Question 1

How long does the following code run? for(int x=0; x=3; x++)

Never
Three times
Forever
Error

Answer

Correct Option: C

Question 2

Any class that implements the Runnable interface has to provide the implementation for the following methods public void start(); public void run();

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True
False

Answer

Correct Option: A

Question 3

What is the result of trying to compile and run the following code. public final static void main(String[] args){ double d = 10.0 / -0; if(d == Double.POSITIVE_INFINITY) System.out.println("Positive infinity"); else System.out.println("Negative infinity"); }

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output Positive infinity
output Negative infinity
Will fail to compile
Runtime exception

Answer

Correct Option: A

Question 4

What is the result that will be printed out ? void aMethod() { float f = (1 / 4) * 10; int i = Math.round(f); System.out.println(i); }

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2
0
3
2.5

Answer

Correct Option: B

Question 5

What is the result that will be printed out ? void aMethod() { float f = (1 / 4) * 10; int i = Math.round(f); System.out.println(i); }

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Compiler error.
Compiles and runs printing out 2
Compiles and runs printing out 1
An ArrayIndexOutOfBounds Exception at runtime

Answer

Correct Option: B

Question 6

What will happen if you try to compile and run this ? public class Test{ static{ print(10); } static void print(int x){ System.out.println(x); System.exit(0); } }

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. Compiler error.
Will throw a NoSuchMethod error at runtime.
It will compile and run printing out "10"
It will run with no output.

Answer

Correct Option: B

Question 7

What is the value of d that will be printed out. public class Test { public final static void main(String[] args) { double d = - 22.22222; System.out.println(Math.ceil(d)); } }

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-23
-22.0
22.0
24

Answer

Correct Option: B

Question 8

ZZZ (Duplicate) - Identify whether the following statement is true or false. The finally block is executed when an exception is thrown, even if no catch matches it.

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True
False

Answer

Correct Option: A

Question 9

ZZZ (Duplicate) - What is the output of the following, StringBuffer sb1 = new StringBuffer("Debopam"); StringBuffer sb2= new StringBuffer("Debopam "); String ss1 = " Debopam "; System.out.println(sb1==sb2); System.out.println(sb1.equals(sb2)); System.out.println(sb1.equals(ss1)); System.out.println("Poddar".substring(3));

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false false false dar
false true false Poddar
Compiler Error
true true FALSE dar

Answer

Correct Option: A

Question 10

Identify whether the following statement is true or false.
The keyword synchronized can be used with only a method

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True
False

Answer

Correct Option: A

Question 11

Identify whether the following statement is true or false.
The run () method should necessary exist in classes created as subclass of Thread

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True
False

Answer

Correct Option: A

Question 12

What is the purpose of the toolkit in the Abstract Window Toolkit (AWT)?

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To repair broken frames
To create custom components
An interface between the abstract window layer and windowing implementation
To facilitate multicolor printing

Answer

Correct Option: C

Question 13

What is an interface class?

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A collection of method declarations and constant values
An abstract base class
A way to get multiple inheritance
A way to inherit variables and method implementations

Answer

Correct Option: A

Question 14

Vertical and horizontal scroll bar increments are how many units by default?

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12.5 units
100 units
5 units
1 unit

Answer

Correct Option: D

Question 15

Reflection (introspection) is querying a class about its properties, and operating on methods and fields by the name for a given object instance. Why is reflection possible in the Java language?

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Late binding
Early binding
Java developers are very introspective people
Reflection is possible in all languages

Answer

Correct Option: A

Question 16

The StringBuffer class supports what type of strings?

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Mutable (changeable)
Immutable (unchangeable)
Violins and cellos
Rotated and scaled

Answer

Correct Option: A

Question 17

Why does an Assert class that checks program assertions need several implementations of its assert method?

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The Java language has loose type checking
The Java language has tight type checking
To keep tabs on garbage collection
You never know how many you need, so you should always cover the most obvious cases

Answer

Correct Option: B

Question 18

Handling an exception allows a program to terminate execution

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True
False

Answer

Correct Option: B

Question 19

Java's exception handling mechanism keeps error-processing code in the main line of a program's code to improve program clarity.

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True
False

Answer

Correct Option: B

Question 20

Identify the correct examples of Exception

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Divide by zero error
Accessing the elements of an array beyond its range
Invalid input
Opening an empty file
Hard disk crash

Answer

Correct Option: A,B,C,E

Description: programming languages Online Quiz - 209
Number of Questions: 20
Created by: Aliensbrain Bot
Tags: programming languages

programming languages Online Quiz - 209

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