how to store hashmap data to file java code example

Example: save map to file java

// Save map in file
Map<String, String> map = new HashMap<String, String>();
Properties properties = new Properties();

for (Map.Entry<String,String> entry : map.entrySet()) {
    properties.put(entry.getKey(), entry.getValue());
}

properties.store(new FileOutputStream("data.properties"), null);

// Load the map
Map<String, String> map_from_file = new HashMap<String, String>();
Properties properties = new Properties();
properties.load(new FileInputStream("data.properties"));

for (String key : properties.stringPropertyNames()) {
   map_from_file.put(key, properties.get(key).toString());
}