format Double value as - Java java.text

Java examples for java.text:DecimalFormat

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Description

format Double value as

Demo Code


import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.log4j.Logger;

public class Main{
    public static void main(String[] argv) throws Exception{
        Object o = "java2s.com";
        System.out.println(formatDouble(o));
    }//from w w w . j  a  va  2  s .  c om
    public static double formatDouble(Object o) {
        if (o == null || o.equals("")) {
            return 0;
        }
        String amount = format(o.toString().replace(",", ""));
        return parseToDouble(amount).doubleValue();
    }
    
    public static String format(Object o) {
        if (o == null) {
            return null;
        }
        if ("".equals(o)) {
            return "";
        }
        int d = Integer.valueOf(2);
        String temp = String.valueOf((int) Math.pow(10, d))
                .replace("1", "");
        DecimalFormat format = null;
        if (temp.length() == 0) {
            format = new DecimalFormat("#,##0.#");
        } else {
            format = new DecimalFormat("#,##0." + temp);
        }
        format.setRoundingMode(RoundingMode.HALF_UP);
        return format.format(new BigDecimal(String.valueOf(o)));
    }
    
    public static Double parseToDouble(String amout) {
        if (amout == null)
            return null;
        String s = amout.replaceAll(",", "");
        return Double.valueOf(s);
    }
}

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