StackOverflow2013

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plurals

PO
primarykey
Id
11299614
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-07-02T19:01:03.980
FavoriteCount
0
LastActivityDate
2012-07-02T19:08:24.270
LastEditDate
2012-07-02T19:08:24.270
LastEditorUserId
470838
OwnerUserId
470838
ParentId
11298856
PostTypeId
2
Score
15
ViewCount
0
LastEditorDisplayName
text
Body
As of Java 6 you can use <a href="http://docs.oracle.com/javase/6/docs/api/javax/tools/JavaCompiler.html">JavaCompiler</a> to compile the text and get back <a href="http://docs.oracle.com/javase/6/docs/api/index.html?javax/tools/Diagnostic.html">Diagnostic</a> objects that tell you what problems the file has (if any). So for your example you'd need to take the content of the editor and pass it to the JavaCompiler, run it, and report back any problems. Example that follows assumes editor text written out to a file. Example code: File to Check <pre><code>public class HelloBuggyWorld { String test // missing a semicolon public static void main (String [] args) { System.out.println('Hello World!'); // should be double quoted } } </code></pre> Checker <pre><code>import java.util.ArrayList; import java.util.Arrays; import java.util.Formatter; import java.util.List; import java.util.Locale; import javax.tools.Diagnostic; import javax.tools.DiagnosticCollector; import javax.tools.JavaCompiler; import javax.tools.JavaFileObject; import javax.tools.StandardJavaFileManager; import javax.tools.ToolProvider; public class JavaSyntaxChecker { public static void main(String[] args) { System.out.println(JavaSyntaxChecker.check("/path/to/HelloBuggyWorld.java")); } public static List<String> check(String file) { JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null); Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjectsFromStrings(Arrays.asList(file)); DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>(); compiler.getTask(null, fileManager, diagnostics, null, null, compilationUnits).call(); List<String> messages = new ArrayList<String>(); Formatter formatter = new Formatter(); for (Diagnostic diagnostic : diagnostics.getDiagnostics()) { messages.add(diagnostic.getKind() + ":\t Line [" + diagnostic.getLineNumber() + "] \t Position [" + diagnostic.getPosition() + "]\t" + diagnostic.getMessage(Locale.ROOT) + "\n"); } return messages; } } </code></pre> Output From running the <code>main</code> method. <pre><code>[ERROR: Line [5] Position [124] HelloBuggyWorld.java:5: unclosed character literal , ERROR: Line [5] Position [126] HelloBuggyWorld.java:5: ';' expected , ERROR: Line [5] Position [131] HelloBuggyWorld.java:5: not a statement , ERROR: Line [5] Position [136] HelloBuggyWorld.java:5: ';' expected , ERROR: Line [5] Position [137] HelloBuggyWorld.java:5: unclosed character literal ] </code></pre>
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