Question

Write a JavaFx program for addition of two numbers. (create text as Number1, Number2 and Result and create 3 textfileds. Create sum button. You have to enter number1 and number2 in the textfileds. If you click the button Sum, the result will be showed in the third text field.

Answer 1

package practice;  
/* -> Simple calculation: Addition of two numbers using javafx in eclipse
-> Save file name as Calculation.java*/
import javafx.application.Application; 
import javafx.event.ActionEvent;  
import javafx.event.EventHandler;   
import javafx.scene.Scene;  
import javafx.scene.control.Button;  
import javafx.scene.control.Label;  
import javafx.scene.control.TextField;  
import javafx.scene.layout.GridPane;  
import javafx.stage.Stage;
public class Main extends Application {
        
@Override  
public void start(Stage primaryStage) throws Exception {  
        // TODO Auto-generated method stub  
        Label number1=new Label("Number 1 :");  //Label 1
        Label number2 = new Label("Number 2 :"); //Label 2
        Label result = new Label("Result :"); //Label 3 
        TextField num1=new TextField();  //text field 1
        TextField num2=new TextField(); //text field 2
        TextField res=new TextField(); //text field 3
        Button sumButton = new Button("Sum");
        //Add event listener to sumButton
        sumButton.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
                Double d1=Double.parseDouble(num1.getText()); //getting the entered in nuber1 textfield and changed to double
                Double d2=Double.parseDouble(num2.getText());//getting the entered in nuber2 textfield and changed to double
                res.setText(Double.toString(d1+d2)); //set the text to the result textfiled as adddition of two numbers
        }
        }); 
        /* Adding all Ui elements to root */
        GridPane root = new GridPane();  
        root.addRow(0, number1, num1);  
        root.addRow(1, number2, num2);
        root.addRow(2, result, res); 
        root.addRow(3, sumButton);  
        //Scene creation
        Scene scene=new Scene(root,500,300);  
        primaryStage.setScene(scene);  
        primaryStage.setTitle("Simple Calculation");  
        primaryStage.show();  
}
/* Main Method */
public static void main(String[] args) {  
        launch(args);     
}

}