The following statement compiles and executes What can you say for sure submarine dive depth

25 Questions  |  By AARATHI_123 | Last updated: Mar 19, 2022 | Total Attempts: 626

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Sequential Easy First Hard First

Basics of Java

• 1. 

  Import myLibrary.*; public class ShowSomeClass { // code for the class... }  What is the name of the java file containing this program?

  • A. 

    MyLibrary.java

  • B. 

    ShowSomeClass.java

  • C. 

    ShowSomeClass

  • D. 

    ShowSomeClass.class

• 2. 

  Which of the following is TRUE?

  • A. 

    In java, an instance field declared public generates a compilation error

  • B. 

    Int is the name of a class available in the package java.lang

  • C. 

    Instance variable names may only contain letters and digits.

  • D. 

    A class has always a constructor (possibly automatically supplied by the java compiler)

• 3. 

  String river = new String(“Columbia”); System.out.println(river.length());

  • A. 

    6

  • B. 

    Columbia

  • C. 

    8

  • D. 

    River

• 4. 

  Which of the following may be part of a class definition?

  • A. 

    Instance variables

  • B. 

    Instance methods

  • C. 

    Constructors

  • D. 

    All of the above

• 5. 

  What is different between a Java applet and a Java application?

  • A. 

    An application can in general be trusted whereas an applet can't

  • B. 

    An applet must be executed in a browser environment.

  • C. 

    An applet is not able to access the files of the computer it runs on

  • D. 

    (A), (B) and (C).

• 6. 

  Public class MyClass{ public MyClass(){/*code*/} // more code... } To instantiate MyClass, you would write?

  • A. 

    MyClass mc = new MyClass();

  • B. 

    MyClass mc = MyClass();

  • C. 

    MyClass mc = MyClass;

  • D. 

    It can't be done. The constructor of MyClass should be defined as public void MyClass(){/*code*/}

• 7. 

  What is byte code in the context of Java?

  • A. 

    The type of code generated by a Java compiler

  • B. 

    The type of code generated by a Java Virtual Machine

  • C. 

    It is the code written within the instance methods of a class.

  • D. 

    It is another name for comments written within a program.

• 8. 

  What is garbage collection in the context of Java?

  • A. 

    The operating system periodically deletes all of the java files available on the system

  • B. 

    Any package imported in a program and not used is automatically deleted

  • C. 

    When all references to an object are gone, the memory used by the object is automatically reclaimed.

  • D. 

    . The JVM checks the output of any Java program and deletes anything that doesn't make sense.

• 9. 

  You read the following statement in a Java program that compiles and  executes.       submarine.dive(depth); What can you say for sure?

  • A. 

    Depth must be an int

  • B. 

    Dive must be a method

  • C. 

    Dive must be the name of an instance field.

  • D. 

    Submarine must be the name of a class

• 10. 

  Which will legally declare, construct, and initialize an array?                

  • A. 

    Int [] myList = {"1", "2", "3"};

  • B. 

    Int [] myList = (5, 8, 2);

  • C. 

    Int myList [] [] = {4,9,7,0};

  • D. 

    Int myList [] = {4, 3, 7};

• 11. 

  Which is a reserved word in the Java programming language?

  • A. 

    Method

  • B. 

    Native

  • C. 

    Subclass

  • D. 

    Reference

• 12. 

  Which is a valid keyword in java?

  • A. 

    Interface

  • B. 

    String

  • C. 

    Float

  • D. 

    Unsigned

• 13. 

  public interface Foo { int k = 4; /* Line 3 */ } Which three piece of codes are equivalent to line 3?

  • A. 

    Final int k = 4;

  • B. 

    Public int k = 4;

  • C. 

    Static int k = 4;

  • D. 

    Abstract int k = 4;

  • E. 

    Volatile int k = 4;

• 14. 

  Which one is a valid declaration of a boolean?

  • A. 

    Boolean b1 = 0;

  • B. 

    Boolean b2 = 'false';

  • C. 

    Boolean b3 = false;

  • D. 

    Boolean b4 = Boolean.false();

• 15. 

  What will be the output of the program? public class Foo { public static void main(String[] args) { try { return; } finally { System.out.println( "Finally" ); } } }

  • A. 

    Finally

  • B. 

    Compilation fails.

  • C. 

    The code runs with no output.

  • D. 

    An exception is thrown at runtime.

• 16. 

  What will be the output of the program? try { int x = 0; int y = 5 / x; } catch (Exception e) { System.out.println("Exception"); } catch (ArithmeticException ae) { System.out.println(" Arithmetic Exception"); } System.out.println("finished");

  • A. 

    Finished

  • B. 

    Exception

  • C. 

    Compilation fails.

  • D. 

    Arithmetic Exception

• 17. 

  What will be the output of the program? public class MyProgram { public static void main(String args[]) { try { System.out.print("Hello world "); } finally { System.out.println("Finally executing "); } } }

  • A. 

    Nothing. The program will not compile because no exceptions are specified.

  • B. 

    Nothing. The program will not compile because no catch clauses are specified.

  • C. 

    Hello world.

  • D. 

    Hello world Finally executing

• 18. 

  What will be the output of the program? class Equals { public static void main(String [] args) { int x = 100; double y = 100.1; boolean b = (x = y); /* Line 7 */ System.out.println(b); } }

  • A. 

    True

  • B. 

    False

  • C. 

    Compilation fails

  • D. 

    An exception is thrown at runtime

• 19. 

  Which class does not override the equals() and hashcode() methods, inheriting them directly from class Object?

  • A. 

    Java.lang.String

  • B. 

    Java.lang.Double

  • C. 

    Java.lang.StringBuffer

  • D. 

    Java.lang.Character

• 20. 

  You need to store elements in a collection that guarantees that no duplicates are stored. Which one of the following interfaces provide that capability?

  • A. 

    Java.util.Map

  • B. 

    Java.util.List

  • C. 

    Java.util.Collection

  • D. 

    None of the above

• 21. 

  What is the name of the method used to start a thread execution?

  • A. 

    Init();

  • B. 

    Start();

  • C. 

    Run();

  • D. 

    Resume();

• 22. 

  Which two are valid constructors for Thread?

  • A. 

    Thread(Runnable r, String name)

  • B. 

    Thread()

  • C. 

    Thread(int priority)

  • D. 

    Thread(Runnable r, ThreadGroup g)

• 23. 

  Which cannot directly cause a thread to stop executing?

  • A. 

    Calling the SetPriority() method on a Thread object.

  • B. 

    Calling the wait() method on an object.

  • C. 

    Calling notify() method on an object.

  • D. 

    Calling read() method on an InputStream object.

• 24. 

  Which of the following will directly stop the execution of a Thread?

  • A. 

    Wait()

  • B. 

    Notify()

  • C. 

    Notifyall()

  • D. 

    Exits synchronized code

• 25. 

  Which two of the following methods are defined in class Thread?

  • A. 

    Start()

  • B. 

    Notify()

  • C. 

    Run()

  • D. 

    Terminate()

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