Assertions Questions and Answers
Assertions
Showing 10 of
45 questions
1. What will be the output of the program?
public class Test
{
public static void main(String[] args)
{
int x = 0;
assert (x > 0) ? "assertion failed" : "assertion passed" ;
System.out.println("finished");
}
}
- finished
- Compiliation fails.
- An AssertionError is thrown and finished is output.
- An AssertionError is thrown with the message "assertion failed."
2. public class Test
{
public void foo()
{
assert false; /* Line 5 */
assert false; /* Line 6 */
}
public void bar()
{
while(true)
{
assert false; /* Line 12 */
}
assert false; /* Line 14 */
}
}
What causes compilation to fail?
- Line 5
- Line 6
- Line 12
- Line 14
3. What will be the output of the program?
public class Test
{
public static int y;
public static void foo(int x)
{
System.out.print("foo ");
y = x;
}
public static int bar(int z)
{
System.out.print("bar ");
return y = z;
}
public static void main(String [] args )
{
int t = 0;
assert t > 0 : bar(7);
assert t > 1 : foo(8); /* Line 18 */
System.out.println("done ");
}
}
- bar
- bar done
- foo done
- Compilation fails
4. What will be the output of the program (when you run with the -ea option) ?
public class Test
{
public static void main(String[] args)
{
int x = 0;
assert (x > 0) : "assertion failed"; /* Line 6 */
System.out.println("finished");
}
}
- finished
- Compilation fails.
- An AssertionError is thrown.
- An AssertionError is thrown and finished is output.
5. public class Test2
{
public static int x;
public static int foo(int y)
{
return y * 2;
}
public static void main(String [] args)
{
int z = 5;
assert z > 0; /* Line 11 */
assert z > 2: foo(z); /* Line 12 */
if ( z < 7 )
assert z > 4; /* Line 14 */
switch (z)
{
case 4: System.out.println("4 ");
case 5: System.out.println("5 ");
default: assert z < 10;
}
if ( z < 10 )
assert z > 4: z++; /* Line 22 */
System.out.println(z);
}
}
which line is an example of an inappropriate use of assertions?
- Line 11
- Line 12
- Line 14
- Line 22
6. What is the primary purpose of assertions in Java?
- To handle runtime exceptions
- To improve code performance
- To validate assumptions during development
- To replace exception handling
7. Which keyword is used to declare an assertion in Java?
- assertion
- assert
- Assert
- validate
8. What happens by default when an assertion fails at runtime?
- Compilation error occurs
- AssertionError is thrown
- NullPointerException is thrown
- Program continues execution silently
9. How are assertions enabled at runtime?
- Using -enableassertions or -ea
- Using -enableassertions=true in code
- They are always enabled by default
- Using @EnableAssertions annotation
10. Which of the following is the correct syntax for assert statement?
- assert condition;
- assert(condition);
- Assert condition;
- assert condition : message;