[php]数据结构&算法(PHP描述) 三元组 Triplet

<?php
 2 /**
 3  *  三元组 Triplet
 4  *
 5 */
 6 class Triplet
 7 {
 8 private$_data=null;
 9 
10 // 初始化三元组
11 publicfunction init($val1,$val2,$val3)
12     {
13 $this->_data[0] =$val1;
14 $this->_data[1] =$val2;
15 $this->_data[2] =$val3;
16 returntrue;
17     }
18 
19 // 销毁三元组
20 publicfunction destroy()
21     {
22 unset($this->_data);
23 returntrue;
24     }
25 
26 // 返回第$key的值
27 publicfunction get($key)
28     {
29 if($key<1||$key>3) returnfalse;
30 return$this->_data[$key-1];
31     }
32 
33 // 设置第$key元的值为$val
34 publicfunction put($key,$val)
35     {
36 if($key<1||$key>3) returnfalse;
37 $this->_data[$key-1] =$val;
38 returntrue;
39     }
40 
41 // 是否按升序排序
42 publicfunction isAscending()
43     {
44 return ($this->_data[0] <=$this->_data[1]) && ($this->_data[1] <=$this->_data[2]);
45     }
46 
47 // 是否按降序排序
48 publicfunction isDescending()
49     {
50 return ($this->_data[0] >=$this->_data[1]) && ($this->_data[1] >=$this->_data[2]);
51     }
52 
53 // 获取最大值
54 publicfunctionmax()
55     {
56 return ($this->_data[0] >=$this->_data[1])? ($this->_data[0] >=$this->_data[2])?$this->_data[0] :$this->_data[2] : ($this->_data[1] >=$this->_data[2])?$this->_data[1] :$this->_data[2];
57     }
58 
59 // 获取最小值
60 publicfunctionmin()
61     {
62 return ($this->_data[0] <=$this->_data[1])? ($this->_data[0] <=$this->_data[2])?$this->_data[0] :$this->_data[2] : ($this->_data[1] <=$this->_data[2])?$this->_data[1] :$this->_data[2];
63     }
64 }
65 
66 //
67 $objTriplet=new Triplet();
68 echo"init:";var_dump($objTriplet->init(1,2,3)); echo"<br/>";
69 
70 echo"get 1:";var_dump($objTriplet->get(1)); echo"<br/>";
71 echo"get 4:";var_dump($objTriplet->get(4)); echo"<br/>"; // false
72 echo"put 3,4:";var_dump($objTriplet->put(3,4)); echo"<br/>";
73 
74 echo"max:";var_dump($objTriplet->max()); echo"<br/>";
75 echo"min:";var_dump($objTriplet->min()); echo"<br/>";
76 
77 echo"isAscending:";var_dump($objTriplet->isAscending()); echo"<br/>";
78 echo"isDescending:";var_dump($objTriplet->isDescending()); echo"<br/>";
79 ?>