How do I save preference user settings in Java?

For example, I have a window with a preference button. I want to make it so that when user press the preference button and checks his/her appropriate options and press ok, it saves the preference, then when user presses run on the main window, it runs accordingly to preference开发者_高级运维 the user changed on the preference window.

Thank you in advance.

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You can use java.util.prefs package. A simple example:

// Retrieve the user preference node for the package com.mycompany
Preferences prefs = Preferences.userNodeForPackage(com.mycompany.MyClass.class);

// Preference key name
final String PREF_NAME = "name_of_preference";

// Set the value of the preference
String newValue = "a string";
prefs.put(PREF_NAME, newValue);

// Get the value of the preference;
// default value is returned if the preference does not exist
String defaultValue = "default string";
String propertyValue = prefs.get(PREF_NAME, defaultValue); // "a string"

There are many more examples at java2s.com.

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There is a Java Preferences API specifically for this purpose. It lets you store per-user preferences in an easy cross-platform way, while the API itself takes care of where and how to store the data.

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public void saveProperties() {
    try {            
        String USER_NAME = "Some name";
        String DP_ADDRESS = "Some url";
        //create a properties file
        Properties props = new Properties();
        props.setProperty("User name", USER_NAME);
        props.setProperty("Display picture address", DP_ADDRESS);
        File f = new File("YOUR_TARGET_FILE_PATH");
        OutputStream out = new FileOutputStream( f );
        //If you wish to make some comments 
        props.store(out, "User properties");
    }
    catch (Exception e ) {
        e.printStackTrace();
    }
}

You may use java.util.Properties to save your preferences