Java Quiz

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Java Quiz Challenge

Test your Java knowledge with our comprehensive quiz! Designed for both beginners and experienced programmers, this quiz covers a wide range of Java concepts.

Prepare to challenge yourself with questions that include:

Basics of Java classes
String handling
Threads and exceptions
Memory allocation and arrays

16 Questions4 MinutesCreated by CodingNinja542

What is a class in java?

A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

Class is a special data type.

Class is used to allocate memory to a data type.

None of the above.

Given the following code snippet;

int salaries[];

int index = 0;

salaries = new int salaries[4];

while (index < 4)

{ salaries[index] = 10000;

index++;

}

What is the value of salaries [8]?

40000

10000

20000

None of the above.

When a thread terminates its processing, into what state that thread enters?

Dead state

Waiting state

Running state

Beginning state

What all gets printed on the standard output when the class below is compiled and executed by entering "java test lets see what happens".

Select the two correct answers.

public class test

{

public static void main(String args[])

{

System.out.println(args[0]+" "+args.length);

}

a. java

b. test

c. lets

d. 3

e. 4

f. 5

g. 6

A,b

C,d

B,e

C,e

What will be the output of the program?

public class X

{

public static void main(String [] args)

{

try

{ badMethod();

System.out.print("A");

}

catch (RuntimeException ex) /* Line 10 */

{

System.out.print("B");

}

catch (Exception ex1)

{

System.out.print("C");

}

finally

{

System.out.print("D");

}

System.out.print("E");

}

public static void badMethod()

{

throw new RuntimeException();

}

BCD

BDE

What is the result of compiling and running the following program.

public class test

{

public static void main(String args[])

{

String str1="abc";

String str2="def";

String str3=str1.concat(str2);

str1.concat(str2);

System.out.println(str1);

}

Def

Abc

Abcabc

Abcdef

What is the result of compiling and running the following program.

Select the one correct answer.

class test

{

public static void main(String args[])

{

char ch;

String test2 = "abcd";

String test = new String("abcd");

if(test.equals(test2))

{

if(test == test2)

ch = test.charAt(0);

else

ch = test.charAt(1);

}

else

{

if(test == test2)

ch = test.charAt(2);

else

ch = test.charAt(3);

}

System.out.println(ch);

}

'a'

'b'

'c'

'd'

In the following class definition, which is the first line (if any) that causes a compilation error.

Select the one correct answer.

public class test

{

public static void main(String args[])

{

char c;

int I;

c = 'A'; // 1

i = c; //2

c = I + 1; //3

c++; //4

}

The line labeled 1.

The line labeled 2.

The line labeled 3.

All the lines are correct and the program compiles.

What all gets printed when the following gets compiled and run.

Select the two correct answers.

public class test

{

public static void main(String args[])

{

int i=1, j=1;

try

{

i++;

j--;

if(i == j)

i++;

}

catch(ArithmeticException e)

{

System.out.println(0);

}

catch(ArrayIndexOutOfBoundsException e)

{

System.out.println(1);

}

catch(Exception e)

{

System.out.println(2);

}

finally

{

System.out.println(3);

}

System.out.println(4);

}

a. 0

b. 1

c. 2

d. 3

e. 4

A,d,c

B,c,a

D,e

A,b

What is the result of compiling and running the following program.

Select the one correct answer.

class test

{

public static void main(String args[])

{

int[] arr = {1,2,3,4};

call_array(arr[0], arr);

System.out.println(arr[0] + "," + arr[1]);

}

static void call_array(int I, int arr[])

{

arr[i] = 6; I = 5;

}

1,2

5,2

1,6

5,6

By whom and when JAVA was founded ?

James Gosling,1995

James denver,1978

Dan Brown,1954

Seregy brin,1988

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