Question

Java

In a JavaFX application there is a TextField control(tfRadius) for taking input of a circle’s radius. A respective square whose diagonal is the circle's diameter can then be created. There are three other controls in this application: a button(btCalculate), two textareas(trCircleArea, trSquareArea). When the button is clicked, the circle's area is calculated and displayed on trCircleArea, furthermore, the square's area is also calculated and displayed on trSquareArea.

Please write the portions of codes which calculates the circle’s area and the square's area when the button(btCalculate) is clicked and both of the calculated areas are displayed on their respective textarea controls(trCircleArea, trSquareArea).   Assuming the codes for layout setup are completed and you are only required to complete the calculation part and handling of button click event.

Answer 1

Here is the answer for your question in Java Programming Language.

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CODE :

Only button handling event and calculation part

//Button event handing code btCalculate.setOnAction(e->{ //Use a try catch block to catch errors if any try{ //Store text from tfRadius field into a double variable double radius = Double.parseDouble(tfRadius.getText()); //Find diameter,circle area and square area double diameter = 2*radius; double circleArea = 3.14*radius*radius; double squareArea = 0.5*diameter*diameter; //Display them in respected text Areas trCircleArea.setText("Circle Area : " + circleArea); trSquareArea.setText("Square Area : " + squareArea); }catch(Exception ex){ System.out.println("ERROR OCCURED"); }    });

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Complete Code :

import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.TextArea; import javafx.scene.control.TextField; import javafx.scene.layout.GridPane; import javafx.stage.Stage; public class CircleNSquare extends Application{ @Override public void start(Stage primaryStage) throws Exception { //Create required GUI Components Label radLbl = new Label("Enter radius : "); Label circleLbl = new Label("Circle Area : "); Label sqaureLbl = new Label("Square Area : "); TextField tfRadius = new TextField(); Button btCalculate = new Button("Calculate"); TextArea trCircleArea = new TextArea(); TextArea trSquareArea = new TextArea();    //Button event handing code btCalculate.setOnAction(e->{ //Use a try catch block to catch errors if any try{ //Store text from tfRadius field into a double variable double radius = Double.parseDouble(tfRadius.getText()); //Find diameter,circle area and square area double diameter = 2*radius; double circleArea = 3.14*radius*radius; double squareArea = 0.5*diameter*diameter; //Display them in respected text Areas trCircleArea.setText("Circle Area : " + circleArea); trSquareArea.setText("Square Area : " + squareArea); }catch(Exception ex){ System.out.println("ERROR OCCURED"); }    }); //Create a grid pane GridPane pane = new GridPane(); //Set its insets pane.setPadding(new Insets(10));    //Set horizontal and verticak gaps for the Grid pane pane.setHgap(10); pane.setVgap(10);    //Add the GUI components one by one to the pane pane.add(radLbl, 0, 0); pane.add(tfRadius, 1, 0); pane.add(btCalculate, 1, 1); pane.add(circleLbl, 0, 2); pane.add(sqaureLbl, 0, 3); pane.add(trCircleArea, 1, 2); pane.add(trSquareArea, 1, 3);    //Create a scene with the grid pane Scene scene = new Scene(pane); //Attach scene to the current stage primaryStage.setScene(scene); //Set its title and show it primaryStage.setTitle("Calculate Areas of Circle and Square"); primaryStage.show(); } public static void main(String[] args){ launch(args); } }

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SCREENSHOTS :

Please see the screenshots of the code below for the indentations of the code.

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OUTPUT :

Any doubts regarding this can be explained with pleasure :)