Example usage for java.lang System arraycopy

Introduction

In this page you can find the example usage for java.lang System arraycopy.

Prototype

@HotSpotIntrinsicCandidate
public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length);

Source Link

Document

Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.

Usage

From source file:TableSetDataEvent.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Table table = new Table(shell, SWT.BORDER | SWT.VIRTUAL);
    table.addListener(SWT.SetData, new Listener() {
        public void handleEvent(Event e) {
            System.out.println(e);
            TableItem item = (TableItem) e.item;
            int index = table.indexOf(item);
            item.setText("Item " + data[index]);
        }/*w  w  w.j  av  a2  s  . com*/
    });
    int count = 0;
    Random random = new Random();
    while (count++ < 50) {
        int grow = 10;
        int[] newData = new int[data.length + grow];
        System.arraycopy(data, 0, newData, 0, data.length);
        int index = data.length;
        data = newData;
        for (int j = 0; j < grow; j++) {
            data[index++] = random.nextInt();
        }

        table.setItemCount(data.length);
        table.clearAll();
    }
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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From source file:org.eclipse.swt.snippets.Snippet151.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 151");
    shell.setLayout(new FillLayout());
    final Table table = new Table(shell, SWT.BORDER | SWT.VIRTUAL);
    table.addListener(SWT.SetData, e -> {
        TableItem item = (TableItem) e.item;
        int index = table.indexOf(item);
        item.setText("Item " + data[index]);
    });//w ww  . j  a v a  2  s  .  c  o m
    Thread thread = new Thread() {
        @Override
        public void run() {
            int count = 0;
            Random random = new Random();
            while (count++ < 500) {
                if (table.isDisposed())
                    return;
                // add 10 random numbers to array and sort
                int grow = 10;
                int[] newData = new int[data.length + grow];
                System.arraycopy(data, 0, newData, 0, data.length);
                int index = data.length;
                data = newData;
                for (int j = 0; j < grow; j++) {
                    data[index++] = random.nextInt();
                }
                Arrays.sort(data);
                display.syncExec(() -> {
                    if (table.isDisposed())
                        return;
                    table.setItemCount(data.length);
                    table.clearAll();
                });
                try {
                    Thread.sleep(500);
                } catch (Throwable t) {
                }
            }
        }
    };
    thread.start();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:boa.BoaMain.java

public static void main(final String[] args) throws IOException {
    final Options options = new Options();

    options.addOption("p", "parse", false, "parse and semantic check a Boa program (don't generate code)");
    options.addOption("c", "compile", false, "compile a Boa program");
    options.addOption("e", "execute", false, "execute a Boa program locally");
    options.addOption("g", "generate", false, "generate a Boa dataset");

    try {//  w ww.  j  a v a2  s  . c  o  m
        if (args.length == 0) {
            printHelp(options, null);
            return;
        } else {
            final CommandLine cl = new PosixParser().parse(options, new String[] { args[0] });
            final String[] tempargs = new String[args.length - 1];
            System.arraycopy(args, 1, tempargs, 0, args.length - 1);

            if (cl.hasOption("c")) {
                boa.compiler.BoaCompiler.main(tempargs);
            } else if (cl.hasOption("p")) {
                boa.compiler.BoaCompiler.parseOnly(tempargs);
            } else if (cl.hasOption("e")) {
                boa.evaluator.BoaEvaluator.main(tempargs);
            } else if (cl.hasOption("g")) {
                boa.datagen.BoaGenerator.main(tempargs);
            }
        }
    } catch (final org.apache.commons.cli.ParseException e) {
        printHelp(options, e.getMessage());
    }
}

---

From source file:Ch7_Images.java

public static void main(String[] args) {
    int numRows = 6, numCols = 11, pix = 20;
    PaletteData pd = new PaletteData(
            new RGB[] { new RGB(0x00, 0x00, 0x00), new RGB(0x80, 0x80, 0x80), new RGB(0xFF, 0xFF, 0xFF) });

    ImageData[] flagArray = new ImageData[3];
    for (int frame = 0; frame < flagArray.length; frame++) {
        flagArray[frame] = new ImageData(pix * numCols, pix * numRows, 4, pd);
        flagArray[frame].delayTime = 10;
        for (int x = 0; x < pix * numCols; x++) {
            for (int y = 0; y < pix * numRows; y++) {
                int value = (((x / pix) % 3) + (3 - ((y / pix) % 3)) + frame) % 3;
                flagArray[frame].setPixel(x, y, value);
            }//from   www . jav  a2  s. c  o  m
        }
    }

    ImageLoader gifloader = new ImageLoader();
    ByteArrayOutputStream flagByte[] = new ByteArrayOutputStream[3];
    byte[][] gifarray = new byte[3][];
    gifloader.data = flagArray;

    for (int i = 0; i < 3; i++) {
        flagByte[i] = new ByteArrayOutputStream();
        flagArray[0] = flagArray[i];
        gifloader.save(flagByte[i], SWT.IMAGE_GIF);
        gifarray[i] = flagByte[i].toByteArray();
    }

    byte[] gif = new byte[4628];
    System.arraycopy(gifarray[0], 0, gif, 0, 61);
    System.arraycopy(new byte[] { 33, (byte) 255, 11 }, 0, gif, 61, 3);
    System.arraycopy("NETSCAPE2.0".getBytes(), 0, gif, 64, 11);
    System.arraycopy(new byte[] { 3, 1, -24, 3, 0, 33, -7, 4, -24 }, 0, gif, 75, 9);
    System.arraycopy(gifarray[0], 65, gif, 84, 1512);

    for (int i = 1; i < 3; i++) {
        System.arraycopy(gifarray[i], 61, gif, 1516 * i + 80, 3);
        gif[1516 * i + 83] = (byte) -24;
        System.arraycopy(gifarray[i], 65, gif, 1516 * i + 84, 1512);
    }

    try {
        DataOutputStream in = new DataOutputStream(
                new BufferedOutputStream(new FileOutputStream(new File("FlagGIF.gif"))));
        in.write(gif, 0, gif.length);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new BouncyCastleProvider());
    SecureRandom random = new SecureRandom();
    IvParameterSpec ivSpec = createCtrIvForAES(1, random);
    Key key = createKeyForAES(256, random);
    Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
    String input = "www.java2s.com";
    Mac mac = Mac.getInstance("DES", "BC");
    byte[] macKeyBytes = "12345678".getBytes();
    Key macKey = new SecretKeySpec(macKeyBytes, "DES");
    System.out.println("input : " + input);

    // encryption step
    cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
    byte[] cipherText = new byte[cipher.getOutputSize(input.length() + mac.getMacLength())];
    int ctLength = cipher.update(input.getBytes(), 0, input.length(), cipherText, 0);
    mac.init(macKey);//from   ww  w.j a  va 2  s. c o  m
    mac.update(input.getBytes());
    ctLength += cipher.doFinal(mac.doFinal(), 0, mac.getMacLength(), cipherText, ctLength);
    System.out.println("cipherText : " + new String(cipherText));

    // decryption step
    cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
    byte[] plainText = cipher.doFinal(cipherText, 0, ctLength);
    int messageLength = plainText.length - mac.getMacLength();

    mac.init(macKey);
    mac.update(plainText, 0, messageLength);

    byte[] messageHash = new byte[mac.getMacLength()];
    System.arraycopy(plainText, messageLength, messageHash, 0, messageHash.length);

    System.out.println("plain : " + new String(plainText) + " verified: "
            + MessageDigest.isEqual(mac.doFinal(), messageHash));
}

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From source file:com.rover12421.shaka.cli.Main.java

public static void main(String[] args) throws Exception {
    boolean smali = false;
    boolean baksmali = false;

    String[] realyArgs = args;/*from  w  ww  .j a v  a2  s.c  om*/

    if (args.length > 0) {
        String cmd = args[0];
        if (cmd.equalsIgnoreCase("s") || cmd.equalsIgnoreCase("smali")) {
            smali = true;
        } else if (cmd.equalsIgnoreCase("bs") || cmd.equalsIgnoreCase("baksmali")) {
            baksmali = true;
        }

        if (smali || baksmali) {
            realyArgs = new String[args.length - 1];
            System.arraycopy(args, 1, realyArgs, 0, realyArgs.length);
        }
    }

    // cli parser
    CommandLineParser parser = new IgnoreUnkownArgsPosixParser();
    CommandLine commandLine;

    Option language = CommandLineArgEnum.LANGUAGE.getOption();

    Options options = new Options();
    options.addOption(language);

    try {
        commandLine = parser.parse(options, args, false);
        if (CommandLineArgEnum.LANGUAGE.hasMatch(commandLine)) {
            String lngStr = commandLine.getOptionValue(CommandLineArgEnum.LANGUAGE.getOpt());
            Locale locale = Locale.forLanguageTag(lngStr);
            if (locale.toString().isEmpty()) {
                lngStr = lngStr.replaceAll("_", "-");
                locale = Locale.forLanguageTag(lngStr);
            }
            MultiLanguageSupport.getInstance().setLang(locale);
        }
    } catch (Exception ex) {
    }

    if (smali) {
        smaliMainAj.setHookMain(ApktoolMainAj.getHookMain());
        org.jf.smali.main.main(realyArgs);
    } else if (baksmali) {
        baksmaliMainAj.setHookMain(ApktoolMainAj.getHookMain());
        org.jf.baksmali.main.main(realyArgs);
    } else {
        brut.apktool.Main.main(realyArgs);
    }
}

---

From source file:org.eclipse.swt.snippets.Snippet80.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Snippet 80");
    shell.setLayout(new FillLayout());
    final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI);
    for (int i = 0; i < 2; i++) {
        TreeItem item = new TreeItem(tree, SWT.NONE);
        item.setText("item " + i);
        for (int j = 0; j < 2; j++) {
            TreeItem subItem = new TreeItem(item, SWT.NONE);
            subItem.setText("item " + j);
            for (int k = 0; k < 2; k++) {
                TreeItem subsubItem = new TreeItem(subItem, SWT.NONE);
                subsubItem.setText("item " + k);
            }//from   w  w w  .  ja  va  2s.c om
        }
    }

    tree.addSelectionListener(widgetSelectedAdapter(e -> {
        TreeItem[] selection = tree.getSelection();
        TreeItem[] revisedSelection = new TreeItem[0];
        for (int i = 0; i < selection.length; i++) {
            String text = selection[i].getText();
            if (text.indexOf('1') > 0) {
                TreeItem[] newSelection = new TreeItem[revisedSelection.length + 1];
                System.arraycopy(revisedSelection, 0, newSelection, 0, revisedSelection.length);
                newSelection[revisedSelection.length] = selection[i];
                revisedSelection = newSelection;
            }
        }
        tree.setSelection(revisedSelection);
    }));

    shell.setSize(300, 300);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:jetbrains.exodus.util.ForkedProcessRunner.java

@SuppressWarnings({ "HardcodedFileSeparator" })
public static void main(String[] args) throws Exception {
    log.info("Process started. Arguments: " + Arrays.toString(args));
    if (args.length < 2) {
        exit("Arguments do not contain port number and/or class to be run. Exit.", null);
    }//from   www . j  a va  2 s.  co m
    try {
        int port = Integer.parseInt(args[0]);
        socket = new Socket("localhost", port);
        streamer = new Streamer(socket);
    } catch (NumberFormatException e) {
        exit("Failed to parse port number: " + args[0] + ". Exit.", null);
    }
    ForkedLogic forkedLogic = null;
    try {
        Class<?> clazz = Class.forName(args[1]);
        forkedLogic = (ForkedLogic) clazz.getConstructor().newInstance();
    } catch (Exception e) {
        exit("Failed to instantiate or initialize ForkedLogic descendant", e);
    }
    // lets provide the peer with our process id
    streamer.writeString(getProcessId());
    String[] realArgs = new String[args.length - 2];
    System.arraycopy(args, 2, realArgs, 0, realArgs.length);
    forkedLogic.forked(realArgs);
}

---

From source file:Blobs.java

public static void main(String args[]) {
    if (args.length != 1) {
        System.err.println("Syntax: <java Blobs [driver] [url] " + "[uid] [pass] [file]");
        return;/*from w w w . j av a 2 s.  co  m*/
    }
    try {
        Class.forName(args[0]).newInstance();
        Connection con = DriverManager.getConnection(args[1], args[2], args[3]);
        File f = new File(args[4]);
        PreparedStatement stmt;

        if (!f.exists()) {
            // if the file does not exist
            // retrieve it from the database and write it to the named file
            ResultSet rs;

            stmt = con.prepareStatement("SELECT blobData " + "FROM BlobTest " + "WHERE fileName = ?");

            stmt.setString(1, args[0]);
            rs = stmt.executeQuery();
            if (!rs.next()) {
                System.out.println("No such file stored.");
            } else {
                Blob b = rs.getBlob(1);
                BufferedOutputStream os;

                os = new BufferedOutputStream(new FileOutputStream(f));
                os.write(b.getBytes(0, (int) b.length()), 0, (int) b.length());
                os.flush();
                os.close();
            }
        } else {
            // otherwise read it and save it to the database
            FileInputStream fis = new FileInputStream(f);
            byte[] tmp = new byte[1024];
            byte[] data = null;
            int sz, len = 0;

            while ((sz = fis.read(tmp)) != -1) {
                if (data == null) {
                    len = sz;
                    data = tmp;
                } else {
                    byte[] narr;
                    int nlen;

                    nlen = len + sz;
                    narr = new byte[nlen];
                    System.arraycopy(data, 0, narr, 0, len);
                    System.arraycopy(tmp, 0, narr, len, sz);
                    data = narr;
                    len = nlen;
                }
            }
            if (len != data.length) {
                byte[] narr = new byte[len];

                System.arraycopy(data, 0, narr, 0, len);
                data = narr;
            }
            stmt = con.prepareStatement("INSERT INTO BlobTest(fileName, " + "blobData) VALUES(?, ?)");
            stmt.setString(1, args[0]);
            stmt.setObject(2, data);
            stmt.executeUpdate();
            f.delete();
        }
        con.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:biospectra.BioSpectra.java

/**
 * @param args the command line arguments
 *//*from  w  ww.  j a  v  a 2  s .co m*/
public static void main(String[] args) throws Exception {
    if (args.length < 1) {
        printHelp();
        return;
    }

    String programMode = args[0];
    String[] programArgs = new String[args.length - 1];
    System.arraycopy(args, 1, programArgs, 0, args.length - 1);

    if (programMode.equalsIgnoreCase("i") || programMode.equalsIgnoreCase("index")) {
        System.out.println("Indexing...");
        CommandArgumentsParser<CommandArgumentIndex> parser = new CommandArgumentsParser<CommandArgumentIndex>();
        CommandArgumentIndex indexArg = new CommandArgumentIndex();
        if (!parser.parse(programArgs, indexArg)) {
            return;
        }

        index(indexArg);
    } else if (programMode.equalsIgnoreCase("lc") || programMode.equalsIgnoreCase("lclassify")) {
        System.out.println("Classifying (LOCAL mode)...");
        CommandArgumentsParser<CommandArgumentLocalClassifier> parser = new CommandArgumentsParser<CommandArgumentLocalClassifier>();
        CommandArgumentLocalClassifier classifierArg = new CommandArgumentLocalClassifier();
        if (!parser.parse(programArgs, classifierArg)) {
            return;
        }

        classifyLocal(classifierArg);
    } else if (programMode.equalsIgnoreCase("rc") || programMode.equalsIgnoreCase("rclassify")) {
        System.out.println("Classifying (REMOTE mode)...");
        CommandArgumentsParser<CommandArgumentClassifierClient> parser = new CommandArgumentsParser<CommandArgumentClassifierClient>();
        CommandArgumentClassifierClient clientArg = new CommandArgumentClassifierClient();
        if (!parser.parse(programArgs, clientArg)) {
            return;
        }

        classifyRemote(clientArg);
    } else if (programMode.equalsIgnoreCase("svr") || programMode.equalsIgnoreCase("server")) {
        System.out.println("Running a classification server...");
        CommandArgumentsParser<CommandArgumentServer> parser = new CommandArgumentsParser<CommandArgumentServer>();
        CommandArgumentServer serverArg = new CommandArgumentServer();
        if (!parser.parse(programArgs, serverArg)) {
            return;
        }

        runServer(serverArg);
    } else if (programMode.equalsIgnoreCase("simulate")) {
        System.out.println("Generating simulated reads...");
        simulateReads(programArgs);
    } else {
        printHelp();
    }
}

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