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  3.  <head>
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  4.   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    5. 

  5.   <title>Basic usage</title>
    6. 

  6. 

  7.  </head>
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  8.  <body><div class="manualnavbar" style="text-align: center;">
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  9.  <div class="prev" style="text-align: left; float: left;"><a href="java.examples.html">范例</a></div>
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  10.  <div class="next" style="text-align: right; float: right;"><a href="ref.java.html">Java 函数</a></div>
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  11.  <div class="up"><a href="java.examples.html">范例</a></div>
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  12.  <div class="home"><a href="index.html">PHP Manual</a></div>
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  13. </div><hr /><div id="java.examples-basic" class="section">
    14. 

  14.   <h2 class="title">Basic usage</h2>
    15. 

  15.   <p class="para">
    16. 

  16.    <div class="example" id="example-4154">
    17. 

  17.     <p><strong>Example #1 Java Example</strong></p>
    18. 

  18.     <div class="example-contents">
    19. 

  19. <div class="phpcode"><code><span style="color: #000000">
    20. 

  20. <span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;get&nbsp;instance&nbsp;of&nbsp;Java&nbsp;class&nbsp;java.lang.System&nbsp;in&nbsp;PHP<br /></span><span style="color: #0000BB">$system&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Java</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.lang.System'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;demonstrate&nbsp;property&nbsp;access<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">'Java&nbsp;version='&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$system</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getProperty</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.version'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">'&lt;br&nbsp;/&gt;'</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #DD0000">'Java&nbsp;vendor='&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$system</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getProperty</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.vendor'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">'&lt;br&nbsp;/&gt;'</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #DD0000">'OS='&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$system</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getProperty</span><span style="color: #007700">(</span><span style="color: #DD0000">'os.name'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">'&nbsp;'&nbsp;</span><span style="color: #007700">.<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$system</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getProperty</span><span style="color: #007700">(</span><span style="color: #DD0000">'os.version'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">'&nbsp;on&nbsp;'&nbsp;</span><span style="color: #007700">.<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$system</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getProperty</span><span style="color: #007700">(</span><span style="color: #DD0000">'os.arch'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">'&nbsp;&lt;br&nbsp;/&gt;'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;java.util.Date&nbsp;example<br /></span><span style="color: #0000BB">$formatter&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Java</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.text.SimpleDateFormat'</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"EEEE,&nbsp;MMMM&nbsp;dd,&nbsp;yyyy&nbsp;'at'&nbsp;h:mm:ss&nbsp;a&nbsp;zzzz"</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">$formatter</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">format</span><span style="color: #007700">(new&nbsp;</span><span style="color: #0000BB">Java</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.util.Date'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?&gt;</span>
    21. 

  21. </span>
    22. 

  22. </code></div>
    23. 

  23.     </div>
    24. 

  24. 

  25.    </div>
    26. 

  26.    <div class="example" id="example-4155">
    27. 

  27.     <p><strong>Example #2 AWT Example</strong></p>
    28. 

  28.     <div class="example-contents">
    29. 

  29. <div class="phpcode"><code><span style="color: #000000">
    30. 

  30. <span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;This&nbsp;example&nbsp;is&nbsp;only&nbsp;intended&nbsp;to&nbsp;be&nbsp;run&nbsp;using&nbsp;the&nbsp;CLI.<br /><br /></span><span style="color: #0000BB">$frame&nbsp;&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Java</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.awt.Frame'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'PHP'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$button&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Java</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.awt.Button'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'Hello&nbsp;Java&nbsp;World!'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$frame</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">add</span><span style="color: #007700">(</span><span style="color: #DD0000">'North'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$button</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$frame</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">validate</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$frame</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">pack</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$frame</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">visible&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">True</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$thread&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Java</span><span style="color: #007700">(</span><span style="color: #DD0000">'java.lang.Thread'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$thread</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">sleep</span><span style="color: #007700">(</span><span style="color: #0000BB">10000</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$frame</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">dispose</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
    31. 

  31. </span>
    32. 

  32. </code></div>
    33. 

  33.     </div>
    34. 

  34. 

  35.    </div>
    36. 

  36. 

  37.    Notes:
    38. 

  38. 

  39.    <ul class="itemizedlist">
    40. 

  40.     <li class="listitem">
    41. 

  41.      <span class="simpara">
    42. 

  42.       <em>new Java()</em> will create an instance of a class if 
    43. 

  43.       a suitable constructor is available. If no parameters are passed and 
    44. 

  44.       the default constructor is useful as it provides access to classes 
    45. 

  45.       like <em>java.lang.System</em> which expose most of their 
    46. 

  46.       functionality through static methods.
    47. 

  47.      </span>
    48. 

  48.     </li>
    49. 

  49.     <li class="listitem">
    50. 

  50.      <span class="simpara">
    51. 

  51.       Accessing a member of an instance will first look for bean properties
    52. 

  52.       then public fields. In other words, <em>print $date.time</em>
    53. 

  53.       will first attempt to be resolved as <em>$date.getTime()</em>,
    54. 

  54.       then as <em>$date.time</em>.
    55. 

  55.      </span>
    56. 

  56.     </li>
    57. 

  57.     <li class="listitem">
    58. 

  58.      <span class="simpara">
    59. 

  59.       Both static and instance members can be accessed on an object with
    60. 

  60.       the same syntax. Furthermore, if the java object is of type
    61. 

  61.       <em>java.lang.Class</em>, then static members of the class 
    62. 

  62.       (fields and methods) can be accessed.
    63. 

  63.      </span>
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  64.     </li>
    65. 

  65.     <li class="listitem">
    66. 

  66.      <p class="para">
    67. 

  67.       Exceptions raised result in PHP warnings, and <strong><code>NULL</code></strong> results. The
    68. 

  68.       warnings may be eliminated by prefixing the method call with an
    69. 

  69.       &quot;@&quot; sign. The following APIs may be used to retrieve and reset
    70. 

  70.       the last error:
    71. 

  71.       <ul class="itemizedlist">
    72. 

  72.        <li class="listitem"><span class="simpara"> <span class="function"><a href="function.java-last-exception-get.html" class="function">java_last_exception_get()</a></span></span></li>
    73. 

  73.        <li class="listitem"><span class="simpara"> <span class="function"><a href="function.java-last-exception-clear.html" class="function">java_last_exception_clear()</a></span></span></li>
    74. 

  74.       </ul>
    75. 

  75.      </p>
    76. 

  76.     </li>
    77. 

  77.     <li class="listitem">
    78. 

  78.      <span class="simpara">
    79. 

  79.       Overload resolution is in general a hard problem given the
    80. 

  80.       differences in types between the two languages. The PHP Java
    81. 

  81.       extension employs a simple, but fairly effective, metric for
    82. 

  82.       determining which overload is the best match.
    83. 

  83.      </span>
    84. 

  84.      <span class="simpara">
    85. 

  85.       Additionally, method names in PHP are not case sensitive, potentially
    86. 

  86.       increasing the number of overloads to select from.
    87. 

  87.      </span>
    88. 

  88.      <span class="simpara">
    89. 

  89.       Once a method is selected, the parameters are coerced if necessary, 
    90. 

  90.       possibly with a loss of data (example: double precision floating point
    91. 

  91.       numbers will be converted to boolean).
    92. 

  92.       
    93. 

  93.      </span>
    94. 

  94.     </li>
    95. 

  95.     <li class="listitem">
    96. 

  96.      <span class="simpara">
    97. 

  97.       In the tradition of PHP, arrays and hashtables may pretty much
    98. 

  98.       be used interchangeably. Note that hashtables in PHP may only be
    99. 

  99.       indexed by integers or strings; and that arrays of primitive types
    100. 

  100.       in Java can not be sparse. Also note that these constructs are
    101. 

  101.       passed by value, so may be expensive in terms of memory and time.
    102. 

  102.      </span>
    103. 

  103.     </li>
    104. 

  104.    </ul>
    105. 

  105.   </p>
    106. 

  106.  </div><hr /><div class="manualnavbar" style="text-align: center;">
    107. 

  107.  <div class="prev" style="text-align: left; float: left;"><a href="java.examples.html">范例</a></div>
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  109.  <div class="up"><a href="java.examples.html">范例</a></div>
    110. 

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  111. </div></body></html>
    112. 

  112.