Thread: I am not sure what else do I need to complete it

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
 
/**
 * The Geometry DEMO
 * 
 * @author Luis Fierro
 * @version 4/1/2014
 */
public class GeometryCalculatorDemo extends JFrame
{
    private JPanel panel;             //a holding panel
    private JLabel messageLabel;      // a message to the user
    private JLabel textLabel1;        //show what radius, length or base depending on user choice
    private JLabel textLabel2;        //shows width or height depending on user choice
    private JTextField measurement1Text;
    private JTextField measurement2Text;
    private JRadioButton circButton;
    private JRadioButton rectButton;
    private JRadioButton triButton;
    private JRadioButton endButton;
    private ButtonGroup radioButtonGroup;    
    private final int WINDOW_WIDTH = 400;
    private final int WINDOW_HEIGHT = 100;
 
 
    /**
     * Constructor for objects of class GeometryCalculator
     */
    public static void main (String []args)
    {
        // initialise instance variables
        char again; //do I run again
        int choice; //find out what to calculate
 
        do
        {
            switch( e.getSource())
            {
                case circButton:
                        textLabel1.setText("Enter the radius");
                        circle();
                        break;
                case rectButton:  rectangle();
                        break;
                case triButton:   triangle();
                        break;
                case endButton: JOptionPane.showMessageDialog(null, "Bye-bye!!");
                        break;
            }
        } while (choice !=4);
 
    }
 
    /**
     * 
     */
    public void getMenuChoice()
    {
        //set the title
        setTitle ("Geometry Calculator");
        //set the size of the window
        setSize (WINDOW_WIDTH, WINDOW_HEIGHT);
        //actions for the close button
        setDefaultCloseOperation(JFrane.EXIT_ON_CLOSE);
        //build a pane
        buildPane();
        //add the pane to the frame
        add(panel);
        //show window
        setVisible(true);
    }
    private void buildPane()
    {
        messageLabel=new JLabel("Select a shape to calculate the area: ");
        textLabel1=new JLabel("");
        textLabel2=new JLabel("");
        measurement1Text= new JTextField(4);
        measurement2Text= new JTextField(4);
        circButton=new JRadioButton("Circle");
        rectButton=new JRadioButton("Rectangle");
        triButton=new JRadioButton("Triangle");
        endButton=new JRadioButton("End Program");
 
        //group the buttons
       radioButtonGroup= new ButtonGroup();
       radioButtonGroup.add(circButton);
       radioButtonGroup.add(rectButton);
       radioButtonGroup.add(triButton);       
       radioButtonGroup.add(endtButton);
 
 
    }    
 
    public static void circle()
    {
            double rad;
            String input;
 
          input = measurement1Text.getText;
          rad = Double.parseDouble(input);
          JOptionPane.showMessageDialog(null, Geometry.circArea(rad));               
    }
 
    public static void rectangle()
    {
             double len;
             double wid;
             String input;
             String input2;
 
           input = measurement1Text.getText;
           leng = Double.parseDouble(input);
           input2 = measurement2Text.getText;
           wid = Double.parseDouble(input2);
           JOptionPane.showMessageDialog(null, Geometry.rectArea(len,wid));
 
    }
 
    public static void triangle()
    {
             double base;
             double heig;
             String input;
             String input2;
 
           input =  measurement1Text.getText;
           base = Double.parseDouble(input);
           input2 = measurement2Text.getText;
           heig = Double.parseDouble(input2);
           JOptionPane.showMessageDialog(null, Geometry.triArea(base, heig));
 
    }
 
}

I'm supposed to write a code where the class has static methods: to accept radius and calculate area, accept length and with to calculate a rectangle's area, and accept base and height for a triangle's area. It should display error if there are negatives values

Then I need to write a program to test the class, displaying the following menu:
Geometry Calculator

1. Calculate the area of a circle
2. Calculate the area of a rectangle
3. Calculate the area of a triangle
4. Quit

Enter your choice (1-4): Display error if numbers out of 1-4 range

I was thinking that my class should be close to this: but still I don't know how to state the calculations because it says <identifier> expected

public class GeometryCalculator
 { 
 
 
    public static double circArea
            (double r);
    {
 
        {
            return Math.PI*r*r;
 
        }
    }   
 
    public static double rectArea
            (double len, wid);
    {
 
        {
            return l*w;
        }               
    }
 
    public static double triArea
            (double base,heig);
    {
 
        {
            return h*b*0.5;
        }
 
    }
  }

Also in my first code says error where e.getSource saying that is wasn't declared

--- Update ---

Never mind I figured it out everything, still thanks!!

When you declare a method each parameter must be given a type. There are some instances where you did not specify a type like

public static double triArea
           (double base,heig);
{
    {
          return h*b*0.5;
    }
}

As I said earlier, both parameters must have types

public static double triArea(double base, double heig)

Also, you are using different variable names throughout the methods
If you define the variable base, and heig, your program does not know what h or b are. You have to use consistent names.

I wasn't completely focused in the code thanks, I saw what I had wrong