Java Basic Programming Trivia: Quiz!
.
- 1.
Consider the following code: public class TestOne { public static void main(String args[]) { byte x = 3; byte y = 5; System.out.print((y%x) + ", "); System.out.println(y == ((y/x) *x +(y%x))); } } Which of the following gives the valid output for above?
- A.
Prints 2, false
- B.
Prints: 1, true
- C.
Prints: 2, true
- D.
Prints: 1, true
Correct Answer
C. Prints: 2, true -
- 2.
Consider the following program: class A extends Thread { public A(Runnable r) {} public void run() { System.out.print("A"); } } class B implements Runnable { public void run(){ System.out.print("B"); } } class C{ public static void main(String[] args) { new A(new B()).start(); } } What will be the output of the above program?
- A.
Compiletime Error
- B.
Prints: AB
- C.
Prints: AB
- D.
Prints: A
Correct Answer
D. Prints: A -
- 3.
Dd3)6) Consider the following code: public class Code17 { public static void main(String args[]) { new Code17(); } { System.out.print("Planet "); } { System.out.print("Welcome "); } } Which of the following will be the valid output for the above code?
- A.
Compilation Error
- B.
Planet
- C.
Planet Welcome
- D.
Welcome Planet
Correct Answer
C. Planet Welcome -
- 4.
Polymorphism enables you to:
- A.
Program in the general
- B.
Program in the specific.
- C.
Absorb attributes and behavior from previous classes.
- D.
Hide information from the user.
Correct Answer
A. Program in the general -
- 5.
Polymorphism allows for specifics to be dealt with during:
- A.
Execution.
- B.
Compilation.
- C.
Programming.
- D.
Debugging.
Correct Answer
A. Execution. -
- 6.
A(n) class cannot be instantiated.
- A.
Final.
- B.
Concrete.
- C.
Abstract.
- D.
Polymorphic.
Correct Answer
C. Abstract. -
- 7.
It is a UML convention to denote the name of an abstract class in:
- A.
Bold.
- B.
italics.
- C.
a diamond.
- D.
There is no convention of the UML to denote abstract classes—they are listed just as any other class.
Correct Answer
B. italics. -
- 8.
When a subclass constructor calls its superclass constructor, what happens if the superclass’s constructor does not assign a value to an instance variable?
- A.
A syntax error occurs.
- B.
A compile-time error occurs
- C.
A run-time error occurs.
- D.
The program compiles and runs because the instance variables are initialized to their default values.
Correct Answer
D. The program compiles and runs because the instance variables are initialized to their default values. -
- 9.
Consider the abstract superclass below: public abstract class Foo { private int a; public int b; public Foo( int aVal, int bVal ) { a = aVal; b = bVal; } // end Foo constructor public abstract int calculate(); } // end class Foo Any concrete subclass that extends class Foo:
- A.
Must implement a method called calculate.
- B.
Will not be able to access the instance variable a.
- C.
Neither (a) nor (b).
- D.
Both (a) and (b)
Correct Answer
D. Both (a) and (b) -
- 10.
Every object in Java knows its own class and can access this information through method
- A.
GetClass.
- B.
GetInformation.
- C.
ObjectClass.
- D.
ObjectInformation
Correct Answer
A. GetClass. -
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Current Version
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Mar 21, 2022Quiz Edited by
ProProfs Editorial Team -
Aug 21, 2015Quiz Created by
Raj_Kumar505
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