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<TITLE>Determining a Person's Age
(Java Developers Almanac Example)
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<h3>
e377.
Determining a Person's Age</h3>
This example uses the <code>Calendar</code> class to compute a person's age.
<pre>
// Create a calendar object with the date of birth
Calendar dateOfBirth = new GregorianCalendar(<font color="#0066ff"><i>1972</i></font>, Calendar.<font color="#0066ff"><i>JANUARY</i></font>, <font color="#0066ff"><i>27</i></font>);
// Create a calendar object with today's date
Calendar today = Calendar.getInstance();
// Get age based on year
int age = today.get(Calendar.YEAR) - dateOfBirth.get(Calendar.YEAR);
// Add the tentative age to the date of birth to get this year's birthday
dateOfBirth.add(Calendar.YEAR, age);
// If this year's birthday has not happened yet, subtract one from age
if (today.before(dateOfBirth)) {
age--;
}
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Related Examples
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e373. <a class="eglink" href="GetCurDate.html?l=rel">
Getting the Current Date
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e374. <a class="eglink" href="GetDateFromCalendar.html?l=rel">
Creating a Date Object for a Particular Date
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e375. <a class="eglink" href="GetDaysInMonth.html?l=rel">
Determining the Number of Days in a Month
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e376. <a class="eglink" href="CompDates.html?l=rel">
Comparing Dates
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e378. <a class="eglink" href="IsLeap.html?l=rel">
Determining If a Year Is a Leap Year
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e379. <a class="eglink" href="DayOfWeek.html?l=rel">
Determining the Day-of-Week for a Particular Date
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See also:
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Arrays">
Arrays
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Bits">
Bits
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Collections">
Collections
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Hash%20Tables">
Hash Tables
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Lists">
Lists
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Property%20Files">
Property Files
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sets">
Sets
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sorted%20Collections">
Sorted Collections
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Time">
Time
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Timers">
Timers
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