Java Utililty Methods Properties Save

FileOutputStream propertiesFile = new FileOutputStream(propertiesFileName);
properties.store(propertiesFile, header);
propertiesFile.flush();
propertiesFile.close();

PrintStream os = new PrintStream(new FileOutputStream(location.getAbsolutePath()));
List<String> keys = new ArrayList<>(props.stringPropertyNames());
Collections.sort(keys);
for (Object key : keys) {
    os.println(key.toString() + " = " + props.get(key).toString());
os.close();

FileOutputStream fos = null;
try {
    fos = new FileOutputStream(fileName);
    properties.store(fos, null);
} catch (FileNotFoundException ex) {
    System.out.println("The server configuration properties file not exists");
} catch (IOException ioe) {
    System.out.println("The property file configuration wrintng error");
...

try {
    FileOutputStream fos = new FileOutputStream(makeFullPathname(fileName));
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    properties.store(bos, title);
    bos.close();
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
...

try {
    FileOutputStream fs = new FileOutputStream(propName);
    props.store(fs, null);
} catch (RuntimeException ex) 
    throw ex;
} catch (IOException ex) 
    throw new IllegalArgumentException("Cannot save properties to " + propName);

if (props == null)
    return null;
return encodeName(savePropertiesToString(props, comment));

if (props == null)
    return null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
props.store(out, comment);
String tmpString = out.toString();
out = null;
return tmpString;

if (mProperties == null)
    mProperties = new Properties();
createFile();
try (OutputStream lOutputStream = new FileOutputStream(FILE_NAME)) {
    mProperties.put(key, value);
    mProperties.store(lOutputStream, null);
} catch (IOException e) {
    throw e;
...

Properties prop = getProperties();
OutputStream output = null;
try {
    output = new FileOutputStream("config.properties");
    prop.setProperty(key, value);
    prop.store(output, null);
} catch (IOException io) {
    io.printStackTrace();
...

Properties properties = loadUserSettings();
properties.setProperty(key, value);
saveUserSettings(properties);