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Java Masterclass for Software Developers

Practice Challenges for Fun

Explore practical Java challenges to improve your understanding of repetition and loops. Learn to change loop directions, count words, detect palindromes, and calculate factorials with while loops through hands-on coding problems.

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Quiz

Attempt the following quiz questions:

1.

What are the four steps of a typical while loop? Which steps are repeated?

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Challenge 1: Change the direction of a counted loop

1.

Revise the following while loop so that count decrements, but sum has the same value at the end of the loop as it does in the original loop.

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Java
public class Challenge1
{
   public static void main( String args[] )
   {
      int sum = 0;
      int count = 0;
      while (count < 5)
      {
         sum = sum + count;
         count = count + 1;
      }  // End while
      System.out.println(sum);
   } // End main
} // End Challenge1

Challenge 2: Count words in a sentence

1.

Using the String method charAt, write a loop that counts the number of words in the string sentence. You can make the following assumptions:

  • Words are separated by exactly one blank character
  • The string begins and ends with a non-blank character
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Java
public class Challenge2
{
   public static void main( String args[] )
   {
      String sentence = "A sample sentence for you to try.";
 
 
      int numberOfWords = 0; // STUB
      System.out.println("The sentence \"" + sentence + '\"');
      System.out.println("has " + numberOfWords + " words.");
   } // End main
} // End Challenge2

Challenge 3: Read and

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