Java Programming Questions and Answers

Showing 121 - 130 of 150 questions

121

Consider the following piece of code:

float lu luckyNumber = 1.25;

System.out.println ( "The value of luckyNumber: " + luckyNumber );

What is the result?

A. The value of lucky number::

B. The value of lucky number: 1.25

C. The code would not compile

D. The code will compile but will give a runtime error.

correct answer c

122

Look this code:

1. class CodeWalkOne {

2. public static void main(String [] args) {

3. int [] counts = {1,2,3,4,5};

4. counts[1] = (counts[2] == 2) ? counts[3] : 99;

5. System.out.println(counts[1]);

6. }

7. }

What is the result?

A. Compilation fails on line 4.

B. 3

C. 4

D. 99

correct answer d

123

Consider the following code fragment:

1. public class Question{

2. public static void main(String[] args) {

3. byte x = 21;

4. byte y = 13;

5. int z = x^y;

6. System.out.println(z);

7. }

8. }

What is the result of this code fragment?

A. 24

B. 29

C. 21

D. A compiler error occurs at line 5.

correct answer a

124

Which of the following expressions is legal?

A. int x=9;

B. int y=!x;

C. double z=9.00>>2;

D. int i=^7;

correct answer a

125

Which of the following statements would not produce the compile error?

A. char my_char='c';

B. char your_char='int';

C. char what='hello';

D. char what_char="L";

correct answer a

126

Which of the following statements would not produce the compile error?

A. char my_char='c';

B. char your_char='int';

C. char what='hello';

D. char what_char="L";

correct answer a

127

Which method is used to perform interthread communications?

A. yield ( )

B. sleep (..)

C. notify ( )

D. wait ( )

correct answer a

128

Which of the following methods is not defined in the Thread class?

A. yield ( )

B. sleep (..)

C. run ( )

D. wait ( )

correct answer d

129

What would happen when a thread executes the following statement in its run() method?

sleep(500);

A. It is going to stop execution and restart execution exactly after 500 milliseconds.

B. It is going to stop execution and restart execution not earlier than 500 milliseconds.

C. It will result in compiler error because sleep ( ) method cannot be called inside run ( ) method.

D. It will result in compiler error because the sleep ( ) method does not take any argument.

correct answer b

130

Consider the following code fragment:

1. public class ThreadTest {

2. public static void main(String[] args) {

3. Counter ct = new Counter();

4. ct.start();

5. System.out.println("The thread has been started");

6. }

7. }

8. class Counter extends Thread {

9. protected void run() {

10. System.out.println("Hello");

11. }

12. }

What would be the output of this code fragment?

A. The thread has been started.

Hello

B. Hello

The thread has been started.

C. Either A or B

D. Compiler error on line 9

correct answer d

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