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Practice Exam 1
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11 String s; 12 Beach() { s = "Beach"; } 13 Beach getBeach() { return this; } 14 }
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What is the result A Beach LaSelva Beach B Beach LaSelva LaSelva C Beach LaSelva followed by an exception D Compilation fails due to an error at line 5 E Compilation fails due to an error at line 6 F Compilation fails due to an error at line 8 G Compilation fails due to an error at line 13 34 When using the javaioConsole class, which are true (Choose all that apply) A Objects of type javaioConsole are created using a constructor from the same class B Objects of type javaioConsole are created using a method from the javaio File class C Objects of type javaioConsole are created using a method from the javalang System class D Objects of type javaioConsole are created using a method from the javalang Object class E The method(s) designed to read passwords can optionally disable the echoing of user input F The method(s) designed to read passwords return a char[] 35 Given:
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3 public class Stealth { 4 public static void main(String[] args) { 5 Integer i = 420; 6 Integer i2; 7 Integer i3; 8 i2 = iintValue(); 9 i3 = ivalueOf(420); 10 Systemoutprintln((i == i2) + " " + (i == i3)); 11 } }
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What is the result A true true B true false C false true
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3: Practice Exam 1
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D false false E Compilation fails F An exception is thrown at runtime 36 Given:
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2 3 4 5 6 7 8 9 10 11 12 13 14 15 import javaio*; interface Risky { String doStuff() throws Exception; Risky doCrazy(); void doInsane(); } class Bungee implements Risky { public String doStuff() throws IOException { throw new IOException(); } public Bungee doCrazy() { return new Bungee(); } public void doInsane() throws NullPointerException { throw new NullPointerException(); } }
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What is the result (Choose all that apply) A Compilation succeeds B The Risky interface will not compile C The BungeedoStuff() method will not compile D The BungeedoCrazy() method will not compile E The BungeedoInsane() method will not compile 37 Given that IllegalArgumentException extends RuntimeException, and given:
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11 12 13 14 15 16 17 18 19 20 21 22 23 24 static String s = ""; public static void main(String[] args) { try { doStuff(); } catch (Exception ex) { s += "c1 "; } Systemoutprintln(s); } static void doStuff() throws RuntimeException { try { s += "t1 "; throw new IllegalArgumentException(); } catch (IllegalArgumentException ie) { s += "c2 "; } throw new IllegalArgumentException(); }
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Practice Exam 1
What is the result A c1 t1 c2 B c2 t1 c1 C t1 c1 c2 D t1 c2 c1 E Compilation fails F An uncaught exception is thrown at runtime 38 Given:
1 public class Networking { 2 public static void main(String[] args) { 3 List<Integer> i = new LinkedList<Integer>(); 4 iadd(4); iadd(2); iadd(5); 5 int r = 1; 6 doStuff(r); 7 Systemoutprintln(iget(r)); 8 } 9 static int doStuff(int x) { 10 return ++x; 11 } }
What is the result A 2 B 4 C 5 D Compilation fails E An exception is thrown at runtime 39 Given:
1 import javautil*; 2 public class Unturned { 3 public static void main(String[] args) { 4 String[] towns = {"aspen", "vail", "t-ride", "dillon"}; 5 MySort ms = new MySort(); 6 Arrayssort(towns, ms); 7 Systemoutprintln(ArraysbinarySearch(towns, "dillon")); 8 } 9 static class MySort implements Comparator<String> { 10 public int compare(String a, String b) { 11 return bcompareTo(a); 12 } } }
3: Practice Exam 1
What is the most likely result A -1 B 1 C 2 D 3 E Compilation fails F An exception is thrown at runtime 40 Given:
2 3 4 5 6 7 8 9 10 class Weed { protected static String s = ""; final void grow() { s += "grow "; } static final void growFast() { s += "fast "; } } public class Thistle extends Weed { void grow() { s += "t-grow "; } void growFast() { s+= "t-fast "; } }
Which are the FEWEST change(s) required for this code to compile (Choose all that apply) A s must be marked public B Thistlegrow() must be marked final C Weedgrow() must NOT be marked final D WeedgrowFast() must NOT be marked final E WeedgrowFast() must NOT be marked static F ThistlegrowFast() must be removed from the class 41 Given:
2 import javautilregex*; 3 public class Decaf { 4 public static void main(String[] args) { 5 Pattern p = Patterncompile(args[0]); 6 Matcher m = pmatcher(args[1]); 7 while(mfind()) 8 Systemoutprint(mgroup() + " "); 9 } }
And the three command-line invocations: I java Decaf "0([0-7]) " "1012 0208 430" II java Decaf "0([0-7])*" "1012 0208 430" III java Decaf "0([0-7])+" "1012 0208 430"
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