1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Developing .NET Applications in Java</title>
<link type="text/css" href="../skin/page.css" rel="stylesheet">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<!--================= start Navigation Path ==================-->
<table summary="navigation path" width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td nowrap="nowrap" valign="middle" bgcolor="#CFDCED" height="20"><img height="1" width="5" alt="" src="../skin/images/spacer.gif" class="spacer"><!--===== breadcrumb trail (javascript-generated) ====--><font size="2" face="Arial, Helvetica, Sans-serif"><script src="../skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script></font></td>
</tr>
<tr>
<td bgcolor="#4C6C8F" height="2"><img height="2" width="2" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
</table>
<!--================= end Navigation Path ==================-->
<!--================= start Banner ==================-->
<table summary="header with logos" width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<!--================= start Group Logo ==================-->
<td bgcolor="#294563"></td>
<!--================= end Group Logo ==================-->
<!--================= start Project Logo ==================--><td width="100%" align="center" bgcolor="#294563"><a href="http://www.ikvm.net/"><img border="0" class="logoImage" alt="IKVM.NET" src="../images/project.gif" title="Java on .NET"></a></td>
<!--================= end Project Logo ==================-->
<!--================= start Search ==================--><td valign="top" rowspan="2" bgcolor="#294563"></td>
<!--================= start Search ==================--><td bgcolor="#294563"><img height="10" width="10" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<tr>
<td valign="bottom" bgcolor="#294563" colspan="2">
<!--================= start Tabs ==================-->
<div class="tab">
<table summary="tab bar" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="6"><img alt="" height="8" width="6" src="../skin/images/spacer.gif"></td>
</tr>
</table>
</div>
<!--================= end Tabs ==================-->
</td><td bgcolor="#294563"><img alt="" width="1" height="1" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<tr>
<td bgcolor="#4C6C8F" colspan="4"><img width="1" height="10" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
</table>
<!--================= end Banner ==================-->
<!--================= start Menu, NavBar, Content ==================-->
<table summary="page content" bgcolor="#ffffff" width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td valign="top">
<table summary="menu" border="0" cellspacing="0" cellpadding="0">
<tr>
<!--================= start left top NavBar ==================-->
<td rowspan="3" valign="top">
<table summary="blue line" border="0" cellpadding="0" cellspacing="0">
<tr>
<td bgcolor="#294563"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<tr>
<td bgcolor="#CFDCED"><font color="#4C6C8F" size="4" face="Arial, Helvetica, Sans-serif"> </font></td>
</tr>
<tr>
<td bgcolor="#294563"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
</table>
</td>
<!--================= end left top NavBar ==================--><td bgcolor="#294563"><img width="1" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td valign="bottom" bgcolor="#4C6C8F"><img width="10" height="10" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td nowrap="nowrap" valign="top" bgcolor="#4C6C8F">
<!--================= start Menu items ==================-->
<div class="menu">
<ul>
<li>
<font color="#CFDCED">About</font>
<ul>
<li>
<a href="../index.html" title="">Home</a>
</li>
<li>
<a href="../download.html" title="">Download</a>
</li>
<li>
<a href="../uses.html" title="">Uses</a>
</li>
<li>
<a href="http://weblog.ikvm.net" title="">News</a>
</li>
<li>
<a href="http://sourceforge.net/p/ikvm/wiki/FAQ/" title="">FAQ</a>
</li>
<li>
<a href="http://sourceforge.net/p/ikvm/wiki/License/" title="">License</a>
</li>
<li>
<a href="../stories.html" title="">Case Studies</a>
</li>
</ul>
</li>
<li>
<font color="#CFDCED">User's Guide</font>
<ul>
<li>
<a href="http://sourceforge.net/p/ikvm/wiki/User%27s_Guide/">Introduction</a>
</li>
<li>
<a href="http://sourceforge.net/p/ikvm/wiki/Installation/" title="">Installation</a>
</li>
<li>
<a href="http://sourceforge.net/p/ikvm/wiki/Tutorial/" title="">Tutorial</a>
</li>
<li>
<a href="http://sourceforge.net/p/ikvm/wiki/Tools/" title="">Tools Reference</a>
</li>
</ul>
</li>
<li>
<font color="#CFDCED">Developer's Guide</font>
<ul>
<li>
<a href="../devguide/intro.html" title="">Introduction</a>
</li>
<li>
<a href="../devguide/concepts.html" title="">Concepts</a>
</li>
<li>
<a href="../devguide/net2java.html" title="">Using Java Libraries</a>
</li>
<li>
<span class="sel"><font color="#ffcc00">Developing in Java</font></span>
</li>
</ul>
</li>
<li>
<font color="#CFDCED">Contributing</font>
<ul>
<li>
<a href="http://sourceforge.net/mail/?group_id=69637">Mailing Lists</a>
</li>
<li>
<a href="http://sourceforge.net/tracker/?group_id=69637">Report Bugs</a>
</li>
<li>
<a href="http://sourceforge.net/cvs/?group_id=69637">CVS Repository</a>
</li>
</ul>
</li>
</ul>
</div>
<!--================= end Menu items ==================-->
</td><td valign="bottom" bgcolor="#4C6C8F"><img width="10" height="10" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td bgcolor="#294563"><img width="1" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<tr>
<td valign="bottom" align="left" colspan="2" rowspan="2" bgcolor="#4C6C8F"><img height="10" width="10" border="0" alt="" src="../skin/images/menu-left.gif"></td><td bgcolor="#4C6C8F"><img height="10" width="10" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td valign="bottom" align="right" colspan="2" rowspan="2" bgcolor="#4C6C8F"><img height="10" width="10" border="0" alt="" src="../skin/images/menu-right.gif"></td>
</tr>
<tr>
<td height="1" bgcolor="#294563"><img width="1" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
</table>
</td><td valign="top" width="100%">
<table summary="content" width="100%" border="0" cellpadding="0" cellspacing="0">
<!--================= start middle NavBar ==================-->
<tr>
<td colspan="4" bgcolor="#294563"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<tr>
<td align="left" width="10" bgcolor="#CFDCED"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td align="left" width="50%" bgcolor="#CFDCED"><font color="#4C6C8F" size="3" face="Arial, Helvetica, Sans-serif">
</font><img width="10" height="8" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td align="right" width="50%" bgcolor="#CFDCED"><font color="#4C6C8F" size="3" face="Arial, Helvetica, Sans-serif">
</font><img width="10" height="8" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td width="10" bgcolor="#CFDCED"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<tr>
<td colspan="4" bgcolor="#294563"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<!--================= end middle NavBar ==================-->
<!--================= start Content==================-->
<tr>
<td align="left" width="10"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td><td colspan="2" align="left" width="100%">
<div xmlns:xhtml="http://www.w3.org/1999/xhtml" class="content">
<table class="title" summary="">
<tr>
<td valign="middle">
<h1>Developing .NET Applications in Java</h1>
</td>
</tr>
</table>
<p>This section discusses information you need to know when you
want to develop .NET applications in Java. </p>
<ul class="minitoc">
<li>
<a href="#Overview">Overview</a>
</li>
<li>
<a href="#Mapping+.NET+API%27s+to+Java">Mapping .NET API's to Java</a>
</li>
<li>
<a href="#Properties">Properties</a>
</li>
<li>
<a href="#Enumerations">Enumerations</a>
</li>
<li>
<a href="#Delegates+and+Event+Processing">Delegates and Event Processing</a>
</li>
<li>
<a href="#Varargs">Varargs</a>
</li>
</ul>
<a name="N10015"></a><a name="Overview"></a>
<h3>Overview</h3>
<div style="margin-left: 0 ; border: 2px">
<p>IKVM makes it possible to develop .NET applications using the Java language. Here's how it works:</p>
<ol>
<li>Identify .NET classes you want to use in your application.</li>
<li>Identify which .NET dll's contain the .NET classes you identified in step 1.
<p>
<strong>Tip:</strong> If you're developing on Windows, the Microsoft .NET SDK Class Reference documentation identifies the assembly / dll
for a .NET class at the bottom of each class overview page.</p>
</li>
<li>Use the <a href="http://sourceforge.net/p/ikvm/wiki/Ikvmstub/">ikvmstub</a> application to generate a Java jar file for each dll you identified in step 2.
<p>The ikvmstub tool analyzes the .NET classes in the designated dll
and generates a jar file containing Java interfaces and stub classes. This information is needed by the Java source compiler, which
knows nothing about .NET assemblies.</p>
</li>
<li>Compile your Java source code using javac or jikes, with the ikvmstub-generated jar files on the compiler classpath.</li>
<li>Compile the resulting Java classes using ikvmc. Use the -reference option to reference the dll's containing the
.NET classes you used; do <em>not</em> include the ikvmstub-generated jar files on the compiler classpath.</li>
</ol>
<p>For an example of this, see the <a href="http://sourceforge.net/p/ikvm/wiki/Tutorial/">tutorial</a>.</p>
</div>
<a name="N10047"></a><a name="Mapping+.NET+API%27s+to+Java"></a>
<h3>Mapping .NET API's to Java</h3>
<div style="margin-left: 0 ; border: 2px">
<p>When ikvmstub generates a stub jarfile, it has to prevent namespace conflicts between Java API classes and
generated stub classes. It must also map .NET features such as properties, delegates, enumerations,
and variable-length argument lists to Java language equivalents.
</p>
<p>To prevent namespace conflicts, ikvmstub creates Java package names from .NET namespaces by
prefixing them with cli. For example, a .NET class in the <span class="codefrag">System.IO</span> namespace would have a stub generated
for it in a Java package named <span class="codefrag">cli.System.IO</span>. So, when writing Java code that uses the
System.IO.File class, you would use one of the following import statements in your Java code:</p>
<div class="pre">
<span class="codefrag"> import cli.System.IO.*;
import cli.System.IO.File;
</span>
</div>
<p>The following sections discuss how .NET features are mapped to the Java language. Some of the mappings,
such as properties and enumerations, are fairly straightforward. Others, such as delegates and event handling,
require a little more work. </p>
<p>
<strong>Tip:</strong> Java development tools that
provide code assist features are a great help when writing applications that use .NET API's.
If you install the ikvmstub-generated jar files into your favorite Java IDE, you can use code completion to help you
use the .NET methods, properties, and enumerations correctly. Note, however, that you will not be able to test
your applications using your Java IDE debugger.
</p>
</div>
<a name="N10069"></a><a name="Properties"></a>
<h3>Properties</h3>
<div style="margin-left: 0 ; border: 2px">
<p>Since Java has no direct language support for properties, ikvmstub maps .NET properties to Java getter and
setter methods. A .NET property defined in C# like this:</p>
<pre class="code">
public <em>datatype</em> <em>property-name</em> {
get { ... }
set { ... }
}</pre>
<p>would be translated to a pair of Java stub methods, like this:</p>
<pre class="code">
public <em>datatype</em> get_<em>property-name</em>( ) { ... }
public void set_<em>property-name</em>(<em>datatype</em> value) { ... }</pre>
<p>Here is an example of C# code that uses a property, and how you would access the same property in Java:
</p>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
<tr>
<th colspan="1" rowspan="1">C#</th>
<th colspan="1" rowspan="1">Java</th>
</tr>
<tr>
<td colspan="1" rowspan="1">
<div class="pre">
<span class="codefrag">
int weight = bear.Weight;
bear.Weight = 15;
</span>
</div>
</td>
<td colspan="1" rowspan="1">
<div class="pre">
<span class="codefrag">
int weight = bear.get_Weight();
bear.set_Weight(15);
</span>
</div>
</td>
</tr>
</table>
</div>
<a name="N100BE"></a><a name="Enumerations"></a>
<h3>Enumerations</h3>
<div style="margin-left: 0 ; border: 2px">
<p>TODO. For now, see the <a href="http://weblog.ikvm.net/allentries.aspx">IKVM Weblog</a>, March 20, 2004 entry.
</p>
</div>
<a name="N100CC"></a><a name="Delegates+and+Event+Processing"></a>
<h3>Delegates and Event Processing</h3>
<div style="margin-left: 0 ; border: 2px">
<p>TODO. For now, see the <a href="http://weblog.ikvm.net/allentries.aspx">IKVM Weblog</a>, March 20, 2004 entry.
Also, see the winforms sample.</p>
</div>
<a name="N100DA"></a><a name="Varargs"></a>
<h3>Varargs</h3>
<div style="margin-left: 0 ; border: 2px">
<p>TODO. For now, see the <a href="http://weblog.ikvm.net/allentries.aspx">IKVM Weblog</a>, March 20, 2004 entry.
Also, see the usenetapi/CreateFile.java sample.</p>
</div>
<div class="attribution">by Stephen Schaub</div>
</div>
</td><td width="10"><img width="10" height="1" alt="" src="../skin/images/spacer.gif" class="spacer"></td>
</tr>
<!--================= end Content==================-->
</table>
</td>
</tr>
</table>
<!--================= end Menu, NavBar, Content ==================-->
<!--================= start Footer ==================-->
<table summary="footer" cellspacing="0" cellpadding="0" width="100%" border="0">
<tr>
<td colspan="2" height="1" bgcolor="#4C6C8F"><img height="1" width="1" alt="" src="../skin/images/spacer.gif" class="spacer"><a href="../skin/images/label.gif"></a><a href="../skin/images/page.gif"></a><a href="../skin/images/chapter.gif"></a><a href="../skin/images/chapter_open.gif"></a><a href="../skin/images/current.gif"></a><a href="/favicon.ico"></a></td>
</tr>
<tr>
<td colspan="2" bgcolor="#CFDCED" class="copyright" align="center"><font size="2" face="Arial, Helvetica, Sans-Serif">
Send feedback about this page to <a href="mailto:webmaster@ikvm.net?subject=IKVM Website Feedback - Page devguide/java2net.html">webmaster@ikvm.net</a>
<br>
Copyright ©
2002-2011 Jeroen Frijters All rights reserved.<script type="text/javascript" language="JavaScript"><!--
document.write(" - "+"Last Published: " + document.lastModified);
// --></script></font></td>
</tr>
<tr>
<td colspan="2" align="left" bgcolor="#CFDCED" class="logos"></td>
</tr>
</table>
<!--================= end Footer ==================-->
</body>
</html>
|
