code for Diagnostic Demo in java

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.tools.Diagnostic;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompilerTool;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import javax.tools.JavaCompilerTool.CompilationTask;

public class DiagnosticDemo {

public static void main(String[] args) {
String sourceFile = "c:/HelloWorld.Java";
JavaCompilerTool compiler = ToolProvider.getSystemJavaCompilerTool();
DiagnosticCollector diagnostics = new DiagnosticCollector();
StandardJavaFileManager fileManager =

compiler.getStandardFileManager(diagnostics);

List sourceFileList = new ArrayList();
sourceFileList.add(new File(sourceFile));
Iterable compilationUnits = fileManager
.getJavaFileObjectsFromFiles(sourceFileList);
CompilationTask task = compiler.getTask(null, fileManager, null, null, null, compilationUnits);
task.run();
try {
fileManager.close();
} catch (IOException e) {
}
List> diagnosticList = diagnostics.getDiagnostics();
for (Diagnostic diagnostic : diagnosticList) {
System.out.println("Position:" + diagnostic.getStartPosition());
}
}
}