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Java 重载构造函数的类声明
重载构造函数的类声明
实例源码：
源代码：
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public class Main 3
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{5
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public static void main(String[] args)7
/**8
from9
* 时代Java公众号 - N o w J a v a . c o m 10
**/11
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{13
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Time2 t1 = new Time2(); // 00:00:0015
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Time2 t2 = new Time2(2); // 02:00:0017
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Time2 t3 = new Time2(21, 31); // 21:31:0019
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Time2 t4 = new Time2(12, 25, 42); // 12:25:4221
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Time2 t5 = new Time2(t4); // 12:25:4223
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System.out.println("Constructed with:");26
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displayTime("t1: all default arguments", t1);28
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displayTime("t2: hour specified; default minute and second", t2);30
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displayTime("t3: hour and minute specified; default second", t3);32
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displayTime("t4: hour, minute and second specified", t4);34
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displayTime("t5: Time2 object t4 specified", t5);/**来自 n o w j a v a . c o m**/36
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// attempt to initialize t6 with invalid values39
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try41
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{43
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Time2 t6 = new Time2(27, 74, 99); // invalid values45
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} 47
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catch (IllegalArgumentException e)49
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{51
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System.out.printf("%nException while initializing t6: %s%n",53
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e.getMessage());55
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} 57
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} 59
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// displays a Time2 object in 24-hour and 12-hour formats62
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private static void displayTime(String header, Time2 t)64
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{66
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System.out.printf("%s%n %s%n %s%n",68
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header, t.toUniversalString(), t.toString());70
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} 72
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}74
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class Time278
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{80
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private int hour; // 0 - 2382
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private int minute; // 0 - 5984
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private int second; // 0 - 5986
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// Time2 no-argument constructor: 89
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// initializes each instance variable to zero91
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public Time2()93
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{95
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this(0, 0, 0); // invoke constructor with three arguments97
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} 99
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// Time2 constructor: hour supplied, minute and second defaulted to 0102
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public Time2(int hour) 104
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{ 106
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this(hour, 0, 0); // invoke constructor with three arguments108
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} 110
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// Time2 constructor: hour and minute supplied, second defaulted to 0113
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public Time2(int hour, int minute) 115
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{ 117
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this(hour, minute, 0); // invoke constructor with three arguments119
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} 121
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// Time2 constructor: hour, minute and second supplied124
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public Time2(int hour, int minute, int second) 126
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{ 128
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if (hour < 0 || hour >= 24)130
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throw new IllegalArgumentException("hour must be 0-23");132
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if (minute < 0 || minute >= 60)135
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throw new IllegalArgumentException("minute must be 0-59");137
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if (second < 0 || second >= 60)140
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throw new IllegalArgumentException("second must be 0-59");142
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this.hour = hour;145
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this.minute = minute; 147
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this.second = second; 149
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} 151
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// Time2 constructor: another Time2 object supplied154
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public Time2(Time2 time)156
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{158
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// invoke constructor with three arguments160
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this(time.getHour(), time.getMinute(), time.getSecond());162
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} 164
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public void setTime(int hour, int minute, int second)167
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{169
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if (hour < 0 || hour >= 24)171
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throw new IllegalArgumentException("hour must be 0-23");173
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if (minute < 0 || minute >= 60)176
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throw new IllegalArgumentException("minute must be 0-59");178
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if (second < 0 || second >= 60)181
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throw new IllegalArgumentException("second must be 0-59");183
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this.hour = hour;186
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this.minute = minute; 188
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this.second = second; 190
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} 192
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// validate and set hour 195
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public void setHour(int hour) 197
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{ 199
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if (hour < 0 || hour >= 24)201
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throw new IllegalArgumentException("hour must be 0-23");203
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this.hour = hour;206
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} 208
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// validate and set minute 211
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public void setMinute(int minute) 213
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{ 215
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if (minute < 0 || minute >= 60)217
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throw new IllegalArgumentException("minute must be 0-59");219
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this.minute = minute; 222
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} 224
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// validate and set second 227
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public void setSecond(int second) 229
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{ 231
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if (second < 0 || second >= 60)233
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throw new IllegalArgumentException("second must be 0-59");235
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this.second = second; 238
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} 240
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// Get Methods243
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// get hour value245
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public int getHour() 247
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{ 249
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