TransitPass.java fileThis is a inheritance question, I have to comeplete the missing method, the API link is: https://www.eecs.yorku.ca/course_archive/2017-18/W/2030Z/practice_tests/test3X/doc/test3/PrepaidPass.html, I attached PrepaidPass.java file and TransitPass.java file below:

PrepaidPass.java file:

import java.util.Date;

/** * A transit pass that holds a prepaid amount of value. * Every prepaid pass has a balance that is greater than or * equal to zero. * */ public class PrepaidPass extends TransitPass {

private int balance; /** * Initialize this pass so that its expiry date is * equal to the given expiry date and its balance is equal * to the given balance. * * @param expiryDate the expiry date for this pass * @param balance the balance for this pass * @throws IllegalArgumentException if balance is negative or zero */ public PrepaidPass(Date expiryDate, int balance) {

} /** * Returns the balance of this pass. * * @return the balance of this pass */ public int getBalance() { } /** * Adds the given amount to the balance of this pass. * * @param amount an amount of value to add to the balance of this pass * @pre. amount > 0 */ public void add(int amount) { } /** * Returns true if this pass is valid for the given * date and fare. A pass is valid if its expiry date is * after the given date and if its balance is greater than * or equal to the fare amount. * * @param date the date of the trip * @param fare the fare amount for the trip * @return true if this transit pass is valid for the given * trip date and fare amount, and false otherwise * @pre. fare > 0 */ @Override public boolean isValid(Date date, int fare) { }

/** * Use this pass to pay for a trip on the given * date and fare amount, and increment the number of times * that this pass has been used. The fare amount is deducted from * the balance of this pass. * * @param date the date of the trip * @param fare the fare amount for the trip * @throws RuntimeException if the pass is not * valid for the given trip date and fare amount * @pre. fare > 0 */ @Override public void payFare(Date date, int fare) { }

}

TransitPass.java file:

import java.util.Date;

/** * The parent class for different kinds of passes used to * pay fares on a transit system. Every pass has an expiry * date that can only be modified by using the setExpiryDate * method. Every pass counts the number of times that it * has been used to pay a fare. * */ public abstract class TransitPass { private int timesUsed; private Date expiry; /** * Initialize this transit pass so that its expiry date is * equal to the given expiry date. * * @param expiryDate the expiry date for this transit pass */ public TransitPass(Date expiryDate) { this.timesUsed = 0; this.setExpiryDate(expiryDate); } /** * Returns a copy of the expiry date for this transit pass. * * @return a copy of the expiry date for this transit pass */ public final Date getExpiryDate() { return new Date(this.expiry.getTime()); } /** * Sets the expiry date for this transit pass to the given * date. * * @param expiryDate the expiry date for this transit pass */ public final void setExpiryDate(Date expiryDate) { this.expiry = new Date(expiryDate.getTime()); } /** * Returns the number of times this pass has been used to * pay a fare. * * @return the number of times this pass has been used to * pay a fare */ public final int getTimesUsed() { return this.timesUsed; } /** * Returns true if this transit pass is valid for the given * date and fare. A pass is valid if its expiry date is * after the given date and if it can be used to pay * the given fare amount. * * @param date the date of the trip * @param fare the fare amount for the trip * @return true if this transit pass is valid for the given * trip date and fare amount, and false otherwise * @pre. fare > 0 */ public abstract boolean isValid(Date date, int fare); /** * Use this transit pass to pay for a trip on the given * date and fare amount, and increment the number of times * that this pass has been used. * * @param date the date of the trip * @param fare the fare amount for the trip * @throws RuntimeException if the transit pass is not * valid for the given trip date and fare amount * @pre. fare > 0 */ public void payFare(Date date, int fare) { this.timesUsed++; } }