1. If you haven’t completed the Boolean exercise, do so now. Open BooleanSingle.java in an editor and add the following javadoc comments.

/**
 * An example of using a boolean method.
 * @author James A. Brannan
 * @version 1.0
 *
*/
public class BooleanSingle{
  /**
   * Tests if x is a single digit.
   * @param x the integer to test
   * @return true if x is single digit, false otherwise
   */
  public static boolean isSingleDigit(int x){
    if (x > -10 && x < 10){
      return true;
    }
    else {
      return false;
    }
  }
  public static void main(String[] args){
    boolean isSingleOne = BooleanSingle.isSingleDigit(4);
    boolean isSingleTwo = isSingleDigit(22);
    System.out.println("is 4 single digit: " + isSingleOne);
    System.out.println("is 22 single digit: " + isSingleTwo);
  }
}

2. In your current working directory, create a subdirectory named documentation
3. Execute the javadoc command, specifying the output directory as documentation

$ javadoc BooleanSingle.java -d documentation
Loading source file BooleanSingle.java...
Constructing Javadoc information...
Standard Doclet version 1.8.0_60
Building tree for all the packages and classes...
Generating documentation/BooleanSingle.html...
Generating documentation/package-frame.html...
Generating documentation/package-summary.html...
Generating documentation/package-tree.html...
Generating documentation/constant-values.html...
Building index for all the packages and classes...
Generating documentation/overview-tree.html...
Generating documentation/index-all.html...
Generating documentation/deprecated-list.html...
Building index for all classes...
Generating documentation/allclasses-frame.html...
Generating documentation/allclasses-noframe.html...
Generating documentation/index.html...
Generating documentation/help-doc.html...

4. Open your browser and open index.html and you should see the generated java documentation.