94 lines
2.5 KiB
Java
94 lines
2.5 KiB
Java
import java.awt.GridLayout;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.awt.event.KeyEvent;
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import java.awt.event.KeyListener;
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import javax.swing.JButton;
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import javax.swing.JFrame;
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import javax.swing.JOptionPane;
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import javax.swing.JPanel;
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import javax.swing.JTextField;
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public class Interact extends JFrame{
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final JTextField numberField;
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final JButton incButton, randButton;
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public Interact(){
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//stop the GUI threads when the user hits the X button
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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numberField = new JTextField();
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incButton = new JButton("Increment");
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randButton = new JButton("Random");
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numberField.setText("0");//start at 0
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//listen for button presses in the text field
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numberField.addKeyListener(new KeyListener(){
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@Override
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public void keyTyped(KeyEvent e) {
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//if the entered character is not a digit
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if(!Character.isDigit(e.getKeyChar())){
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//eat the event (i.e. stop it from being processed)
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e.consume();
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}
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}
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@Override
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public void keyReleased(KeyEvent e){}
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@Override
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public void keyPressed(KeyEvent e){}
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});
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//listen for button clicks on the increment button
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incButton.addActionListener(new ActionListener(){
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@Override
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public void actionPerformed(ActionEvent e) {
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String text = numberField.getText();
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if(text.isEmpty()){
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numberField.setText("1");
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}else{
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numberField.setText((Long.valueOf(text) + 1) + "");
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}
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}
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});
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//listen for button clicks on the random button
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randButton.addActionListener(new ActionListener(){
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@Override
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public void actionPerformed(ActionEvent e) {
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//show a dialog and if they answer "Yes"
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if(JOptionPane.showConfirmDialog(null, "Are you sure?") ==
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JOptionPane.YES_OPTION){
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//set the text field text to a random positive long
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numberField.setText(Long.toString((long)(Math.random()
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* Long.MAX_VALUE)));
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}
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}
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});
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//arrange the components in a grid with 2 rows and 1 column
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setLayout(new GridLayout(2, 1));
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//a secondary panel for arranging both buttons in one grid space in the window
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JPanel buttonPanel = new JPanel();
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//the buttons are in a grid with 1 row and 2 columns
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buttonPanel.setLayout(new GridLayout(1, 2));
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//add the buttons
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buttonPanel.add(incButton);
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buttonPanel.add(randButton);
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//put the number field on top of the buttons
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add(numberField);
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add(buttonPanel);
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//size the window appropriately
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pack();
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}
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public static void main(String[] args){
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new Interact().setVisible(true);
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}
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}
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