List of usage examples for java.lang Class newInstance
@CallerSensitive @Deprecated(since = "9") public T newInstance() throws InstantiationException, IllegalAccessException
From source file:Deet.java
public static void main(String... args) { if (args.length != 4) { err.format("Usage: java Deet <classname> <langauge> <country> <variant>%n"); return;//from w ww . ja v a2s. c o m } try { Class<?> c = Class.forName(args[0]); Object t = c.newInstance(); Method[] allMethods = c.getDeclaredMethods(); for (Method m : allMethods) { String mname = m.getName(); if (!mname.startsWith("test") || (m.getGenericReturnType() != boolean.class)) { continue; } Type[] pType = m.getGenericParameterTypes(); if ((pType.length != 1) || Locale.class.isAssignableFrom(pType[0].getClass())) { continue; } out.format("invoking %s()%n", mname); try { m.setAccessible(true); Object o = m.invoke(t, new Locale(args[1], args[2], args[3])); out.format("%s() returned %b%n", mname, (Boolean) o); // Handle any exceptions thrown by method to be invoked. } catch (InvocationTargetException x) { Throwable cause = x.getCause(); err.format("invocation of %s failed: %s%n", mname, cause.getMessage()); } } // production code should handle these exceptions more gracefully } catch (ClassNotFoundException x) { x.printStackTrace(); } catch (InstantiationException x) { x.printStackTrace(); } catch (IllegalAccessException x) { x.printStackTrace(); } }
From source file:kilim.test.TaskTestClassLoader.java
public static void main(String[] args) throws Exception { Class<?> c = new TaskTestClassLoader(Thread.currentThread().getContextClassLoader()).loadClass(args[0], true);/*from w w w . jav a 2 s . c o m*/ c.newInstance(); }
From source file:HasBatteries.java
public static void main(String[] args) { Class c = null;/*from w w w . j a va2 s. c o m*/ try { c = Class.forName("FancyToy"); } catch (ClassNotFoundException e) { System.out.println("Can't find FancyToy"); System.exit(1); } printInfo(c); Class[] faces = c.getInterfaces(); for (int i = 0; i < faces.length; i++) printInfo(faces[i]); Class cy = c.getSuperclass(); Object o = null; try { // Requires default constructor: o = cy.newInstance(); // (*1*) } catch (InstantiationException e) { System.out.println("Cannot instantiate"); System.exit(1); } catch (IllegalAccessException e) { System.out.println("Cannot access"); System.exit(1); } printInfo(o.getClass()); }
From source file:MainClass.java
public static void main(String args[]) { String name = "http://urlWithClassName"; try {//from w ww. j a va 2s . com if (!name.endsWith(".class")) { System.err.println("That doesn't look like a byte code file!"); return; } URL u = new URL(name); URLClassLoader ucl = new URLClassLoader(u); // parse out the name of the class from the URL String s = u.getFile(); String classname = s.substring(s.lastIndexOf('/'), s.lastIndexOf(".class")); Class AppletClass = ucl.loadClass(classname, true); Applet apl = (Applet) AppletClass.newInstance(); JFrame f = new JFrame(); f.setSize(200, 200); f.add("Center", apl); apl.init(); apl.start(); f.setVisible(true); } catch (Exception e) { System.err.println(e); } }
From source file:com.pervasive07.MsgReader.java
public static void main(String[] args) throws Exception { String source = null;/* ww w . j a v a 2 s. co m*/ Vector v = new Vector(); if (args.length > 0) { for (int i = 0; i < args.length; i++) { if (args[i].equals("-comm")) { source = args[++i]; } else { String className = args[i]; try { Class c = Class.forName(className); Object packet = c.newInstance(); Message msg = (Message) packet; if (msg.amType() < 0) { System.err.println(className + " does not have an AM type - ignored"); } else { v.addElement(msg); } } catch (Exception e) { System.err.println(e); } } } } else if (args.length != 0) { usage(); System.exit(1); } MsgReader mr = new MsgReader(source); Enumeration msgs = v.elements(); while (msgs.hasMoreElements()) { Message m = (Message) msgs.nextElement(); mr.addMsgType(m); } mr.start(); }
From source file:MinAppletviewer.java
public static void main(String args[]) throws Exception { AppSupport theAppSupport = new AppSupport(); JFrame f = new JFrame(); URL toload = new URL(args[0]); String host = toload.getHost(); int port = toload.getPort(); String protocol = toload.getProtocol(); String path = toload.getFile(); int join = path.lastIndexOf('/'); String file = path.substring(join + 1); path = path.substring(0, join + 1);//from w ww .java2s.c om theAppSupport.setCodeBase(new URL(protocol, host, port, path)); theAppSupport.setDocumentBase(theAppSupport.getCodeBase()); URL[] bases = { theAppSupport.getCodeBase() }; URLClassLoader loader = new URLClassLoader(bases); Class theAppletClass = loader.loadClass(file); Applet theApplet = (Applet) (theAppletClass.newInstance()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(theApplet, BorderLayout.CENTER); theApplet.setStub(theAppSupport); f.setSize(200, 200); f.setVisible(true); theApplet.init(); theApplet.start(); }
From source file:com.spotify.cassandra.opstools.CountTombstones.java
/** * Counts the number of tombstones, per row, in a given SSTable * * Assumes RandomPartitioner, standard columns and UTF8 encoded row keys * * Does not require a cassandra.yaml file or system tables. * * @param args command lines arguments//ww w .j av a2 s.c om * * @throws java.io.IOException on failure to open/read/write files or output streams */ public static void main(String[] args) throws IOException, ParseException { String usage = String.format("Usage: %s [-l] <sstable> [<sstable> ...]%n", CountTombstones.class.getName()); final Options options = new Options(); options.addOption("l", "legend", false, "Include column name explanation"); options.addOption("p", "partitioner", true, "The partitioner used by database"); CommandLineParser parser = new BasicParser(); CommandLine cmd = parser.parse(options, args); if (cmd.getArgs().length < 1) { System.err.println("You must supply at least one sstable"); System.err.println(usage); System.exit(1); } // Fake DatabaseDescriptor settings so we don't have to load cassandra.yaml etc Config.setClientMode(true); String partitionerName = String.format("org.apache.cassandra.dht.%s", options.hasOption("p") ? options.getOption("p") : "RandomPartitioner"); try { Class<?> clazz = Class.forName(partitionerName); IPartitioner partitioner = (IPartitioner) clazz.newInstance(); DatabaseDescriptor.setPartitioner(partitioner); } catch (Exception e) { throw new RuntimeException("Can't instantiate partitioner " + partitionerName); } PrintStream out = System.out; for (String arg : cmd.getArgs()) { String ssTableFileName = new File(arg).getAbsolutePath(); Descriptor descriptor = Descriptor.fromFilename(ssTableFileName); run(descriptor, cmd, out); } System.exit(0); }
From source file:gis.proj.drivers.SnyderTest.java
public static void main(String... args) { SnyderTest sfTest = new SnyderTest(); JCommander jc = new JCommander(sfTest); try {/* w ww. ja v a2s. c om*/ jc.parse(args); } catch (Exception e) { jc.usage(); System.exit(-10); } Snyder.printLicenseInformation("SnyderTest"); double[][] fVal = null; // forward values double[][] iVal = null; // inverse values Ellipsoid ellip; Datum datum; Projection proj; ArrayList<Fiducial> testData = null; try { testData = Snyder.fromJSON(new TypeReference<ArrayList<Fiducial>>() { }, sfTest.ifName); } catch (Exception e) { } if (testData != null) { for (Fiducial sf : testData) { ellip = null; datum = null; proj = null; ellip = EllipsoidFactory.getInstance().getEllipsoid(sf.getEllipsoid()); datum = new Datum(); for (Entry<String, String> entry : sf.getDatum().entrySet()) { datum.setUserOverrideProperty(entry.getKey(), Snyder.parseDatumVal(entry.getValue().toLowerCase())); } try { Class<?> cls = Class.forName(sf.getProjection()); proj = (Projection) cls.newInstance(); } catch (Exception ex) { ex.printStackTrace(); } fVal = proj.forward(new double[] { sf.getLon() * SnyderMath.DEG_TO_RAD }, new double[] { sf.getLat() * SnyderMath.DEG_TO_RAD }, ellip, datum); iVal = proj.inverse(new double[] { fVal[0][0] }, new double[] { fVal[1][0] }, ellip, datum); iVal[0][0] *= SnyderMath.RAD_TO_DEG; iVal[1][0] *= SnyderMath.RAD_TO_DEG; sf.setPassed(fVal[0][0], fVal[1][0], iVal[0][0], iVal[1][0]); } try { if (sfTest.ofName != null) sfTest.om.writeValue(new File(sfTest.ofName), testData); } catch (Exception e) { System.out.println("Couldn't write the fiducial data results, of=" + sfTest.ofName); System.exit(-1); } System.out.print("\n**********************************************************************\n"); System.out.print("SNYDER TEST SUMMARY"); System.out.print("\n**********************************************************************\n"); System.out.println("\n\t Total test cases : " + testData.size()); } else { System.out.println("Couldn't load the fiducial data, if=" + sfTest.ifName); System.exit(-1); } }
From source file:ClassForName.java
public static void main(String[] av) { Class c = null; Object o = null;/*w w w.j a va 2 s.co m*/ try { // Load the class, return a Class for it c = Class.forName("java.awt.Frame"); // Construct an object, as if new Type() o = c.newInstance(); } catch (Exception e) { System.err.println("That didn't work. " + " Try something else" + e); } if (o != null && o instanceof Frame) { Frame f = (Frame) o; f.setTitle("Testing"); f.setVisible(true); } else throw new IllegalArgumentException("Huh? What gives?"); }
From source file:Main.java
static public void main(String args[]) throws Exception { URL myurl[] = { new URL("file:///C:/CH3/ClassLoader/web/"), new URL("http://www.java2s.edu/~xyx/test/") }; URLClassLoader x = new URLClassLoader(myurl); Class c = x.loadClass("TestURL"); Class getArg1[] = { (new String[1]).getClass() }; Method m = c.getMethod("main", getArg1); String[] my1 = { "arg1 passed", "arg2 passed" }; Object myarg1[] = { my1 };/*from w ww. j av a 2s. c o m*/ m.invoke(null, myarg1); Object ob = c.newInstance(); Class arg2[] = {}; Method m2 = c.getMethod("tt", arg2); m2.invoke(ob, null); Class arg3[] = { (new String()).getClass(), int.class }; Method m3 = c.getMethod("tt", arg3); Object myarg2[] = { "Arg1", new Integer(100) }; m3.invoke(ob, myarg2); }