Java Fraction Format format(double no, String formatter)

Description

Formats a number to the specific formatter stirng.

License

Open Source License

Parameter

Parameter	Description
no	a double number.
formatter	number formatter string.

Return

formatted number string.

Declaration

public static String format(double no, String formatter) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.math.BigDecimal;

import java.text.DecimalFormat;

public class Main {
    public static String format(BigDecimal no, String formatter) {
        DecimalFormat df = new DecimalFormat(formatter);
        return df.format(no);
    }//from ww  w . j a  v a 2 s.c om

    /**
     * Formats a number to the specific formatter stirng.
     * 
     * @param no
     *            a number string.
     * @param formatter
     *            number formatter string.
     * @return formatted number string.
     * @exception NumberFormatException
     *                if the no argument is not a number.
     */
    public static String format(String no, String formatter) {
        return format(Double.parseDouble(no), formatter);
    }

    /**
     * Formats a number to the specific formatter stirng.
     * 
     * @param no
     *            a int number.
     * @param formatter
     *            number formatter string.
     * @return formatted number string.
     */
    public static String format(int no, String formatter) {
        return format((long) no, formatter);
    }

    /**
     * Formats a number to the specific formatter stirng.
     * 
     * @param no
     *            a float number.
     * @param formatter
     *            number formatter string.
     * @return formatted number string.
     */
    public static String format(float no, String formatter) {
        return format((double) no, formatter);
    }

    /**
     * Formats a number to the specific formatter stirng.
     * 
     * @param no
     *            a long number.
     * @param formatter
     *            number formatter string.
     * @return formatted number string.
     */
    public static String format(long no, String formatter) {
        DecimalFormat df = new DecimalFormat(formatter);
        return df.format(no);
    }

    /**
     * Formats a number to the specific formatter stirng.
     * 
     * @param no
     *            a double number.
     * @param formatter
     *            number formatter string.
     * @return formatted number string.
     */
    public static String format(double no, String formatter) {
        DecimalFormat df = new DecimalFormat(formatter);
        return df.format(no);
    }

    /**
     * Returns a new <code>double</code> initialized to the value represented
     * by the specified <code>String</code>.
     * 
     * If the string argument is null or empty or not a number(
     * <code>NumberFormatException<code> occur),
     * return default value argument.
     *      *
     * @param value a string.
     * @param defaultValue default value.
     * @return the <code>double</code> represented by the argument.
     */
    public static double parseDouble(String value, double defaultValue) {
        try {
            return (value == null || value.equals("")) ? defaultValue : Double.parseDouble(value);
        } catch (NumberFormatException e) {
            return defaultValue;
        }
    }

    /**
     * Returns a new <code>double</code> initialized to the value represented
     * by the specified <code>String</code>.
     * 
     * If the string argument is null or empty or not a number(
     * <code>NumberFormatException<code> occur),
     * return -1.0.
     *      *
     * @param value a string.
     * @return the <code>double</code> represented by the argument.
     */
    public static double parseDouble(String value) {
        return parseDouble(value, -1.0);
    }
}

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