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An open source pure Java JDBC Driver implementation which allows Java developers and JDBC client programs (e.g., Open Office, Libre Office, Squirrel SQL) to read/write Microsoft Access databases.

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package net.ucanaccess.converters;

import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.HashMap;
import java.util.Map;

public final class FormatCache {
    private static DecimalFormat noArgs;
    private static DecimalFormat zpzz;
    private static DecimalFormat sharp;
    private static DecimalFormat noGrouping;

    private static final Map CACHE = new HashMap();

    private FormatCache() {
    }

    public static synchronized DecimalFormat getDecimalFormat(String _pattern) {
        if (!CACHE.containsKey(_pattern)) {
            DecimalFormat dc = new DecimalFormat(_pattern);
            dc.setRoundingMode(RoundingMode.HALF_UP);
            CACHE.put(_pattern, dc);
        }
        return CACHE.get(_pattern);
    }

    public static DecimalFormat getNoArgs() {
        if (noArgs == null) {
            noArgs = new DecimalFormat();
        }
        return noArgs;
    }

    public static DecimalFormat getZpzz() {
        if (zpzz == null) {
            zpzz = new DecimalFormat("0.00");
            zpzz.setRoundingMode(RoundingMode.HALF_UP);
        }
        return zpzz;
    }

    public static DecimalFormat getSharp() {
        if (sharp == null) {
            sharp = new DecimalFormat("###,###.##");
        }
        return sharp;
    }

    public static DecimalFormat getNoGrouping() {
        if (noGrouping == null) {
            noGrouping = new DecimalFormat();
            noGrouping.setGroupingUsed(false);
        }
        return noGrouping;
    }
}