Tag: technology

Quizzes (307) Questions (36705)

Questions Related to technology

Multiple choice technology programming languages

Given: 1. class Example { 2. public static void main(String[] args) { 3. Short s = 15; 4. Boolean b; 5. // insert code here 6. } 7. } Which, inserted independently at line 5, will compile? (Choose all that apply.)

  1. b = (Number instanceof s);

  2. b = (s instanceof Short);

  3. b = s.instanceof(Short);

  4. b = (s instanceof Number);

  5. b = s.instanceof(Object);

  6. b = (s instanceof String);
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Full explanation
Multiple choice technology programming languages

Given two files: 1. class One { 2. public static void main(String[] args) { 3. int assert = 0; 4. } 5. } 1. class Two { 2. public static void main(String[] args) { 3. assert(false); 4. } 5. } 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 What is the result? (Choose all that apply.)

  1. Only one compilation will succeed.

  2. Exactly two compilations will succeed.

  3. Exactly three compilations will succeed.

  4. All four compilations will succeed.

  5. No compiler warnings will be produced.

  6. At least one compiler warning will be produced.
Reveal answer Fill a bubble to check yourself
B,F Correct answer
Full explanation
Multiple choice technology programming languages

Given: class Mixer { Mixer() { } Mixer(Mixer m) { ml = m;} Mixer m1; public static void main(String[] args) { Mixer m2 = new Mixer(); Mixer m3 = new Mixer(m2); m3.go(); Mixer m4 = m3.m1; m4.go(); Mixer m5 = m2.m1; m5.go(); } void go() { System.out.print("hi "); } } What is the result?

  1. hi

  2. hi hi

  3. hi hi hi

  4. Compilation fails

  5. hi, followed by an exception

  6. hi hi, followed by an exception
Reveal answer Fill a bubble to check yourself
F Correct answer
Full explanation
Multiple choice technology programming languages

Given: 1. class Zippy { 2. String[] x; 3. int[] a [] = {{1,2}, {l}}; 4. Object c = new long [4] ; 5. Object[] d = x; 6. } What is the result?

  1. Compilation succeeds.

  2. Compilation fails due only to an error on line 3

  3. Compilation fails due only to an error on line 4

  4. Compilation fails due only to an error on line 5

  5. Compilation fails due to errors on lines 3 and 5

  6. Compilation fails due to errors on lines 3, 4, and 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice technology programming languages

Given: class Fizz { int x = 5; public static void main(String[] args) { final Fizz f1 = new Fizz(); Fizz f2 = new Fizz(); Fizz f3 = FizzSwitch(f1,f2); System.out.println((f1 == f3) + " " + (f1.x == f3.x)); } static Fizz FizzSwitch(Fizz x, Fizz y) { final Fizz z = x; z.x = 6; return z; } } What is the result?

  1. true true

  2. false true

  3. true false

  4. false false

  5. Compilation fails.

  6. An exception is thrown at runtime
Reveal answer Fill a bubble to check yourself
A Correct answer
Full explanation
Multiple choice technology programming languages

Given: class Knowing { static final long tooth = 343L; static long doIt(long tooth) { System.out.print(++tooth + " "); return ++tooth; } public static void main(String[] args) { System.out.print(tooth + " "); final long tooth = 340L; new Knowing().doIt(tooth); System.out.println(tooth); } } What is the result?

  1. 343 340 340

  2. 343 340 342

  3. 343 341 342

  4. 343 341 340

  5. Compilation fails.

  6. An exception is thrown at runtime
Reveal answer Fill a bubble to check yourself
D Correct answer
Full explanation
Multiple choice technology programming languages

Given: 1. class Eco { 2. public static void main(String[] args) { 3. Eco e1 = new Eco(); 4. Eco e2 = new Eco(); 5. Eco e3 = new Eco(); 6. e3.e = e2; 7. e1.e = e3; 8. e2 = null; 9. e3 = null; 10. e2.e = el; 11. e1 = null; 12. } 13. Eco e; 14. } At what point is only a single object eligible for GC?

  1. After line 8 runs

  2. After line 9 runs.

  3. After line 10 runs.

  4. After line 11 runs.

  5. An exception is thrown at runtime.

  6. Never in this program
Reveal answer Fill a bubble to check yourself
E Correct answer
Full explanation