Problem 2

/**
 * PROBLEM *
 A Java developer wants to save a few user settings such as
 volume_level = 3, theme_color = green, username = John.
 Now, a database would be too heavy to save just these few values.
 Assess this situation and suggest an alternative approach to save these values.
 Provide code for your suggestion.
 **/

/**
 * SOLUTION *
 A user defined data type like 'class' may could be a good choice for saving user settings values.
 As each users' data is well structured. So each user's data can be identified easier than saving in a list.

 Here's a simple demonstration...
 **/
class UserSettings {
    public Integer volumeLevel;
    public String themeColor;
    public String username;

    // Default Constructor
    public UserSettings () {}

    // Parameterized Constructor
    public UserSettings(Integer volumeLevel, String themeColor, String username) {
        this.volumeLevel = volumeLevel;
        this.themeColor = themeColor;
        this.username = username;
    }

    public void printAttributes() {
        System.out.println("volume_level = " + this.volumeLevel);
        System.out.println("theme_color  = " + this.themeColor);
        System.out.println("username = " + this.username);
        System.out.println("\n");
    }

}

public class Problem2 {

    public static void main(String[] args) {
        UserSettings user1 = new UserSettings(3, "green", "John");
        System.out.println("User settings for user 1:");
        user1.printAttributes();

        UserSettings user2 = new UserSettings();
        user2.username = "Alex";
        user2.themeColor = "red";
        user2.volumeLevel = 5;
        System.out.println("User settings for user 2:");
        user2.printAttributes();
    }

}