Example usage for java.lang Number doubleValue

Introduction

In this page you can find the example usage for java.lang Number doubleValue.

Prototype

public abstract double doubleValue();

Source Link

Document

Returns the value of the specified number as a double .

Usage

From source file:Main.java

public static void main(String[] args) {
    System.out.println("Enter a number.");
    double numberFromConsole;
    try {/*from   w w  w  . ja  v a2 s.  c  o  m*/
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        String s = br.readLine();
        DecimalFormat df = new DecimalFormat();
        Number n = df.parse(s);
        numberFromConsole = n.doubleValue();
    } catch (IOException e) {
        numberFromConsole = 0;
    } catch (ParseException e) {
        numberFromConsole = 0;
    }
    System.out.println(numberFromConsole);
}

From source file:Main.java

public static void main(String[] args) {
    // Parse a string to decimal number
    String str = "qq1,234.567";
    String pattern = "#,###.###";
    formatter.applyPattern(pattern);// w w w . jav  a2 s  .c o  m

    // Create a ParsePosition object to specify the first digit of
    // number in the string. It is 1 in "qq1,234.567"
    // with the index 2.
    ParsePosition pp = new ParsePosition(2);

    Number numberObject = formatter.parse(str, pp);

    double value = numberObject.doubleValue();
    System.out.println("Parsed Value  is " + value);
}

From source file:Main.java

public static void main(String[] args) {
    DecimalFormat format = new DecimalFormat("####.##");
    format.setMinimumFractionDigits(2);/*from   w ww .j  a va 2  s.c  om*/
    final JFormattedTextField field1 = new JFormattedTextField(format);
    final JFormattedTextField field2 = new JFormattedTextField(format);
    field1.setColumns(15);
    field2.setColumns(15);
    JButton btn = new JButton(new AbstractAction("Multiply by 2") {

        @Override
        public void actionPerformed(ActionEvent e) {
            Number value = (Number) field1.getValue();
            if (value != null) {
                field2.setValue(2 * value.doubleValue());
            }
        }
    });

    JPanel panel = new JPanel();
    panel.add(field1);
    panel.add(btn);
    panel.add(field2);
    JOptionPane.showMessageDialog(null, panel);
}

From source file:Main.java

public static void main(String[] args) {

    // get a number as integer
    Number x = new Integer(123456);

    // get a number as float
    Number y = new Float(9876f);

    // print their value as double
    System.out.println("x as integer :" + x + ", x as double:" + x.doubleValue());
    System.out.println("y as float::" + y + ", y as double:" + x.doubleValue());

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Number number = NumberFormat.getNumberInstance(Locale.JAPAN).parse("25,000.75");
    if (number instanceof Long) {
        System.out.println("Long value: " + number.longValue());
    } else if (number instanceof Double) {
        System.out.println("Double value: " + number.doubleValue());
    }//from   ww w .  j  a  v  a 2  s .c  o m
}

From source file:Main.java

public static double[] toDoubleArray(Collection<? extends Number> c) {
    double arr[] = new double[c.size()];
    int i = 0;//from   w  ww. j a v  a2  s  .  c o  m
    for (Number item : c) {
        arr[i++] = item.doubleValue();
    }
    return arr;
}

From source file:Main.java

/**
 * @param nums Any descendant of Number (Integer, Short, Double, Float, etc)
 * @return The mean of the number, or Double.NaN if the list is empty.
 *//*w ww.  ja v  a  2s . c om*/
public static double mean(Collection<? extends Number> nums) {
    if (nums == null || nums.isEmpty()) {
        return Double.NaN;
    }
    double sum = 0.0;
    for (Number n : nums) {
        sum += n.doubleValue();
    }
    return sum / nums.size();
}

From source file:Main.java

/**
 * @param coll {@link Collection} any collection object containing zero or more elements,can't be null.
 * @return {@link Number} the maximum value available in the collection.
 *//*from   w w w .ja v a2s.c om*/
public static Number max(Collection<? extends Number> coll) {
    Iterator<? extends Number> i = coll.iterator();
    Number candidate = i.next();
    while (i.hasNext()) {
        Number next = i.next();
        if (next.doubleValue() - candidate.doubleValue() > 0)
            candidate = next;
    }
    return candidate;
}

From source file:Main.java

public static double sum(Collection<? extends Number> collection) {
    double result = 0;
    for (Number number : collection) {
        result += number.doubleValue();
    }/*  ww w  . j a v  a2 s.  c o  m*/

    return result;
}

From source file:Main.java

public static double[] toDoubleArray(Collection<? extends Number> c) {
    double arr[] = new double[c.size()];
    int i = 0;/*from ww  w  .  j  a  v a  2 s.com*/
    for (Number item : c)
        arr[i++] = item.doubleValue();
    return arr;
}