Processing config file loader and UI

ConfigLoaderUI.pde

import controlP5.*;

SettingsManager sm;
ControlP5 cp5;

boolean visible;
float speed;

void setup() {
   size(400, 400);
   
   cp5 = new ControlP5(this);
   
   // In a real context this file would live in the data folder
   sm = new SettingsManager("settings.json");
   
   visible = sm.getSettings().getBoolean("visible");
   speed = sm.getSettings().getFloat("speed");
   
   cp5.addToggle("visible").setValue(visible);
   cp5.addSlider("speed")
     .setMax(1.0)
     .setMin(0.0)
     .setValue(speed);
   cp5.addButton("Save");
   
}

void draw() {}

void visible(boolean val) {
  sm.getSettings().setBoolean("visible", val);
}

void speed(float val) {
 sm.getSettings().setFloat("speed", val);
}

void Save() {
  // Saves to file
  sm.saveSettings();
}

settings.json

{
  "visible": false,
  "speed": 0.5252525210380554
}

SettingsManager.pde

import java.util.Iterator;

class SettingsManager {
  
  String filePath;
  JSONObject settings;
  
  SettingsManager(String path) {
    this.setFilepath(path);
    this.loadSettings();
  }
  
  void setFilepath(String path) {
    this.filePath = path;
  }
  
  void loadSettings() {
    this.settings = loadJSONObject(this.filePath);
    
    println("Settings loaded\n");
    
   
    Iterator iterator = this.settings.keyIterator();
    
    while (iterator.hasNext()) {
      String key = (String)iterator.next();
      println("\t" + key + ": " +  this.settings.get(key));
    }
  }
  
  JSONObject getSettings() {
    return this.settings;
  }
  
  void saveSettings() {
    saveJSONObject(this.settings, this.filePath);
  }
}