Time.java

// Public class with exposed immutable fields - questionable
package org.effectivejava.examples.chapter04.item14;

public final class Time {
	private static final int HOURS_PER_DAY = 24;
	private static final int MINUTES_PER_HOUR = 60;

	public final int hour;
	public final int minute;

	public Time(int hour, int minute) {
		if (hour < 0 || hour >= HOURS_PER_DAY)
			throw new IllegalArgumentException("Hour: " + hour);
		if (minute < 0 || minute >= MINUTES_PER_HOUR)
			throw new IllegalArgumentException("Min: " + minute);
		this.hour = hour;
		this.minute = minute;
	}
	// Remainder omitted
}