我试图让这个飞机项目工作，我不能为我的生活弄清楚如何在“public void addHours()”中添加时间，或者如果我甚至做了前面的正确！任何帮助都会很棒！

问题有待回答：

创建一个Time类 . 该课程将代表一个时间点，例如出发时间 . 它应该包含2个构造函数，2个实例变量(小时和分钟)和10个方法(见下文) . 除了toString之外的所有方法都应该是24小时格式 . default constructor：为12:00 AM创建一个Time对象 . 重载的构造函数：在特定的小时和分钟创建一个Time对象 . getHour()：返回表示Time对象的小时的整数 . getMinute()：返回表示Time对象分钟的整数 . addHours(...)：通过将对象向前移动数小时来更新对象 . addMinute(...)：通过将对象向前移动几分钟来更新对象 . (提示：请注意，不要让分钟数超过59.)addTime(...)：通过从另一个Time对象向前移动小时和分钟来更新对象 . getCopy(...)：返回一个新的Time对象，该对象具有与现有Time对象相同的小时和分钟 . isEarlierThan(...)：如果此Time对象早于另一个Time对象，则返回true . isSameTime(...)：如果此Time对象与另一个Time对象相同，则返回true . isLaterThan(...)：如果此Time对象晚于另一个Time对象，则返回true . toString()：返回表示Time对象的字符串 . 使用12小时AM / PM格式并将分钟数分为两位数 . 有关示例，请参阅示例输出 .

到目前为止，这是我的Time类：

public class Time {

public static int hour;

public static int minute;

public Time() {

}

public Time(int h, int m) {

h = hour;

m = minute;

}

public int getHour() {

return hour;

}

public int getMinute() {

return minute;

}

public void addHours(int h) {

h = h + hour;

}

public void addMinutes(int m) {

//Minute should not allow past 59 minutes.

if (m <= 59)

m = m + minute;

}

public void addTime(Time other) {

}

public Time getCopy() {

//need to fix return statement

return null;

}

public boolean isEarlierThan(Time other) {

return (Boolean) null;

//need to fix return statement.

}

public boolean isSameTime(Time other) {

return (Boolean) null;

//need to fix return statement.

}

public boolean isLaterTHan(Time other) {

return (Boolean) null;

//need to fix return statement.

}

public String formatDigits(int i) {

return null;

//need to fix return statement.

}

public String toString() {

return null;

}

}

以下是驱动程序：

public class Driver {

public static void main(String[] args) {

//Please note that these tests are not comprehensive.

//testAirline();

//testAirport();

//testPlane();

//testTime();

//testFlight();

}

public static void testAirline() {

System.out.println("==testAirline()==");

/*

//Test 1: create enum variables

Airline a1 = Airline.American;

Airline a2 = Airline.United;

Airline a3 = Airline.Delta;

Airline a4 = Airline.United;

//Test 2: display and compare variables

System.out.println("a1: " + a1);

System.out.println("a2 == a3: " + (a1 == a2));

System.out.println("a2 == a4: " + (a2 == a4));

*/

}

public static void testAirport() {

System.out.println("==testAirport()==");

/*

//Test 1: create enum variables

Airport a1 = Airport.PHX;

Airport a2 = Airport.LAX;

Airport a3 = Airport.SFO;

Airport a4 = Airport.NRT;

Airport a5 = Airport.SIN;

//Test 2: display and compare variables

System.out.println("a1: " + a1);

System.out.println("a2 == a3: " + (a1 == a2));

System.out.println("a2 == a4: " + (a2 == a4));

System.out.println("a1: " + Airport.getAirportCity(a1));

System.out.println("a3: " + Airport.getAirportCity(a3));

System.out.println("a5: " + Airport.getAirportCity(a5));

*/

}

public static void testPlane() {

System.out.println("==testPlane()==");

/*

//Test 1: create plane objects

Plane p1 = new Plane(Airline.Delta, "Boeing 717");

Plane p2 = new Plane(Airline.United, "Airbus A321");

//Test 2: display plane information.

System.out.println(p1.getAirline());

System.out.println(p1.getModel());

System.out.println(p1);

System.out.println(p2);

*/

}

public static void testTime() {

System.out.println("==testTime()==");

/*

//Test 1: use default constructor.

Time t1 = new Time();

//Test 2: use overloaded constructor.

Time t2 = new Time(9, 0);

Time t3 = new Time(1, 15);

//Test 3: use clone operation.

Time t4 = t3.getCopy();

//Test 4: run toString on AM times.

System.out.println(new Time(0, 5));

System.out.println(new Time(1, 15));

System.out.println(new Time(2, 45));

System.out.println(new Time(10, 5));

System.out.println(new Time(11, 15));

//Test 5: run toString on PM times.

System.out.println(new Time(12, 45));

System.out.println(new Time(13, 5));

System.out.println(new Time(22, 15));

System.out.println(new Time(23, 45));

//Test 6: run toString on object from default constructor.

System.out.println("t1: " + t1);

//Test 7: testing addTime operation

System.out.println("t2: " + t2);

t2.addTime(t3);

System.out.println("t2: " + t2);

//Test 8: testing addMinutes operation

t2.addMinutes(181);

System.out.println("t2: " + t2);

//Test 9: testing8 addHours operation

t2.addHours(2);

System.out.println("t2: " + t2);

//Test 10: testing cloned copy.

t4.addHours(1);

System.out.println("t3: " + t3);//original

System.out.println("t4: " + t4);//clone

//Test 11: testing isEarlierThan.

System.out.println("t3 < t4: " + t3.isEarlierThan(t4));

System.out.println("t4 < t3: " + t4.isEarlierThan(t3));

System.out.println("t2 < t4: " + t2.isEarlierThan(t4));

System.out.println("t4 < t2: " + t4.isEarlierThan(t2));

System.out.println("t2 < t2: " + t2.isEarlierThan(t2));

//Test 12: testing isLaterThan.

System.out.println("t2 > t4: " + t2.isLaterThan(t4));

System.out.println("t4 > t2: " + t4.isLaterThan(t2));

System.out.println("t4 > t4: " + t4.isLaterThan(t4));

//Test 13: testing isSameTime.

System.out.println("t2 = t4: " + t2.isSameTime(t4));

System.out.println("t4 = t4: " + t4.isSameTime(t4));

System.out.println("t4 = 2:15AM: " + t4.isSameTime(new Time(2, 15)));

*/

}

public static void testFlight() {

System.out.println("==testFlight()==");

/*

//Test 1: create flights using different settings

Flight f1 = new Flight(new Plane(Airline.American, "Airbus A321"),

"495",

79,

new Time(11,5), 100,

Airport.PHX, Airport.LAX);

Flight f2 = new Flight(new Plane(Airline.Delta, "Boeing 717"),

"1063",

79,

new Time(7, 10),

95,

Airport.PHX,

Airport.LAX);

Flight f3 = new Flight(new Plane(Airline.American, "Airbus A321"),

"400",

44,

new Time(21, 25),

127,

Airport.PHX,

Airport.SFO);

Flight f4 = new Flight(new Plane(Airline.United, "Boeing 787"),

"400",

525,

new Time(10, 50),

715,

Airport.LAX,

Airport.NRT);

Flight f5 = new Flight(new Plane(Airline.United, "Boeing 737"),

"414",

59,

new Time(6, 50),

85,

Airport.LAX,

Airport.SFO);

System.out.println(f1.toDetailedString());

System.out.println();

System.out.println(f1.toOverviewString());

System.out.println();

System.out.println();

System.out.println(f5.toDetailedString());

System.out.println();

System.out.println(f5.toOverviewString());

*/

}

}