Below is the syntax highlighted version of LeapYear.java from §1.2 Built-in Types of Data.

/*************************************************************************

 *  Compilation:  javac LeapYear.java

 *  Execution:    java LeapYear N

 *  

 *  Prints true if N corresponds to a leap year, and false otherwise.

 *  Assumes N >= 1582, corresponding to a year in the Gregorian calendar.

 *

 *  % java LeapYear 2004

 *  true

 *

 *  % java LeapYear 1900

 *  false

 *

 *  % java LeapYear 2000

 *  true

 *

 *************************************************************************/

public class LeapYear { 

    public static void main(String[] args) { 

        int year = Integer.parseInt(args[0]);

        boolean isLeapYear;

        // divisible by 4

        isLeapYear = (year % 4 == 0);

        // divisible by 4 and not 100

        isLeapYear = isLeapYear && (year % 100 != 0);

        // divisible by 4 and not 100 unless divisible by 400

        isLeapYear = isLeapYear || (year % 400 == 0);

        System.out.println(isLeapYear);

    }

}