Example usage for java.lang Math random

Introduction

In this page you can find the example usage for java.lang Math random.

Prototype

public static double random()

Source Link

Document

Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0 .

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    String[] items = new String[50];
    for (int i = 0; i < items.length; i++) {
        items[i] = "" + Math.random();
    }//from   w w  w  .j av  a2  s  .com
    JComboBox cb = new JComboBox(items);

    // Retrieve the current max visible rows
    int maxVisibleRows = cb.getMaximumRowCount();

    // Change the current max visible rows
    maxVisibleRows = 20;
    cb.setMaximumRowCount(maxVisibleRows);

}

From source file:MainClass.java

public static void main(String[] arg) {
    long[][][] beans = new long[5][10][30];

    for (int i = 0; i < beans.length; i++) {
        for (int j = 0; j < beans[i].length; j++) {
            beans[i][j] = new long[(int) (1.0 + 6.0 * Math.random())];
        }/*from   w ww .ja  va2 s.com*/
    }
}

From source file:Main.java

public static void main(String args[]) {
    double limits[] = { 0.0, 0.1, 0.3, 0.7 };
    String labels[] = { "very low", "low", "moderate", "high" };
    ChoiceFormat format = new ChoiceFormat(limits, labels);
    double r = Math.random();

    System.out.println(format.format(r) + " (" + r + ").");
}

From source file:Random1.java

public static void main(String[] argv) {
    //+/* ww  w .  j  a  v a  2s  .c om*/
    // java.lang.Math.random() is static, don't need to construct Math
    System.out.println("A random from java.lang.Math is " + Math.random());
    //-
}

From source file:MessageFormatApp.java

public static void main(String args[]) {
    String pattern = "The time is {0,time} and ";
    pattern += "your lucky number is {1,number}.";
    MessageFormat format = new MessageFormat(pattern);
    Object objects[] = { new Date(), new Integer((int) (Math.random() * 1000)) };
    String formattedOutput = format.format(objects);
    System.out.println(formattedOutput);
}

From source file:Main.java

public static void main(String[] args) {
    ForkJoinPool fjPool = new ForkJoinPool();
    int[] a = new int[3333344];
    for (int i = 0; i < a.length; i++) {
        int k = (int) (Math.random() * 22222);
        a[i] = k;//from   www .ja v  a  2 s .com
    }
    ForkJoinQuicksortTask forkJoinQuicksortTask = new ForkJoinQuicksortTask(a, 0, a.length - 1);
    long start = System.nanoTime();
    fjPool.invoke(forkJoinQuicksortTask);
    System.out.println("Time: " + (System.nanoTime() - start));
}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> list = new ArrayList<>();
    long expectedSum = 0;
    for (int i = 0; i < 10000; i++) {
        int random = 1 + (int) (Math.random() * ((100 - 1) + 1));
        list.add(random);//from w ww.  jav a 2 s  .  co  m
        expectedSum += random;
    }
    System.out.println("expected sum: " + expectedSum);
    ForkJoinPool forkJoinPool = new ForkJoinPool(Runtime.getRuntime().availableProcessors());
    RecursiveSum recursiveSum = new RecursiveSum(list, 0, list.size());
    long recSum = forkJoinPool.invoke(recursiveSum);
    System.out.println("recursive-sum: " + recSum);
}

From source file:ItemSet.java

public static void main(String args[]) {
    String names[] = { "Item 1", "Item 2", "Item 3" };
    Set moons = new HashSet();
    int namesLen = names.length;
    int index;/*from ww  w .j av  a2 s . com*/
    for (int i = 0; i < 100; i++) {
        index = (int) (Math.random() * namesLen);
        moons.add(names[index]);
    }
    Iterator it = moons.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
    System.out.println("---");
    Set orderedMoons = new TreeSet(moons);
    it = orderedMoons.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
}

From source file:Main.java

public static void main(String[] args) {
    ArrayList<String> list = new ArrayList<>();
    list.add("A");
    list.add("B");
    list.add("C");
    list.add("D");
    list.add("E");
    list.add("F");
    list.add("G");
    list.add("H");

    System.out.println(list);/*  w  ww . j a  v a 2  s.co m*/

    while (!list.isEmpty()) {
        long index = Math.round(Math.floor(Math.random() * list.size()));
        System.out.println("Name " + list.get((int) index));
        list.remove((int) index);
    }

}

From source file:RandomBounds.java

public static void main(String[] args) {
    if (args.length != 1)
        usage();//from www.j a  v  a  2  s  . c  o m
    if (args[0].equals("lower")) {
        while (Math.random() != 0.0)
            ; // Keep trying
        System.out.println("Produced 0.0!");
    } else if (args[0].equals("upper")) {
        while (Math.random() != 1.0)
            ; // Keep trying
        System.out.println("Produced 1.0!");
    } else
        usage();
}