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I need to write a program that prompts the user to enter 4 numbers (x1, x2, y1, y2) and the program should output the circles area, diameter, circumference, and area. I have to create these methods, distance, radius, circumference and area.

I have the code done but everytime i enter the numbers, nothing gets computed and nothing happens...can anybody help me with this?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;



public class Circle extends JFrame {
   
   // declare variables
   private double radius = 0, circ = 0, diameter = 0, area = 0, distance = 0; 
   private double X1, X2, Y1, Y2;
   private ButtonHandler buttonHandler;

   
   // declare GUI components
   JLabel lX1, lX2, lY1, lY2, lWelcome, lRadius, lCirc, lDiameter, lArea;
   JTextField tX1, tX2, tY1, tY2, tRadius, tCirc, tDiameter, tArea;
   JButton bReset, bCompute;
   Container c;
   JPanel pCenter;
   
   //set and get methods
   public double distance (double X1, double X2, double Y1, double Y2)
   {
   	distance =  Math.sqrt((X2 - X1) * (X2 - X1) + (Y2 - Y1) * (Y2 - Y1));
   	return distance;
   }

   public double radius (double X1, double Y1, double X2, double Y2)
   {
	return distance(X1, Y1, X2, Y2);
   }

   public double circ (double radius)
   {
	circ = 2*Math.PI * radius;
	return circ;
   }

   public double area (double radius)
   {
	area = Math.PI * radius * radius; 
	return area;
   }   
   {
	   	 //create GUI components
         lX1 = new JLabel("Enter X1:");
         lX2 = new JLabel("Enter X2:");
         lY1 = new JLabel("Enter Y1:");
         lY2 = new JLabel("Enter Y2:");
         lRadius = new JLabel("Radius =");
         lCirc = new JLabel("Circumference =");
         lDiameter = new JLabel("Diameter =");
         lArea = new JLabel("Area =");
         lWelcome = new JLabel("Circle", SwingConstants.CENTER);
         
         tX1 = new JTextField("");
         tX2 = new JTextField("");
         tY1 = new JTextField("");
         tY2 = new JTextField("");
         tRadius = new JTextField("");
         tCirc = new JTextField("");
         tDiameter = new JTextField("");
         tArea = new JTextField("");
         
         tX1.setEditable(true);
         tX2.setEditable(true);
         tY1.setEditable(true);
         tY2.setEditable(true);
         tRadius.setEditable(false);
         tCirc.setEditable(false);
         tDiameter.setEditable(false);
         tArea.setEditable(false);
           
         bReset = new JButton("Reset");
         bCompute = new JButton("Compute");
         
         c = getContentPane();
         pCenter = new JPanel();
   }

   public Circle() {
         //add GUI components
         pCenter.setLayout(new GridLayout(9,2));
         pCenter.add(lX1);
         pCenter.add(tX1);
         pCenter.add(lX2);
         pCenter.add(tX2);
         pCenter.add(lY1);
         pCenter.add(tY1);
         pCenter.add(lY2);
         pCenter.add(tY2);
         pCenter.add(lRadius);
         pCenter.add(tRadius);
         pCenter.add(lCirc);
         pCenter.add(tCirc);
         pCenter.add(lDiameter);
         pCenter.add(tDiameter);
         pCenter.add(lArea);
         pCenter.add(tArea);
         pCenter.add(bReset);
         pCenter.add(bCompute);
         
         c.setLayout(new BorderLayout());
         c.add(lWelcome, BorderLayout.NORTH);
         c.add(pCenter, BorderLayout.CENTER);
         
         //register with buttons
         buttonHandler = new ButtonHandler();
         bReset.addActionListener(buttonHandler);
         bCompute.addActionListener(buttonHandler);
         
         //render the window
         setTitle("Circle Info");
         setSize(500, 300);
         setLocation(100, 100);
         setResizable(false);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setVisible(true);
   }
   
   private class ButtonHandler implements ActionListener {
      public void actionPerformed(ActionEvent ae) {
         if (ae.getSource().equals(bReset)) {
            tX1.setText("");
            tX2.setText("");
            tY1.setText("");
            tY2.setText("");
            tRadius.setText("");
            tCirc.setText("");
            tDiameter.setText("");
            tArea.setText("");
         }
         else {
             try {
               X1 = Double.parseDouble(tX1.getText());
               X2 = Double.parseDouble(tX2.getText());
               Y1 = Double.parseDouble(tY1.getText());
               Y2 = Double.parseDouble(tY2.getText());
               radius = Double.parseDouble(tRadius.getText());
               circ = Double.parseDouble(tCirc.getText());
               diameter = Double.parseDouble(tDiameter.getText());
               area = Double.parseDouble(tArea.getText());
               
               tRadius.setText(distance(X1, X2, Y1, Y2) + "");
               tCirc.setText(circ(radius) + "");
               tArea.setText(area(radius) + "");
               
             
             }
              
              catch (Exception e) {
                   JOptionPane.showMessageDialog(null, "Invalid input, please try again");
                   return;
                 }
         }
      }    
   }
 public static void main(String[] args) {
       Circle myApp = new Circle();
   } 
   }
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7 Years
Discussion Span
Last Post by gangsta1903
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You set these fields non-editable.

tRadius.setEditable(false);
tCirc.setEditable(false);
tDiameter.setEditable(false);
tArea.setEditable(false);

But then you try to get the values from these fields.

radius = Double.parseDouble(tRadius.getText());
circ = Double.parseDouble(tCirc.getText());
diameter = Double.parseDouble(tDiameter.getText());
area = Double.parseDouble(tArea.getText());

I think you use these fields for showing output, thus you made them non-editable.

You should first calculate radius, circ,diameter,area and then set these fields with the computed values.

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