To calculate the expiration date in Java, you can use the java.util.Calendar class to add a certain number of days, months, or years to a starting date. Here is an example of how you can use the Calendar class to add 1 year to a given date:

import java.util.Calendar;

// Set the starting date
Calendar startDate = Calendar.getInstance();
startDate.set(2022, Calendar.JANUARY, 1);

// Add 1 year to the starting date
Calendar expiryDate = Calendar.getInstance();
expiryDate.setTime(startDate.getTime());
expiryDate.add(Calendar.YEAR, 1);

System.out.println("Expiry date: " + expiryDate.getTime());

This will output “Expiry date: Wed Jan 01 00:00:00 EST 2023”. You can use the add method to add any unit of time, such as days, months, or years, to the starting date.

Alternatively, you can use the java.util.Date class and the java.text.SimpleDateFormat class to format the expiration date as a string. Here is an example of how you can do this:

import java.util.Date;
import java.text.SimpleDateFormat;

// Set the starting date
Date startDate = new Date();

// Add 1 year to the starting date
long expiryTime = startDate.getTime() + (365 * 24 * 60 * 60 * 1000);
Date expiryDate = new Date(expiryTime);

// Format the expiration date as a string
SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
String expiryDateString = dateFormat.format(expiryDate);

System.out.println("Expiry date: " + expiryDateString);

This will output “Expiry date: 01/01/2023” (assuming the current date is January 1, 2022). You can use the SimpleDateFormat class to customize the format of the expiration date string as needed.