14. 8. 2. JToggleButton is a button that has two states. Pressed and not pressed.

 

 

import java.awt.Color;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JDialog;import javax.swing.JPanel;import javax.swing.JToggleButton;public class ToggleButton extends JDialog implements ActionListener {  private JToggleButton red = new JToggleButton("red");  private JToggleButton green = new JToggleButton("green");  private JToggleButton blue = new JToggleButton("blue");  private JPanel display = new JPanel();  public ToggleButton() {    JPanel bottom = new JPanel();    JPanel leftPanel = new JPanel();    red.addActionListener(this);    green.addActionListener(this);    blue.addActionListener(this);    leftPanel.add(red);    leftPanel.add(green);    leftPanel.add(blue);    bottom.add(leftPanel);    display.setBackground(Color.black);    bottom.add(display);    add(bottom);    pack();    setResizable(false);    setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);    setVisible(true);  }  public static void main(String[] args) {    new ToggleButton();  }  public void actionPerformed(ActionEvent e) {    Color color = display.getBackground();    int red = color.getRed();    int green = color.getGreen();    int blue = color.getBlue();    if (e.getActionCommand() == "red") {      if (red == 0) {        red = 255;      } else {        red = 0;      }    }    if (e.getActionCommand() == "green") {      if (green == 0) {        green = 255;      } else {        green = 0;      }    }    if (e.getActionCommand() == "blue") {      if (blue == 0) {        blue = 255;      } else {        blue = 0;      }    }    Color setCol = new Color(red, green, blue);    display.setBackground(setCol);  }}