Example usage for java.util Random Random

Introduction

In this page you can find the example usage for java.util Random Random.

Prototype

public Random(long seed) 

Source Link

Document

Creates a new random number generator using a single long seed.

Usage

From source file:Main.java

public static void main(String args[]) {

    Random randomno = new Random(1234567890987655L);

    // get next next pseudorandom value 
    int value = randomno.nextInt();

    // check the value  
    System.out.println("Value is: " + value);
}

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From source file:Main.java

public static void main(String[] args) {
    long[] numbers = new long[] { 1, 2, 3, 4, 5 };
    Random id = new Random(numbers.length);

    String[] name = new String[] { "a", "b", "c", "d", "e" };

    for (int i = 0; i < numbers.length; i++) {
        int randomPosition = id.nextInt(4);
        long temp = numbers[i];
        numbers[i] = numbers[randomPosition];
        numbers[randomPosition] = temp;/*from w w w . ja v a 2s  .  c  om*/
    }

    for (int i = 0; i < name.length; i++) {
        int randomPosition = id.nextInt(4);
        String temp = name[i];
        name[i] = name[randomPosition];
        name[randomPosition] = temp;
    }
    for (int i = 0; i < numbers.length; i++) {
        System.out.println(i + " ID = " + numbers[i] + " and name = " + name[i]);
    }
}

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From source file:MainClass.java

public static void main(String args[]) {
    Random generator = new Random(100);

    System.out.println("First generator:");
    for (int i = 0; i < 10; i++)
        System.out.println(generator.nextInt());

}

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From source file:MainClass.java

public static void main(String args[]) {
    String s[] = { "A", "B", "C", "D", "E", "H", "I" };
    List list1 = Arrays.asList(s);
    List list2 = Arrays.asList(s);
    Random rand = new Random(100);
    Collections.shuffle(list1, rand);
    Collections.shuffle(list2, rand);
    System.out.println(list1);//from  ww  w  . ja va 2 s.  c om
    System.out.println(list2);
}

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From source file:ShuffleTest.java

public static void main(String args[]) {
    String simpsons[] = { "Bart", "Hugo", "Lisa", "Marge", "Homer", "Maggie", "Roy" };
    List list1 = Arrays.asList(simpsons);
    List list2 = Arrays.asList(simpsons);
    Random rand = new Random(100);
    Collections.shuffle(list1, rand);
    Collections.shuffle(list2, rand);
    System.out.println(list1);/*w w w  .ja  v  a2s .  c  o m*/
    System.out.println(list2);
}

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From source file:MainClass.java

public static void main(String args[]) {
    Object array = Array.newInstance(int.class, 3);

    int length = Array.getLength(array);
    Random generator = new Random(System.currentTimeMillis());
    for (int i = 0; i < length; i++) {
        int random = generator.nextInt();
        Array.setInt(array, i, random);
    }//from   w  ww . ja va 2 s  . com

    for (int i = 0; i < length; i++) {
        int value = Array.getInt(array, i);
        System.out.println("Position: " + i + ", value: " + value);
    }
}

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From source file:it.units.malelab.sse.Main.java

public static void main(String[] args) throws IOException {
    Random random = new Random(1);
    VirtualMachine vm = new VirtualMachine(4, 4, 400);
    List<Map<Boolean, List<String>>> datasets = new ArrayList<>();
    datasets.add(Util.loadStrings("/home/eric/Documenti/esperimenti/datasets/Bills-Date.txt", random));
    datasets.add(Util.loadStrings("/home/eric/Documenti/esperimenti/datasets/Log-IP.txt", random));
    datasets.add(Util.loadStrings("/home/eric/Documenti/esperimenti/datasets/Twitter-URL.txt", random));

    Evaluator evaluator = new Evaluator(vm, datasets, 1, 10);

    MyGeneticAlgorithm ga = new MyGeneticAlgorithm(new OnePointCrossover<Integer>(), 0.2, new BinaryMutation(),
            0.6, new TournamentSelection(10), evaluator);
    MyGeneticAlgorithm.setRandomGenerator(new JDKRandomGenerator(1));

    List<Chromosome> chromosomes = new ArrayList<>();
    for (int i = 0; i < 2000; i++) {
        chromosomes.add(new OperationsChromosome(evaluator));
    }/*from  w w  w . j  a va  2s.co m*/
    Population population = new ElitisticListPopulation(chromosomes, chromosomes.size(), 0.99);
    Population finalPopulation = ga.evolve(population, new FixedGenerationCount(10000));
    List<Operation> operations = ((OperationsChromosome) finalPopulation.getFittestChromosome())
            .getOperations();
    for (int i = 0; i < operations.size(); i++) {
        System.out.printf("%4d: %s\n", i, operations.get(i));
    }

}

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From source file:org.eclipse.swt.snippets.Snippet375.java

public static void main(String[] args) throws Exception {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Snippet 375");
    shell.setLayout(new GridLayout(1, false));

    final StringBuilder sb = new StringBuilder();
    final Random random = new Random(2546);
    for (int i = 0; i < 200; i++) {
        sb.append("Very very long text about ").append(random.nextInt(2000)).append("\t");
        if (i % 10 == 0) {
            sb.append("\n");
        }//from w  w  w .j av  a  2s  . c  o  m
    }

    // H SCROLL
    final Label lbl1 = new Label(shell, SWT.NONE);
    lbl1.setLayoutData(new GridData(GridData.BEGINNING, GridData.CENTER, true, false));
    lbl1.setText("Horizontal Scroll");

    final StyledText txt1 = new StyledText(shell, SWT.MULTI | SWT.BORDER | SWT.H_SCROLL);
    txt1.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true));
    txt1.setText(sb.toString());
    txt1.setMouseNavigatorEnabled(true);

    // V_SCROLL
    final Label lbl2 = new Label(shell, SWT.NONE);
    lbl2.setLayoutData(new GridData(GridData.BEGINNING, GridData.CENTER, true, false));
    lbl2.setText("Vertical Scroll");

    final StyledText txt2 = new StyledText(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL);
    txt2.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true));
    txt2.setText(sb.toString());
    txt2.setMouseNavigatorEnabled(true);

    // H SCROLL & V_SCROLL
    final Label lbl3 = new Label(shell, SWT.NONE);
    lbl3.setLayoutData(new GridData(GridData.BEGINNING, GridData.CENTER, true, false));
    lbl3.setText("Horizontal and Vertical Scroll");

    final StyledText txt3 = new StyledText(shell, SWT.MULTI | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    txt3.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true));

    txt3.setText(sb.toString());
    txt3.setMouseNavigatorEnabled(true);

    final Button enableDisableButton = new Button(shell, SWT.PUSH);
    enableDisableButton.setLayoutData(new GridData(GridData.END, GridData.FILL, true, false));
    enableDisableButton.setText("Disable Mouse Navigation");
    enableDisableButton.addListener(SWT.Selection, e -> {
        if (txt3.getMouseNavigatorEnabled()) {
            enableDisableButton.setText("Enable Mouse Navigation");
        } else {
            enableDisableButton.setText("Disable Mouse Navigation");
        }
        txt3.setMouseNavigatorEnabled(!txt3.getMouseNavigatorEnabled());
    });

    // Disabled Scroll at start
    final Label lbl4 = new Label(shell, SWT.NONE);
    lbl4.setLayoutData(new GridData(GridData.BEGINNING, GridData.CENTER, true, false));
    lbl4.setText("No scroll at start");

    final StyledText txt4 = new StyledText(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    final GridData gd = new GridData(GridData.FILL, GridData.FILL, true, true);
    gd.minimumHeight = 100;
    txt4.setLayoutData(gd);

    txt4.setText("Disabled scroll");
    txt4.setMouseNavigatorEnabled(true);

    // Disabled Scroll
    final Label lbl5 = new Label(shell, SWT.NONE);
    lbl5.setLayoutData(new GridData(GridData.BEGINNING, GridData.CENTER, true, false));
    lbl5.setText("No scroll");

    final StyledText txt5 = new StyledText(shell, SWT.MULTI | SWT.BORDER);
    final GridData gd5 = new GridData(GridData.FILL, GridData.FILL, true, true);
    gd5.minimumHeight = 100;
    txt5.setLayoutData(gd5);

    txt5.setText("No scroll");
    txt5.setMouseNavigatorEnabled(true);

    shell.setSize(800, 600);
    shell.open();

    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }

    display.dispose();
}

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From source file:com.dianping.dpsf.other.echo.EchoClient.java

/**
 * @param args//from w ww.  ja  v  a  2s  . c o  m
 * @throws Exception 
 */
public static void main(String[] args) throws Exception {
    PigeonClientMock.setServiceAddress("127.0.0.1:20001,127.0.0.1:20002");
    ApplicationContext ctx = new ClassPathXmlApplicationContext("echo-client.xml");
    IEcho s = (IEcho) ctx.getBean("echo");
    //      System.out.println(s.echo("aa"));
    //      Thread.sleep(3000);
    //      System.out.println(s.echo("aa"));
    //      System.out.println("firing");
    Random rnd = new Random(System.currentTimeMillis());

    List<String[]> hostList = new ArrayList<String[]>();
    hostList.add(new String[] { "127.0.0.1", "20001", "1" });
    PigeonClientMock.getSc().onServiceHostChange("http://service.dianping.com/echoService", hostList);

    int i = 0;
    while (i < 100) {
        try {
            System.out.println(s.echo("aa"));
        } catch (Exception e) {
            System.out.println("EEEEEEEEEEEEEEEEEEEEEEE");
        }
        Thread.sleep(2000);
        if (i == 1) {
            System.out.println("+++++++++++++++++++adding 20002++++++++++++++++");
            hostList = new ArrayList<String[]>();
            hostList.add(new String[] { "127.0.0.1", "20001", "1" });
            hostList.add(new String[] { "127.0.0.1", "20002", "1" });
            PigeonClientMock.getSc().onServiceHostChange("http://service.dianping.com/echoService", hostList);
        }
        if (i == 5) {
            System.out.println("+++++++++++++++++++adding 20003++++++++++++++++");
            hostList = new ArrayList<String[]>();
            hostList.add(new String[] { "127.0.0.1", "20001", "1" });
            hostList.add(new String[] { "192.168.32.111", "20003", "1" });
            PigeonClientMock.getSc().onServiceHostChange("http://service.dianping.com/echoService", hostList);
        }
        if (i == 10) {
            System.out.println("--------------------change wt------------");
            PigeonClientMock.getSc().onHostWeightChange("127.0.0.1", 2);
        }
        i++;
    }

}

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From source file:Main.java

public static void main(String[] args) {
    int maximum = 100;
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Integer[] oneRow = { 0, 0, 0, 0 };
    String[] headers = { "A", "B", "C", "D" };
    Integer[][] data = { oneRow, oneRow, oneRow, oneRow, oneRow, };
    DefaultTableModel model = new DefaultTableModel(data, headers);
    JTable table = new JTable(model);
    table.setDefaultRenderer(Object.class, new ProgressRenderer(0, maximum));
    table.setPreferredScrollableViewportSize(table.getPreferredSize());
    frame.add(new JScrollPane(table));
    frame.pack();/* w ww .j a  va  2  s .  c  o m*/
    frame.setVisible(true);
    new Thread(new Runnable() {
        @Override
        public void run() {
            Object waiter = new Object();
            synchronized (waiter) {
                int rows = model.getRowCount();
                int columns = model.getColumnCount();
                Random random = new Random(System.currentTimeMillis());
                boolean done = false;
                while (!done) {
                    int row = random.nextInt(rows);
                    int column = random.nextInt(columns);
                    Integer value = (Integer) model.getValueAt(row, column);
                    value++;
                    if (value <= maximum) {
                        model.setValueAt(value, row, column);
                        try {
                            waiter.wait(15);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    done = true;
                    for (row = 0; row < rows; row++) {
                        for (column = 0; column < columns; column++) {
                            if (!model.getValueAt(row, column).equals(maximum)) {
                                done = false;
                                break;
                            }
                        }
                        if (!done) {
                            break;
                        }
                    }
                }
            }
        }
    }).start();
}

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