EncodingDecodingTool/
├── src/
│   ├── main/
│   │   ├── java/
│   │   │   └── com/
│   │   │       └── rockmelodies/
│   │   │           └── encodingdecodingtool/
│   │   │               ├── MainApp.java
│   │   │               ├── controller/
│   │   │               │   └── MainController.java
│   │   │               └── util/
│   │   │                   └── CryptoUtils.java
│   │   └── resources/
│   │       └── com/
│   │           └── rockmelodies/
│   │               └── encodingdecodingtool/
│   │                   └── view/
│   │                       ├── main_layout.fxml
│   │                       └── styles.css
└── pom.xml

# MainApp.java
package com.rockmelodies.encodingdecodingtool;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;public class MainApp extends Application {@Overridepublic void start(Stage primaryStage) throws Exception {Parent root = FXMLLoader.load(getClass().getResource("/com/rockmelodies/encodingdecodingtool/view/main_layout.fxml"));primaryStage.setTitle("Encoding & Decoding Tool");primaryStage.setScene(new Scene(root));primaryStage.show();}public static void main(String[] args) {launch(args);}
}

# CryptoUtils.java
package com.rockmelodies.encodingdecodingtool;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;public class MainApp extends Application {@Overridepublic void start(Stage primaryStage) throws Exception {Parent root = FXMLLoader.load(getClass().getResource("/com/rockmelodies/encodingdecodingtool/view/main_layout.fxml"));primaryStage.setTitle("Encoding & Decoding Tool");primaryStage.setScene(new Scene(root));primaryStage.show();}public static void main(String[] args) {launch(args);}
}

# MainController
package com.rockmelodies.encodingdecodingtool.controller;import javafx.fxml.FXML;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import com.rockmelodies.encodingdecodingtool.util.CryptoUtils;public class MainController {@FXMLprivate TextField inputField;@FXMLprivate TextArea outputArea;@FXMLprivate void handleBase64Encode() {String input = inputField.getText();String encoded = CryptoUtils.base64Encode(input);outputArea.setText(encoded);}@FXMLprivate void handleBase64Decode() {String input = inputField.getText();String decoded = CryptoUtils.base64Decode(input);outputArea.setText(decoded);}public void switchTheme(String theme) {Scene scene = inputField.getScene();scene.getStylesheets().clear();scene.getStylesheets().add(getClass().getResource("/com/rockmelodies/encodingdecodingtool/view/" + theme + ".css").toExternalForm());}// Add more handlers for other encoding/decoding and encryption/decryption methods
}

main_layout.fxml

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?><VBox xmlns:fx="http://javafx.com/fxml" fx:controller="com.rockmelodies.encodingdecodingtool.controller.MainController"><TextField fx:id="inputField" promptText="Enter text here..."/><Button text="Base64 Encode" onAction="#handleBase64Encode"/><Button text="Base64 Decode" onAction="#handleBase64Decode"/><!-- Add more buttons for other encoding/decoding and encryption/decryption methods --><TextArea fx:id="outputArea" editable="false" promptText="Output will appear here..."/>
</VBox>

styless.css

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?><VBox xmlns:fx="http://javafx.com/fxml" fx:controller="com.rockmelodies.encodingdecodingtool.controller.MainController"><TextField fx:id="inputField" promptText="Enter text here..."/><Button text="Base64 Encode" onAction="#handleBase64Encode"/><Button text="Base64 Decode" onAction="#handleBase64Decode"/><!-- Add more buttons for other encoding/decoding and encryption/decryption methods --><TextArea fx:id="outputArea" editable="false" promptText="Output will appear here..."/>
</VBox>