Solutions to the Try It Out Exercises in Beginning Programming with Java For Dummies, 5th Edition
by Barry Burd

Chapter 20: Oooey GUI Was a Worm

In this chapter:

Mix it up

The order of the statements is somewhat flexible. Here are two constraints: So, for example, you can't use the frame variable before you've declared the frame variable: 
// Bad code:
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JFrame frame = new JFrame();
You shouldn't call the frame object's pack method before you've added the label to the object: 
// Bad code:
frame.pack();
frame.add(label);

Copy text to a text field

Here's the root.fxml file: 
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="199.0" prefWidth="280.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.111" fx:controller="application.Main">
   <children>
      <Button layoutX="111.0" layoutY="73.0" mnemonicParsing="false" onAction="#onClick" text="Copy" />
      <TextField fx:id="textField" layoutX="57.0" layoutY="27.0" />
      <TextField fx:id="textField2" layoutX="57.0" layoutY="123.0" />
   </children>
</AnchorPane>
Here's the Main.java file: 
package application;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.stage.Stage;


public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
            // BorderPane root = new BorderPane();
            Parent root = FXMLLoader.load(getClass().getResource("Root.fxml"));
			Scene scene = new Scene(root,400,400);
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		launch(args);
	}

  @FXML
  private TextField textField, textField2;

  @FXML
  protected void onClick(ActionEvent event) {
    textField2.setText(textField.getText());
  }

}

Copy between text fields

Here's the root.fxml file: 
<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="199.0" prefWidth="280.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.Main">
   <children>
      <Button layoutX="57.0" layoutY="73.0" mnemonicParsing="false" onAction="#onClickCopyDown" text="Copy down" />
      <TextField fx:id="textField" layoutX="57.0" layoutY="27.0" prefHeight="27.0" prefWidth="179.0" />
      <TextField fx:id="textField2" layoutX="57.0" layoutY="123.0" prefHeight="27.0" prefWidth="179.0" />
      <Button layoutX="165.0" layoutY="73.0" mnemonicParsing="false" onAction="#onClickCopyUp" text="Copy up" />
   </children>
</AnchorPane>
Here's the Main.java file: 
package application;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.stage.Stage;


public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
            // BorderPane root = new BorderPane();
            Parent root = FXMLLoader.load(getClass().getResource("Root.fxml"));
			Scene scene = new Scene(root,400,400);
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		launch(args);
	}

  @FXML
  private TextField textField, textField2;

  @FXML
  protected void onClickCopyDown(ActionEvent event) {
    textField2.setText(textField.getText());
  }

  @FXML
  protected void onClickCopyUp(ActionEvent event) {
    textField.setText(textField2.getText());
  }

}

Copy text to a label

Here's the root.fxml file: 
<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="199.0" prefWidth="280.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.Main">
   <children>
      <Button layoutX="111.0" layoutY="73.0" mnemonicParsing="false" onAction="#onClick" text="Copy" />
      <TextField fx:id="textField" layoutX="57.0" layoutY="27.0" />
      <Label fx:id="label" layoutX="66.0" layoutY="131.0" text="New text displayed here" />
   </children>
</AnchorPane>
Here's the Main.java file: 
package application;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.stage.Stage;


public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
            // BorderPane root = new BorderPane();
            Parent root = FXMLLoader.load(getClass().getResource("Root.fxml"));
			Scene scene = new Scene(root,400,400);
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		launch(args);
	}

  @FXML
  private TextField textField;

  @FXML
  private Label label;

  @FXML
  protected void onClick(ActionEvent event) {
    label.setText(textField.getText());
  }

}

Create a small calculator

Here's the root.fxml file: 
<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.Main">
   <children>
      <AnchorPane prefHeight="194.0" prefWidth="331.0">
         <children>
            <TextField fx:id="addend1" layoutX="26.0" layoutY="78.0" prefHeight="27.0" prefWidth="67.0" />
            <Button layoutX="204.0" layoutY="78.0" mnemonicParsing="false" onAction="#onClick" text="=" />
            <TextField fx:id="addend2" layoutX="121.0" layoutY="78.0" prefHeight="27.0" prefWidth="67.0" />
            <Label layoutX="104.0" layoutY="83.0" text="+" />
            <Label fx:id="sum" layoutX="240.0" layoutY="83.0" />
         </children>
      </AnchorPane>
   </children>
</AnchorPane>
Here's the Main.java file: 
package application;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;


public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
			//BorderPane root = new BorderPane();
            Parent root = FXMLLoader.load(getClass().getResource("Root.fxml"));

			Scene scene = new Scene(root,400,400);
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		launch(args);
	}

  @FXML
  private TextField addend1, addend2;
  @FXML
  private Label sum;

  @FXML
  protected void onClick(ActionEvent event) {
    int number1 = Integer.parseInt(addend1.getText());
    int number2 = Integer.parseInt(addend2.getText());
    sum.setText(Integer.toString(number1 + number2));
  }
}