Question 1 What is displayed on the console when running the following program?

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  • Question 1 What is displayed on the console when running the following program?

  • StudentMia 

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    August 13, 2021 at 1:22 pm

    Question:

    Question 1 What is displayed on the console when running the following program? public class Quiz2B { public static void main(String args) { try { System.out.println(“Welcome to Java”); int i = 0; int y = 2 / i; System.out.println(“Welcome to Java”); } catch (RuntimeException ex) { System.out.println(“Welcome to Java”); } finally { System.out.println(“End of the block”); } } }

    Question 1 options: The program displays Welcome to Java three times followed by End of the block. The program displays Welcome to Java three times. The program displays Welcome to Java two times followed by End of the block. The program displays Welcome to Java two times. Save

    Question 2 Under what conditions must a throws clause be added to a method signature Question 2 options: Whenever any unchecked exception that can be thrown by the method is not caught Whenever any checked exception that can be thrown by the method is not caught Whenever any checked exception can be thrown by the method Whenever any exception can be thrown by the method Save

    Question 3 What is displayed on the console when running the following program? public class Quiz2C { public static void main(String args) { try { method(); System.out.println(“After the method call”); } catch (NumberFormatException ex) { System.out.println(“NumberFormatException”); } catch (RuntimeException ex) { System.out.println(“RuntimeException”); } } private static void method() { String s = “8.3”; Integer.parseInt(s); int i = 0; int y = 2 / i; System.out.println(“Welcome to Java”); } }

    Question 3 options: The program displays NumberFormatException The program displays NumberFormatException followed by RuntimeException The program has a compilation error The program displays NumberFormatException followed by After the method call Save

    Question 4 What exceptions will be caught by a catch block that catches exceptions of the class RuntimeException?

    Question 4 options: Exceptions of type RuntimeException and any of its superclasses Exceptions of type RuntimeException and any of its subclasses Any exception Only exceptions of type RuntimeException Save

    Question What exception type does the following program throw? public class Quiz2D { public static void main(String args) { Object object = new Object(); String string = (String) object; } }

    Question 5 options: No exception StringIndexOutOfBoundsException ArithmeticException ClassCastException Save

    Question 6 What is wrong in the following program? public class Quiz2E { public static void main(String args) { try { System.out.println(“Hello world”); } } }

    Question 6 options: A method call that does not declare exceptions cannot be placed inside a try block Nothing is wrong You cannot have a try block without a catch block or a finally block You cannot have a try block without a catch block Save

    Question 7 Select the correct statement regarding the program show below: public class Quiz2G { public static void main(String args) { if (Integer.parseInt(args[0]) == 0) throw new Exception(“Invalid Command Line Argument”); } }

    Question 7 options: The program will not compile because parseInt could throw NumberFormatException and it is never caught The program will not compile because a throws clause is needed The program will compile without any errors The program will not compile because Exception is an unchecked exception Save

    Question 8 The difference between throw and throws is correctly explained by which of the following statements?

    Question 8 options: Either one can be used to throw an exception The two reserved words are interchangeable throw is a reserved word, but throws is not throws is used in a method signature, throw is used to throw an exception Save

    Question 9 What will occur if the catch block in program show below are reversed? class Quiz2H { public static void main(String args) { try { aMethod(); System.out.println(“After the call”); } catch (ArithmeticException exception) { System.out.println(“Arithmetic Exception”); } catch (RuntimeException exception) { System.out.println(“Runtime Exception”); } System.out.println(“After the try-catch statement”); } private static void aMethod() throws RuntimeException { int x = 1/0; } }

    Question 9 options: Only the RuntimeException will be caught The change will have no effect, the program will work the same as before The program will no longer compile Both exceptions will be caught Save

    Question 10 What occurs when an exception is not caught in the current method?

    Question 10 options: The program always terminates and displays an error message The exception is ignored The exception is propagated to the method that called the current method The exception is rethrown Save

    Question 11 Which of the following statements about type compatibility is true?

    Question 11 options: An object of a subclass can be assigned to a reference to its superclass without a type cast Assigning an object of a superclass to a reference to one of its subclasses always causes a compilation error whether type casting is used or not An object of a subclass can be assigned to a reference to its superclass, but type casting is required An object of a superclass can be assigned to a reference to one of its subclasses without casting Save

    Question 12 Which of the following statements about final classes is correct?

    Question 12 options: A final class cannot have any instances A final class cannot be extended A final class cannot have a constructor A final class must have all abstract methods Save

    Question 13 Which of the following expressions evaluates to false? class C1 {} class C2 extends C1 { } class C3 extends C2 { } class C4 extends C1 {} C1 c1 = new C1(); C1 c2 = new C2(); C1 c3 = new C3(); C1 c4 = new C4();

    Question 13 options: c1 instanceof C1 c2 instanceof C1 c4 instanceof C2 c3 instanceof C1 Save

    Question 14 Select the correct statement about interfaces and abstract classes among those shown below.

    Question 14 options: It is possible to create an instance of an abstract class An abstract class cannot have any constructors An abstract class can have ordinary methods but an interface cannot No class can implement more than one interface Save

    Question 15 Which of the following declarations are valid? class Base { … } interface Spec { … } class Derived extends Base implements Spec { }

    Question 15 options: Derived object5 = new Spec(); Derived object2 = new Base(); Spec object3 = new Derived(); Spec object4 = new Base(); Save

    Question 16 Which of the following can contain a constructor?

    Question 16 options: Any abstract class or interface Any nonabstract class or interface Any class or interface Any nonabstract or abstract class Save

    Question 17 What is the output the program shown below. interface A { } class D extends C { } class C { } class B extends D implements A { } public class Quiz2F { public static void main(String args) { B b = new B(); if (b instanceof A) System.out.println(“b is an instance of A”); if (b instanceof C) System.out.println(“b is an instance of C”); } }

    Question 17 options: Nothing b is an instance of C b is an instance of A b is an instance of A followed by b is an instance of C Save

    Question 18 Which of the following class definitions defines a legal abstract class?

    Question 18 options: public class abstract A { abstract void unfinished(); } class A { abstract void unfinished(); } class A { abstract void unfinished() { } } abstract class A { abstract void unfinished(); } Save

    Question 19 Which of the following statements regarding abstract methods is not true?

    Question 19 options: It is possible to declare an abstract class that contains no abstract methods A class that contains abstract methods must be abstract Abstract classes can have constructors A data field can be declared abstract Save

    Question 20 What is true about using the reserved word super?

    Question 20 options: It can only be used in a constructor It can only be used in subclasses It can only be used in superclasses It can only be used in a class that contains an extends clause

    Java:

    Java is a platform-independent language.Java uses a JVM (Java Virtual Machine) that change byte code into machine code. It is an object-oriented language.

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