return new Boolean("howdy"); } 7 static boolean t2() { return new Boolean(s); } 8 public static void main(String[] args) { 9 if(t1()) Systemoutprint("t1 "); 10 if(!t2()) Systemoutprint("t2 "); 11 if(t1() != t2()) Systemoutprint("!= "); 12 } 13 }
26 Given:
Which are true (Choose all that apply) A Compilation fails B No output is produced C The output will contain "t1 " D The output will contain "t2 " E The output will contain "!= " F The output is "t1 ", followed by an exception 27 Which are valid command-line switches when working with assertions (Choose all that apply) A -ea B -da C -dsa D -eva E -enableassertions 28 Given:
4 class Account { Long acctNum, password; } 5 public class Banker { 6 public static void main(String[] args) { 7 new Banker()go(); 8 // do more stuff 9 }
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