Java Utililty Methods Properties Save

FileOutputStream propertiesStream = new FileOutputStream(fname);
PrintStream os = new PrintStream(propertiesStream);
os.println("# " + comment);
os.println();
List<String> keys = new ArrayList<String>();
for (Object c : p.keySet())
    keys.add((String) c);
Collections.sort(keys);
...

return saveProps(new File(path), props);

try (FileOutputStream fout = new FileOutputStream(file)) {
    Properties sorted = new Properties() {
        @Override
        public Set<Object> keySet() {
            return Collections.unmodifiableSet(new TreeSet<Object>(super.keySet()));
        @Override
        public synchronized Enumeration<Object> keys() {
...

File sysdirPropsFile = new File(classpathDirectory, "sipxconfig.properties");
FileOutputStream sysdirPropsStream;
try {
    sysdirPropsStream = new FileOutputStream(sysdirPropsFile);
    sysProps.store(sysdirPropsStream, null);
} catch (FileNotFoundException e) {
    throw new RuntimeException("could not create system dir properties file", e);
} catch (IOException e) {
...

try {
    FileOutputStream fileOutput = new FileOutputStream(fileName);
    OutputStreamWriter writer = new OutputStreamWriter(fileOutput, "ISO-8859-1");
    Enumeration propNames = prop.propertyNames();
    List keys = new ArrayList();
    while (propNames.hasMoreElements()) {
        keys.add(propNames.nextElement());
    Collections.sort(keys);
    for (int i = 0; i < keys.size(); i++) {
        String key = (String) keys.get(i);
        writer.write(key);
        writer.write(" = ");
        writer.write(prop.getProperty(key));
        writer.write("\n");
    writer.flush();
    writer.close();
    fileOutput.close();
} catch (FileNotFoundException e) {
    throw new RuntimeException(e);
} catch (IOException e) {
    throw new RuntimeException("Unexpected exception! caused by: " + e.getMessage(), e);

String filename = System.getProperty("user.home") + File.separator + ".RacePoint.xml";
OutputStream out = null;
try {
    out = new FileOutputStream(filename);
    BufferedOutputStream outBuf = new BufferedOutputStream(out);
    properties.storeToXML(outBuf, "User settings for RacePoint");
    outBuf.close();
} catch (IOException e) {
...

StringWriter outputWriter = new StringWriter();
properties.store(outputWriter, "");
String rst = outputWriter.toString();
outputWriter.close();
return rst;

ByteArrayOutputStream baos = new ByteArrayOutputStream();
props.store(baos, null);
return baos.toString();