Tag: programming languages

Questions Related to programming languages

Running thread can't come back to runnable state directly.

technology programming languages

  1. True

  2. False

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Correct Option: B

Given:interface Foo {}class Alpha implements Foo { }class Beta extends Alpha {} class Delta extends Beta {public static void main( String[] args) { Beta x = new Beta(); // insert code here}}Which code, inserted at line 16, will cause a java.lang.ClassCastException?
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  1. Alpha a = x;

  2. Foo f= (Delta)x;

  3. Foo f= (Alpha)x;

  4. Beta b = (Beta)(Alpha)x;

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Correct Option: A,B,C,D

Given the following directory tree, you must enable assertions for everything except for FileTwo. base |firstLevelDirectory |_Foo |_Bar | secLevelDirectory |_FileOne |_FileTwo What command-line code should you use?
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    1. java -ea -da:base.firstLevelDirectory.secLevelDirectory.FileTwo
    1. java -ea:base.firstLevelDirectory.secLevelDirectory.FileTwo -da
    1. java -ea:base... -da:base.firstLevelDirectory.secLevelDirectory...
    1. java -enableassertions -disableassertions:base.FileTwo
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Correct Option: A

You are considering four different "if" statements for the following code: public class IsItSame { public static void main(String [] args ) { int TheAnswer = 0; IsItSame x = new IsItSame(); Object y = x; IsItSame z = new IsItSame(); if (z == x) TheAnswer = 0; if (y == x) TheAnswer = 1; if (y == z) TheAnswer = 2; if (y.equals(z) ) TheAnswer = 3: if (x.equals(z) ) TheAnswer = 4; if (z.equals(y) ) TheAnswer = 5; System.out.printIn("The answer is " + TheAnswer); } } What will be printed out once the code is compiled and executed?

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    1. The answer is 0
    1. The answer is 1
    1. The answer is 2
    1. The answer is 3
    1. The answer is 4
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Correct Option: B

Which of the following options is a benefit of a Set or SortedSet? Incorrect. The correct option is as follows

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    1. Use of an index
    1. Lack of duplicates
    1. Use of non-unique keys
    1. Use of unique keys
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Correct Option: C

Given: 11. public class Ball { 12. public enum Color { RED, GREEN, BLUE }; 13. public void foo() { 14. // insert code here 15. { System.out.println(c); } 16. } 17. } Which code inserted at line 14 causes the foo method to print RED, GREEN, and BLUE?
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  1. for( Color c : Color.values())

  2. for( Color c = RED; c <= BLUE; c++)

  3. for( Color c; c.hasNext() ; c.next())

  4. for( Color c = Color[0]; c <= Color[2]; c++)

  5. for( Color c = Color.RED; c <= Color.BLUE; c++)

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Correct Option: A

You have the following code: public class Java { static double dSyntaxs; public static void main (String [] args) { Java IsItTrue = new Java(); IsItTrue.TrueSyntax(); } public void TrueSyntax() { System.out.println("Its: " + dSyntaxs); } } What would the output be?
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    1. Its: 1
    1. Its: 0
    1. Its: true

  4. 4 Its: false

    1. Its: 0.0
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Correct Option: E

which methods would prevent the execution of a thread? (Choose all that apply)
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    1. sleep()
    1. yield()
    1. run()
    1. join()
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Correct Option: A,B,D

Given: 10. public class Fabric 11. public enum Color { 12. RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff); 13. private final int rgb; 14. Color( int rgb) { this.rgb = rgb; } 15. public int getRGB() { return rgb; } 16. }; 17. public static void main( String[] argv) { 18. // insert code here 19. } 20. } Which two code fragments, inserted independently at line 18, allow the Fabric class to compile?

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  1. Color skyColor = BLUE;

  2. Color treeColor = Color.GREEN;

  3. Color purple = new Color( 0xff00ff);

  4. if( RED.getRGB() < BLUE.getRGB() ) {}

  5. Color purple = Color.BLUE + Color.RED;

  6. if( Color.RED.ordinal() < Color.BLUE.ordinal() ) {}

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Correct Option: B,F

Which of the following conversions paths are widening conversions? (Choose two) You have not made any correct choices. The correct options are as follows
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  1. 1From a int to a short

  2. 2From a char to an int

  3. 3From a short to an int

  4. 4From a double to a float

  5. 5From a float to a long

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Correct Option: B,C