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类声明以24小时制保留时间
public class Main /**来 自 时 代 J a v a - nowjava.com**/ { public static void main(String[] args) { // create and initialize a Time1 object Time1 time = new Time1(); // invokes Time1 constructor // output string representations of the time displayTime("After time object is created", time); System.out.println(); // change time and output updated time time.setTime(13, 27, 6); //时 代 J a v a - N o w J a v a . c o m 提 供 displayTime("After calling setTime", time); System.out.println(); // attempt to set time with invalid values try { time.setTime(99, 99, 99); // all values out of range } catch (IllegalArgumentException e) { System.out.printf("Exception: %s%n%n", e.getMessage()); } // display time after attempt to set invalid values displayTime("After calling setTime with invalid values", time); } // displays a Time1 object in 24-hour and 12-hour formats private static void displayTime(String header, Time1 t) { System.out.printf("%s%nUniversal time: %s%nStandard time: %s%n", header, t.toUniversalString(), t.toString()); } } class Time1 { private int hour; // 0 - 23 private int minute; // 0 - 59 private int second; // 0 - 59 public void setTime(int hour, int minute, int second) { // validate hour, minute and second if (hour < 0 || hour >= 24 || minute < 0 || minute >= 60 || second < 0 || second >= 60) { throw new IllegalArgumentException( "hour, minute and/or second was out of range"); } this.hour = hour; this.minute = minute; this.second = second; } // convert to String in universal-time format (HH:MM:SS) public String toUniversalString()