Java MCQs with answers Page - 230

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Q. Which of this package is used for all the text related modifications?

  • (A) java.text
  • (B) java.awt
  • (C) java.lang.text
  • (D) java.text.mofify

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Q. 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) ---
  • (D) ---

A

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Q. Which of these can be overloaded?

  • (A) Methods
  • (B) Constructors
  • (C) Both a & b
  • (D) None of the mentioned

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Q. Which of the following statements are incorrect?

  • (A) Default constructor is called at the time of declaration of the object if a constructor has not been defined.
  • (B) Constructor can be parameterized.
  • (C) ---
  • (D) ---

A

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Q. 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) ---
  • (D) ---

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Q. If a thread is to be declared as a daemon thread, it must be declared before

  • (A) start method
  • (B) run method
  • (C) stop method
  • (D) none

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Q. Consider the following program: 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 1.

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Q. Consider the following code snippet String river = new String(“Columbia”); System.out.println(river.length()); What is printed?

  • (A) 6
  • (B) 7
  • (C) 8
  • (D) Columbia

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Q. Consider 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) none of these above

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Q. In Java Inheritance

  • (A) all fields of a class are private
  • (B) all fields of a class are protected
  • (C) a new class is derived from an existing class
  • (D) The program throws an exception and proceeds to execute the finally block.

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