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Java 重载构造函数的类声明

欢马劈雪

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重载构造函数的类声明

实例源码：

源代码：

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public class Main

{

public static void main(String[] args)
   /**
    from
   * 时代Java公众号 - N o w J a  v a . c o m 
   **/

{

Time2 t1 = new Time2();       // 00:00:00

Time2 t2 = new Time2(2);      // 02:00:00

Time2 t3 = new Time2(21, 31); // 21:31:00

Time2 t4 = new Time2(12, 25, 42); // 12:25:42

Time2 t5 = new Time2(t4);         // 12:25:42

System.out.println("Constructed with:");

displayTime("t1: all default arguments", t1);

displayTime("t2: hour specified; default minute and second", t2);

displayTime("t3: hour and minute specified; default second", t3);

displayTime("t4: hour, minute and second specified", t4);

displayTime("t5: Time2 object t4 specified", t5);/**来自 n o w    j a v a  . c o m**/

// attempt to initialize t6 with invalid values

try

{

Time2 t6 = new Time2(27, 74, 99); // invalid values

}

catch (IllegalArgumentException e)

{

System.out.printf("%nException while initializing t6: %s%n",

e.getMessage());

}

// displays a Time2 object in 24-hour and 12-hour formats

private static void displayTime(String header, Time2 t)

{

System.out.printf("%s%n   %s%n   %s%n",

header, t.toUniversalString(), t.toString());

}

class Time2

{

private int hour; // 0 - 23

private int minute; // 0 - 59

private int second; // 0 - 59

// Time2 no-argument constructor:

// initializes each instance variable to zero

public Time2()

{

this(0, 0, 0); // invoke constructor with three arguments

}

// Time2 constructor: hour supplied, minute and second defaulted to 0

public Time2(int hour)

{

this(hour, 0, 0); // invoke constructor with three arguments

}

// Time2 constructor: hour and minute supplied, second defaulted to 0

public Time2(int hour, int minute)

{

this(hour, minute, 0); // invoke constructor with three arguments

}

// Time2 constructor: hour, minute and second supplied

public Time2(int hour, int minute, int second)

{

if (hour < 0 || hour >= 24)

throw new IllegalArgumentException("hour must be 0-23");

if (minute < 0 || minute >= 60)

throw new IllegalArgumentException("minute must be 0-59");

if (second < 0 || second >= 60)

throw new IllegalArgumentException("second must be 0-59");

this.hour = hour;

this.minute = minute;

this.second = second;

}

// Time2 constructor: another Time2 object supplied

public Time2(Time2 time)

{

// invoke constructor with three arguments

this(time.getHour(), time.getMinute(), time.getSecond());

}

public void setTime(int hour, int minute, int second)

{

if (hour < 0 || hour >= 24)

throw new IllegalArgumentException("hour must be 0-23");

if (minute < 0 || minute >= 60)

throw new IllegalArgumentException("minute must be 0-59");

if (second < 0 || second >= 60)

throw new IllegalArgumentException("second must be 0-59");

this.hour = hour;

this.minute = minute;

this.second = second;

}

// validate and set hour

public void setHour(int hour)

{

if (hour < 0 || hour >= 24)

throw new IllegalArgumentException("hour must be 0-23");

this.hour = hour;

}

// validate and set minute

public void setMinute(int minute)

{

if (minute < 0 || minute >= 60)

throw new IllegalArgumentException("minute must be 0-59");

this.minute = minute;

}

// validate and set second

public void setSecond(int second)

{

if (second < 0 || second >= 60)

throw new IllegalArgumentException("second must be 0-59");

this.second = second;

}

// Get Methods

// get hour value

public int getHour()

{ 
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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