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Is it possible to create a new properties file and add keys and values in run time? I want to add new keys to properties file depending on user input while installing my application. I checked out Java Properties class but it seem it can set values to existing keys but can not add new keys to properties file.
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properties file. Instantiate the Properties class. Populate the created Properties object using the put() method. Instantiate the FileOutputStream class by passing the path to store the file, as a parameter.
Create a properties fileRight-click and select Add New Properties File. A new properties file will be added to your project. The new file will be selected and highlighted in the list. Type a name for your properties file, for example, "Properties".
To set properties in a Java Properties instance you use the setProperty() method. Here is an example of setting a property (key - value pair) in a Java Properties object: properties.
You can add new properties just by calling setProperty with a key which doesn't currently exist. That will only do it in memory though - you'll have to call store again to reflect the changes back to a file:
Properties prop = new Properties();
prop.load(...); // FileInputStream or whatever
prop.setProperty("newKey", "newValue");
prop.store(...); // FileOutputStream or whatever
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