swingNumberGuess.java

// school work
import java.awt.*; //using awt's layouts
import java.awt.event.*; //using awt's event classes and listener interfaces
import javax.swing.*; //using swing's components and container

//a swing application extends from javax.swing.JFrame
public class SwingNumberGuess extends JFrame {
    private JTextField tfNumber, tfGuess;
    private JButton btnGenerate;
    private double number;
    private float guess;
    private Label responseLabel;

    // Constructor to set up UI components and event handlers
    public SwingNumberGuess() {
        // Swing components should be added to the content-pane of the JFrame.
        Container cp = getContentPane();
        // Set this Container to grid layout of 2 rows and 1 columns
        cp.setLayout(new GridLayout(2, 1, 10, 6));

        // Components are added from left-to-right, top-to-bottom
        cp.add(new JLabel("The Number is "));
        tfNumber = new JTextField(10);
        tfNumber.setHorizontalAlignment(JTextField.RIGHT);
        cp.add(tfNumber);

        btnGenerate = new JButton("Generate");
        cp.add(btnGenerate);
        btnGenerate.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent evt) {
                number= (Math.random());
                tfNumber.setText(String.format("%.2f",number ));
                tfNumber.setText("**");
            }
        });
        cp.add(new JLabel("Enter your guess "));
        tfGuess = new JTextField(10);
        tfGuess.setHorizontalAlignment(JTextField.RIGHT);
        cp.add(tfGuess);



        responseLabel = new Label();
        responseLabel.setAlignment(Label.LEFT);
        cp.add(responseLabel);
        tfGuess.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent evt) {
                guess = Float.parseFloat(tfGuess.getText());

                if ( guess > number) {
                    responseLabel.setText("Try Lower");
                }

                else
                if ( guess < number){
                    responseLabel.setText("Try Higher");
                }

                else
                if (guess == number) {
                    responseLabel.setText("You Got It");
                }

            }
        });

        setDefaultCloseOperation(EXIT_ON_CLOSE); // for the "window-close" button
        setTitle("Guess Number");
        setSize(500, 120);
        setVisible(true);
    }


    // The entry main() method
    public static void main(String[] args) {
        // For thread safety, use the event-dispatching thread to construct UI
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new SwingNumberGuess(); // Let the constructor does the job
            }
        });
    }
}