Java Programming Quiz

What does it mean that Java is platform-independent?

• Java can run on any operating system without modification.

• Java can only run on Windows.

• Java applications require special hardware.

• Java cannot be used for web applications.

What will be the output of the following code:

int x = 5;

double y = x;

System.out.println(y);?

• 5

• 5.0

• 5.5

• Error

What will be the output of the following code:

double x = 5.5;

int y = (int)x;

System.out.println(y);?

• 6

• 5.5

• 5

• Error

What is the output of the following code:

String s = "Hello";

s = s.concat(" World");

System.out.println(s);?

• Hello

• World

• Error

• Hello World

What is the output of the following code?

int x = 10;

if (x > 5) {

System.out.println("Greater than 5");

} else {

System.out.println("Less than or equal to 5");

}

• Greater than 5

• Less than or equal to 5

• Error

• No output

What method of the Scanner class is used to read an integer from the user?

• nextLine()

• next()

• nextInt()

• nextDouble()

How do you declare a two-dimensional array of integers in Java?

• int[][] array;

• int array[][];

• Both A and B

• None of the above

Which loop guarantees that the block of code will execute at least once?

• for loop

• while loop

• do-while loop

• None of the above

Which of the following is thread-safe?

• String

• StringBuilder

• StringBuffer

• None of the above

How do you declare a one-dimensional array of integers in Java?

• int[] array;

• int array[];

• Both A and B

• None of the above