Quiz | Croma Campus

Which method is used to read a single character in Java?

read()
readChar()
readLine()
readCharacter()

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Which of the following is not a valid declaration of a String?

String s1 = null;
String s2 = "null";
String s3 = (String) "abc";
String s4 = 'abc';

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Which method is the entry point of a Java program?

start()
main()
run()
init()

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Which of the following is used to find and fix bugs in Java programs?

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What is the extension of compiled Java classes?

.txt
.class
.js
.java

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Which method is used to start a thread execution in Java?

init()
start()
run()
resume()

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Which of these is not a type of inheritance in Java?

Single inheritance
Multiple inheritance
Multilevel inheritance
Hierarchical inheritance

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Which of these can be used to create a thread in Java?

Extending the Runnable interface
Implementing the Thread class
Both a and b
Neither a nor b

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Which of these is a valid declaration of a char?

char ch = 'ab';
char ch = 'a';
char ch = 'a'';
char ch = a;

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Which of these is a marker interface?

Runnable
Serializable
Comparable
Cloneable

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Which of the following is not an OOPS concept in Java?

Inheritance
Encapsulation
Polymorphism
Compilation

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Which of these methods is used to compare two strings, ignoring case differences?

equals()
equalsIgnoreCase()
compare()
compareTo()

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Which of these keywords is used to handle exceptions in Java?

try
catch
finally
all of the mentioned

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What is the use of the 'this' keyword in Java?

To refer to the current object
To refer to the parent class object
To refer to the child class object
To refer to the object of the same class

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Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

java.util.HashSet
java.util.LinkedHashSet
java.util.List
java.util.ArrayList

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What is the default value of byte variable in Java?

0
0
null
undefined

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Which keyword is used to prevent inheritance of a class in Java?

final
finally
finalize
static

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Which of these methods is used to obtain an iterator for a collection?

iterator()
iterate()
listIterator()
list()

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Which exception is thrown when an array is accessed with an illegal index?

ArrayIndexException
ArrayException
ArrayStoreException
ArrayIndexOutOfBoundsException

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Which of the following is not a Java feature?

Dynamic
Architecture Neutral
Use of pointers
Object-oriented

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Which of the following cannot be stored in a Collection?

Objects
Primitive data types
Arrays
User-defined classes

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What is the result of the expression 13 & 25?

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Which of these methods is a part of the Abstract class?

main()
abstract()
run()
None of the mentioned

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Which of these is not a valid identifier in Java?

_abc
$abc
abc123
123abc

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Which of these is an interface in Java?

Runnable
RunnableThread
SerializableThread
SerializableRun

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Which method is called by the garbage collector in Java?

finalize()
final()
finally()
all of the mentioned

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Which of these methods is used to remove all elements from a collection?

clear()
removeAll()
delete()
deleteAll()

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Which of these operators can be used to concatenate two or more String objects?

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Which method is used to add elements to a collection?

add()
append()
insert()
push()

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Which of these classes is used to read character data in Java?

FileInputStream
FileOutputStream
FileReader
FileWriter

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