public static String get(String key) 
{
        String def = props.getProperty(key);
        try {
            return System.getProperty(key, def);
        } catch (IllegalArgumentException e) {
        } catch (NullPointerException e) {
        }
        return null;
}

Get a networking system property. If no system property was defined returns the default value, if it exists, otherwise returns null.

 public static Boolean getBoolean(String key) 
{
        String val = null;
        try {
            val = System.getProperty(key, props.getProperty(key));
        } catch (IllegalArgumentException e) {
        } catch (NullPointerException e) {
        }
        if (val != null) {
            try {
                return Boolean.valueOf(val);
            } catch (NumberFormatException ex) {
            }
        }
        return null;
}

Get a Boolean networking system property. If no system property was defined returns the default value, if it exists, otherwise returns null.

 public static Integer getInteger(String key,
    int defval) 
{
        String val = null;
        try {
            val = System.getProperty(key, props.getProperty(key));
        } catch (IllegalArgumentException e) {
        } catch (NullPointerException e) {
        }
        if (val != null) {
            try {
                return Integer.decode(val);
            } catch (NumberFormatException ex) {
            }
        }
        return new Integer(defval);
}

Get an Integer networking system property. If no system property was defined returns the default value, if it exists, otherwise returns null.