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
- 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
- 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
- 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.
- 5.Polymorphism allows for specifics to be dealt with during:
- A.
Execution.
- B.
Compilation.
- C.
Programming.
- D.
Debugging.
- 6.A(n) class cannot be instantiated.
- A.
Final.
- B.
Concrete.
- C.
Abstract.
- D.
Polymorphic.
- 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.
- 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.
- 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)
- 10.Every object in Java knows its own class and can access this information through method
- A.
GetClass.
- B.
GetInformation.
- C.
ObjectClass.
- D.
ObjectInformation
Questions: 20 | Attempts: 6515 | Last updated: May 24, 2021
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