Question

please help me debug this

Create a GUI for an application that lets the user calculate the hypotenuse of a right triangle.

Use the Pythagorean Theorem to calculate the length of the third side. The Pythagorean Theorem states that the square of the hypotenuse of a right-triangle is equal to the sum of the squares of the opposite sides:

alidate the user input so that the user must enter a double value for side A and B of the triangle. To do that, you can use the Validation class presented in chapter 18 to validate the user’s input.

package hypotenuse;
import javax.swing.*;
import java.awt.*;
import java.lang.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Hypotenuse extends JFrame implements ActionListener{
   private JFrame F = new JFrame("Calculate Hypoteneus");

   private JTextField N1 = new JTextField(10);
   private JTextField N2 = new JTextField(10);
   private JTextField Result = new JTextField(10);

   private JLabel A = new JLabel("Side A");
   private JLabel B = new JLabel("Side B");
   private JLabel C1 = new JLabel("Side C(hypoteneus)");

   private JButton Add = new JButton("Solve Hypoteneus");
   private JButton Add1 = new JButton("Solve");
   private JButton Add2 = new JButton("Clear");

   public Hypotenuse()
   {
       JPanel P = new JPanel();
    
       P.setlayout(new FlowLayout(FlowLayout.CENTER, 20,10));
       P.add(A);
       P.add(N1);
       P.add(B);
       P.add(N2);
       P.add(c1);
       Result.setEditable(false);
       P.add(Result);
    
       JPanel P1 = new JPanel();
       P1.setlayout(new FlowLayout());
       P1.add(Add, BorderLayout.EAST);
       P1.add(Add1, BorderLayout.EAST);
       P1.add(Add2, BorderLayout.EAST);
       P1.add(new JButton("Cancel"),BorderLayout.EAST);
       Add.addActionListener(this);
       Add1.addActionListener(this);
       Add2.addActionListener(this);
    
       F.setlayout(new BorderLayout());
       F.add(P, BorderLayout.CENTER);
       F.add(P, BorderLayout.SOUTH);
       F.setVisible(true);
       F.setSize(700,150);
    
       }
       public void actionPerformed(ActionEvent e){
    
           if(e.getSource()==Add)
           {
               double Num1 = (Double.parseDouble(N1.getText()));
               double Num2 = (Double.parseDouble(N2.getText()));
            
               double R = (Num1 * Num1) + (Num2 * Num2);
               R = Math.sqrt(R);
            
               Result.setText(String.valueOf(R));
               N1.setText(String.valueOf(Num1*Num1));
               N2.setText(String.valueOf(Num2*Num2));
            
               N1.setEditable(false);
               N2.setEditable(false);
            
           }
           if(e.getSource()==Add2)
           {
               N1.setEditable(true);
               N2.setEditable(true);
            
               N1.setText(null);
               N2.setText(null);
               Result.setText(null);
           }
       }
       public static void main(String args[])
       {
           new Hypotenuse();
       }
            
   }            
}             

Answer 1

Answer:

You had few mistakes

• P.setlayout instead of P.setLayout in multiple places wherever you are called setLayout()
• P.add(c1) instead of P.add(C1)

Please find the screen of program execution and the corrected code below

Hypotenuse.java

import javax.swing.*;
import java.awt.*;
import java.lang.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Hypotenuse extends JFrame implements ActionListener{
    private JFrame F = new JFrame("Calculate Hypoteneus");

    private JTextField N1 = new JTextField(10);
    private JTextField N2 = new JTextField(10);
    private JTextField Result = new JTextField(10);

    private JLabel A = new JLabel("Side A");
    private JLabel B = new JLabel("Side B");
    private JLabel C1 = new JLabel("Side C(hypoteneus)");

    private JButton Add = new JButton("Solve Hypoteneus");
    private JButton Add1 = new JButton("Solve");
    private JButton Add2 = new JButton("Clear");

    public Hypotenuse()
    {
        JPanel P = new JPanel();
        P.setLayout(new FlowLayout(FlowLayout.CENTER, 20,10));
        P.add(A);
        P.add(N1);
        P.add(B);
        P.add(N2);
        P.add(C1);
        Result.setEditable(false);
        P.add(Result);

        JPanel P1 = new JPanel();
        P1.setLayout(new FlowLayout());
        P1.add(Add, BorderLayout.EAST);
        P1.add(Add1, BorderLayout.EAST);
        P1.add(Add2, BorderLayout.EAST);
        P1.add(new JButton("Cancel"),BorderLayout.EAST);
        Add.addActionListener(this);
        Add1.addActionListener(this);
        Add2.addActionListener(this);

        F.setLayout(new BorderLayout());
        F.add(P, BorderLayout.CENTER);
        F.add(P, BorderLayout.SOUTH);
        F.setVisible(true);
        F.setSize(700,150);

    }
    public void actionPerformed(ActionEvent e){

        if(e.getSource()==Add)
        {
            double Num1 = (Double.parseDouble(N1.getText()));
            double Num2 = (Double.parseDouble(N2.getText()));

            double R = (Num1 * Num1) + (Num2 * Num2);
            R = Math.sqrt(R);

            Result.setText(String.valueOf(R));
            N1.setText(String.valueOf(Num1*Num1));
            N2.setText(String.valueOf(Num2*Num2));

            N1.setEditable(false);
            N2.setEditable(false);

        }
        if(e.getSource()==Add2)
        {
            N1.setEditable(true);
            N2.setEditable(true);

            N1.setText(null);
            N2.setText(null);
            Result.setText(null);
        }
    }
    public static void main(String args[])
    {
        new Hypotenuse();
    }

}

Thank you,

Good Luck !!!