[toby]

I have a coding problem... and if someone can help me finish it.. it would be grateful...
I can't make the numbers to respond to the answers...... and follow the image says...

Code:

Code:

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class TriangleArea extends Applet implements ActionListener {

    private Label lblInstructions, lblSideA, lblSideB, lblSideC,
                  lblSelect, lblAngles, lblArea, lblRightAngle;
    private TextField txtSideA, txtSideB, txtSideC;
    private Button btnCM, btnM, btnKM;
    double[] angles = new double[3];
    double radians;
    
    public void init() {
        setLayout(null);
        setupGUIComponents();
        final int WIDTH = 470, HEIGHT = 220;
        setSize(WIDTH, HEIGHT);
    }
    
    public void actionPerformed(ActionEvent ae) {
        String command = ae.getActionCommand();
        
        lblAngles.setText("Three angles are "+angles[0]+"degree, "+angles[1]+"degree and "+angles[2]+"degree");
        lblArea.setText("Area of the triangle is "+command);
        lblRightAngle.setText("It is a "+command+" triangle");
    }

    private void setupGUIComponents() {
        
        // initiaze the components
        lblInstructions = new Label("Enter the length of the sides of a triangle");
        lblSideA = new Label("a");  txtSideA = new TextField(5);
        lblSideB = new Label("b");  txtSideB = new TextField(5);
        lblSideC = new Label("c");  txtSideC = new TextField(5);
        lblSelect = new Label("Select unit:");
        btnCM = new Button("cm"); btnM = new Button("m"); btnKM = new Button("km");
        lblAngles = new Label();
        lblArea = new Label();
        lblRightAngle = new Label();

        // add action-listeners to the buttons
        btnCM.addActionListener(this); 
        btnM.addActionListener(this);
        btnKM.addActionListener(this);

        // allign the components to the frame
        lblInstructions.setBounds(100,10,250,20);
        lblSideA.setBounds(100,35,20,20); txtSideA.setBounds(220,35,115,20);
        lblSideB.setBounds(100,55,20,20); txtSideB.setBounds(220,55,115,20);
        lblSideC.setBounds(100,75,20,20); txtSideC.setBounds(220,75,115,20);
        lblSelect.setBounds(130,100,70,20);
        btnCM.setBounds(210,100,30,20); 
        btnM.setBounds(245,100,30,20);
        btnKM.setBounds(280,100,30,20);
        lblAngles.setBounds(20,140,410,20);
        lblArea.setBounds(20,165,410,20);
        lblRightAngle.setBounds(20,190,410,20);
        
        // add the components to the frame
        add(lblInstructions);
        add(lblSideA);  add(txtSideA);
        add(lblSideB);  add(txtSideB);
        add(lblSideC);  add(txtSideC);
        add(lblSelect); add(btnCM); add(btnM); add(btnKM);
        add(lblAngles); add(lblArea); add(lblRightAngle);
    }
    
    private double[] getAngles(int a, int b, int c)
    {
        // create an array to store the 3 angles
        double[] angles = new double[3];
        double radians;

        // cast all the int values to double
        double dA=(double)a, dB=(double)b, dC=(double)c;
        
        // angle A in radians = cos^-1 (b^2 + c^2 - a^2 / 2bc)
        // and then convert the radians to degrees
        radians = Math.acos((dB*dB + dC*dC - dA*dA) / (2.0*dB*dC));
        angles[0] = radians * 180.0 / Math.PI;
        
        // angle B in radians = cos^-1 (a^2 + c^2 - b^2 / 2ac)
        // and then convert the radians to degrees
        radians = Math.acos((dA*dA + dC*dC - dB*dB) / (2.0*dA*dC));
        angles[1] = radians * 180.0 / Math.PI;
        
        // angle C in degrees = 180 - degrees A - degrees B
        angles[2] = 180.0 - angles[0] - angles[1];

        // return the 3 angles
        return angles;
    }
    
}

When i try to input the numbers into the textfield....
No number came out to the output....
If anyway.... can help to complete the java code...??
Thanks