Java quiz 12: Conditional statements

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Here we have a sequence of conditional statements.

Java quiz 12: A sequence of conditional statements

Level: Normal

What is written to the standard output as the result of executing the following code?

public class Condition
{
  public static void main(String[] args)
  {
    int x = 2;
    String str = "";
    boolean isActive = false;
    if(!isActive)
    {
      str += x;
      x += 3;
      System.out.print(str);
      isActive = true;
    }
    if(isActive)
    {
      str += x;
      System.out.print(str);
    }
  }
}
  Author: Sar Maroof

Select the correct answer.


Answer explanation

  1. The condition if(!isActive) returns true, because the boolean variable isActive is false.
  2. The statement str += x; adds a string value of x to the object str, which is 2.
  3. The statement x += 3; increments the value of x by 3. So, x = 2 + 3 = 5.
  4. The statement System.out.print(str); writes 2 to the standard output.
  5. The statement isActive = true; reassigns the value true to the boolean variable isActive. Therefore the the statement if(isActive) returns true.
  6. The statement str += x; adds the string value of x which is 5 to the initial value of str which is 2.
  7. The statement System.out.print(str); prints the value the string value of str which is 25 to the standard output.
  8. Don’t forget that in the first block the value of str is also writtento the standard output.
  9. The program writes 225 to the standard output.

The correct answer is: f.

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Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer.

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