Assessment Test 1 in Java

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Assessment Test 1
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Which, inserted independently at line 7, compile (Choose all that apply) A B C D E if(b instanceof ff) Systemoutprint("1 "); if(binstanceof(ff)) Systemoutprint("2 "); if(b instanceof Feline) Systemoutprint("3 "); if(b instanceOf Feline) Systemoutprint("4 "); if(binstanceof(Feline)) Systemoutprint("5 ");
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2 public class Choosy { 3 public static void main(String[] args) { 4 String result = ""; 5 int x = 7, y = 8; 6 if(x == 3) { result += "1"; } 7 else if (x > 9) { result += "2"; } 8 else if (y < 9) { result += "3"; } 9 else if (x == 7) { result += "4"; } 10 else { result += "5"; } 11 Systemoutprintln(result); 12 } 13 }
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5 Given:
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What is the result (Choose all that apply) A B C D E F G 3 34 35 345 Compilation fails due to an error on line 5 Compilation fails due to errors on lines 8 and 9 Compilation fails due to errors on lines 7, 8, and 9
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1 public class Twine { 2 public static void main(String[] args) { 3 String s = ""; 4 StringBuffer sb1 = new StringBuffer("hi"); 5 StringBuffer sb2 = new StringBuffer("hi"); 6 StringBuffer sb3 = new StringBuffer(sb2); 7 StringBuffer sb4 = sb3; 8 if(sb1equals(sb2)) s += "1 "; 9 if(sb2equals(sb3)) s += "2 ";
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6 Given:
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1: Self-Assessment Test 1
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10 11 12 13 14 15 16 17 } 18 }
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if(sb3equals(sb4)) s += "3 "; String s2 = "hi"; String s3 = "hi"; String s4 = s3; if(s2equals(s3)) s += "4 "; if(s3equals(s4)) s += "5 "; Systemoutprintln(s);
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What is the result A B C D E F G H A B C D E F G 1 3 1 5 1 2 3 1 4 5 3 4 5 1 3 4 5 1 2 3 4 5 Compilation fails All classes of Exception extend Error All classes of Error extend Exception All Errors must be handled or declared All classes of Exception extend Throwable All Throwables must be handled or declared All Exceptions must be handled or declared RuntimeExceptions need never be handled or declared
2 import javautil*; 3 public class Birthdays { 4 public static void main(String[] args) { 5 Map<Friends, String> hm = new HashMap<Friends, String>(); 6 hmput(new Friends("Charis"), "Summer 2009"); 7 hmput(new Friends("Draumur"), "Spring 2002"); 8 Friends f = new Friends(args[0]); 9 Systemoutprintln(hmget(f)); 10 } 11 }
7 Which are true (Choose all that apply)
8 Given:
Assessment Test 1
12 class Friends { 13 String name; 14 Friends(String n) { name = n; } 15 }
And the command line invocation:
java Birthdays Draumur
What is the result A B C D E F G null Draumur Spring 2002 Compilation fails The output is unpredictable An exception is thrown at runtime Friends@XXXX (where XXXX is a representation of a hashcode)
2 3 4 5 6 7 8 9 10 11 12 13 import javautil*; class Cereal { } public class Flakes extends Cereal { public static void main(String[] args) { List<Flakes> c0 = new List<Flakes>(); List<Cereal> c1 = new ArrayList<Cereal>(); List<Cereal> c2 = new ArrayList<Flakes>(); List<Flakes> c3 = new ArrayList<Cereal>(); List<Object> c4 = new ArrayList<Flakes>(); ArrayList<Cereal> c5 = new ArrayList<Flakes>(); } }
9 Given:
Which are true (Choose all that apply) A B C D E F G Compilation succeeds Compilation fails due to an error on line 6 Compilation fails due to an error on line 7 Compilation fails due to an error on line 8 Compilation fails due to an error on line 9 Compilation fails due to an error on line 10 Compilation fails due to an error on line 11
1: Self-Assessment Test 1
10 Given:
3 4 5 6 7 8 9 10 11 12 13 14 15 public class RediMix extends Concrete { RediMix() { Systemoutprintln("r "); } public static void main(String[] args) { new RediMix(); } } class Concrete extends Sand { Concrete() { Systemoutprint("c "); } private Concrete(String s) { } } abstract class Sand { Sand() { Systemoutprint("s "); } }
What is the result A B C D E F G r c r r c s c r r c s Compilation fails due to a single error in the code Compilation fails due to multiple errors in the code
11 Which statement(s) are true (Choose all that apply) A Coupling is the OO principle most closely associated with hiding a class s implementation details B Coupling is the OO principle most closely associated with making sure classes know about other classes only through their APIs C Coupling is the OO principle most closely associated with making sure a class is designed with a single, well-focused purpose D Coupling is the OO principle most closely associated with allowing a single object to be seen as having many types 12 Given:
2 class Mosey implements Runnable { 3 public void run() { 4 for(int i = 0; i < 1000; i++) { 5 Systemoutprint(ThreadcurrentThread()getId() + "-" + i + " "); 6 } } }
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