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- 1. Multiple-choice30 seconds1 pt
Who invented Java?
Ryan Gosling
Bjarne Stroustrup
James Gosling
Guido van Rossum
- 2. Multiple-choice30 seconds1 pt
Is String a primitive data type?
Yes
No
Both
- 3. Multiple-choice30 seconds1 pt
Which method to use to find length of a string?
length()
size()
long()
count()
- 4. Multiple-choice1 minute1 pt
String x = "10";
String y = "20";
String z = x + y;
System.out.println(z);
Guess the output.
1020
10 20
30
"10 20"
- 5. Multiple-choice1 minute1 pt
Choose most appropriate purpose of trim() method in String?
to remove white spaces
to get a substring of the string
to cut String at desired index
to remove extra white spaces from start and end of String
- 6. Multiple-choice1 minute1 pt
What is the most appropriate way to check if two Strings are identical?
string1 == string2
string1.equals(string2)
string1.same(string2)
string1.equalsIgnorecase(string2)
- 7. Multiple-choice30 seconds1 pt
int[] myArray = {11, 22, 33, 44, 55};
which code is correct to print length of above int-array?
System.out.println(int[].myArray.length());
System.out.println(myArray.length);
System.out.println(myArray.length());
System.out.println(int[].myArray.size());
- 8. Multiple-choice30 seconds1 pt
Java was originally named:
Coffee
Oak
New C++
Duke
- 9. Multiple-choice20 seconds1 pt
What is the output?
int array[][] ={{9001, 2000, 1243), {77, 88, 99, 111}};
System.out.println(array[1][3]);
1243
99
111
Index out of bounds error
- 10. Multiple-choice20 seconds1 pt
Multiple inheritance allows a class to inherit characteristics and features from more than one abstract parent class. This allows a subclass to extend more than one superclass, in order to use the methods of each. Java supports multiple inheritance.
True
False
- 11. Multiple-choice30 seconds1 pt
This is a general structure a method.
<Returnvalue type> <Method Name> (argument / s)
<Modifier> < type> <Method Name> (parameter / s)
public static void main (String[ ] args)
<Method Name> (parameter)
- 12. Multiple-choice30 seconds1 pt
The difference between static and non static method is ....
for non static method : user need to create object in a class to call a method.
A method is to perform only specific task.
There is no significant differences between static and non - static method.
Both are bounded with a class.
- 13. Multiple-choice30 seconds1 pt
Explain JDK
It stands for Java Development Kit
It is the tool necessary to compile, document and package Java programs
None of the above
Both 1 and 2
- 14. Multiple-choice30 seconds1 pt
What is JVM
It stands for Java Virtual Machine
It is an abstract machine. It is specification that provides run-time environment in which java bytecode can be executed
None of the above
Both 1 and 2
- 15. Multiple-choice30 seconds1 pt
public is an
access modifier
keyword
return type
method
- 16. Multiple-choice30 seconds1 pt
constructors has no return type in Java
True
False
- 17. Multiple-choice30 seconds1 pt
Which of the following is available both in C++ and Java?
friend
try-catch-finally
interface
multiple inheritance
public inheritance
- 18. Multiple-choice30 seconds1 pt
Which of the following access modifiers makes the member accessible from a class in the same package?
private
protected
public
default
- 19. Multiple-choice30 seconds1 pt
Assuming Point is a valid class, what would be the result of this code: Point p[] = new Point[10]; System.out.println(p[3].getX());
0
Null Pointer Exception
-999
Index Out of Bound Error
- 20. Multiple-choice30 seconds1 pt
Which are true about String?
is a primitive type
is a class
is immutable
can be instantiated without using constructors
