JAVA Test on P6

This article presents JAVA Test on P6 in a clear, structured format. It helps readers review key concepts, test their understanding, and learn from the material.

Understanding JAVA Test on P6

• Question 1. Which line is wrong?

  1. int i = 0;
  
  2. due to {
  
  3. i + = 1;
  
  4.} while (i == 0);
  
  5. System.out.println ('i =' + i);

  • first
  • 2 and 3
  • 4
  • No wrong lines
• Question 2. s is the result of how much when executing the command block?

  int i = 0;
  
  int s = 0;
  
  for (;;) {
  
  if i == 3 break;
  
  s = s + i;
  
  i ++;
  
  }

  • 6
  • 3
  • Program reported an error
  • 0
• Question 3. In what line is the program wrong?

  1. int i = 0;
  
  2. int s = 0;
  
  3. for (;;) {
  
  4. if i == 3 break;
  
  5. s = s + i;
  
  6. i ++;
  
  7.}

  • 1 and 2
  • 4
  • 6
  • No wrong lines
• Question 4. What is the result of the program?

  BreakDemo class {
  
  public static void main (String [] args) {.
  
  int [] arrayOfInts = {32, 87, 3, 589, 12, 1076, 2000, 8, 622, 127};
  
  int searchFor = 12;
  
  int i;
  
  boolean fountIt = false;
  
  for (i = 0; i
  if (arrayOfInts [i] == searchFor) {
  
  fountIt = true;
  
  break;
  
  }
  
  }
  
  if (fountIt) {
  
  System.out.println ('Found' + searchFor + 'at index' + i);
  
  } else
  
  System.out.println (searchFor + 'not in the array');
  
  }
  
  }

  • 12 không ph?i trong m?ng
  • Found 12 at index 4
  • Program error
  • 1. Found it
• Question 5. Which line is wrong?

  1. BreakDemo class {
  
  2. public static void main (String [] args) {.
  
  3. int [] arrayOfInts = {32, 87, 3, 589, 12, 1076, 2000, 8, 622, 127};
  
  4. int searchFor = 12;
  
  5. int i;
  
  6. boolean fountIt = false;
  
  7. for (i = 0; i
  8. if (arrayOfInts [i] == searchFor) {
  
  9. fountIt = true;
  
  10. break;
  
  11.}
  
  twelfth. }
  
  13. if (fountIt) {
  
  14. System.out.println ('Found' + searchFor + 'at index' + i);
  
  15.} else
  
  16. System.out.println (searchFor + 'not in the array');
  
  17.}
  
  18.}

  • 2 and 6
  • 1. 3 and 11, 15
  • 1. 5, 7, 9
  • No programs are wrong
• Question 6. What does the program do?

  BreakDemo class {
  public static void main (String [] args) {.
  int [] arrayOfInts = {32, 87, 3, 589, 12, 1076, 2000, 8, 622, 127};
  int searchFor = 12;
  int i;
  boolean fountIt = false;
  for (i = 0; iif (arrayOfInts [i] == searchFor) {
  fountIt = true;
  break;
  }
  }
  if (fountIt) {
  System.out.println ('Found' + searchFor + 'at index' + i);
  } else
  System.out.println (searchFor + 'not in the array');
  }
  }

  • Find an element in the array
  • 1. Compare array elements together.
  • Calculate the total array.
  • All answers are wrong
• Question 7. What does the following program do?

  class ContinueDemo {
  
  public static void main (String [] args) {.
  
  String searchMe = 'peter piper picked up a peck of pickled peppers';
  
  int max = searchMe.length ();
  
  int numPs = 0;
  
  for (int i = 0; i
  if (searchMe.charAt (i)! = 'p') continue;
  
  numPs ++;
  
  }
  
  System.out.println ('Found' + numPs + 'p's in the string.');
  
  }
  
  }

  • Count the letter p in the character string.
  • Find out if the p is in front of the letter i in the string.
  • Search for letter p in the string
  • All is wrong
• Question 8. What is the result of the following program?

  class ContinueDemo {
  
  public static void main (String [] args) {.
  
  String searchMe = 'peter piper picked up a peck of pickled peppers';
  
  int max = searchMe.length ();
  
  int numPs = 0;
  
  for (int i = 0; i
  if (searchMe.charAt (i)! = 'p')
  
  ti?p t?c;
  
  numPs ++;
  
  }
  
  System.out.println ('Found' + numPs + 'p's in the string.');
  
  }
  
  }

  • 1. Found 9 p's in the string.
  • Found 8 p's in the string.
  • Found 10 p's in the string.
  • There is no right answer.
• Question 9. What is the result of the following program?

  class ContinueDemo {
  
  public static void main (String [] args) {.
  
  String searchMe = 'peter piper picked up a peck of pickled pepers';
  
  int max = searchMe.length ();
  
  int numPs = 0;
  
  for (int i = 0; i
  if (searchMe.charAt (i)! = 'p')
  
  ti?p t?c;
  
  numPs ++;
  
  }
  
  System.out.println ('Found' + numPs + 'p's in the string.');
  
  }
  
  }

  • Found 9 p's in the string.
  • Found 8 p's in the string.
  • Found 10 p's in the string.
  • There is no right answer.
• Question 10. Which method of the String class returns the index of the child string that appears first in the char character string '.
  • concat ()
  • charAt ()
  • indexOf ()
  • There is no right answer.