import javax.swing.*;
import java.awt.Color;
import java.awt.BorderLayout;
import javax.swing.event.*;
import java.awt.event.*;

public class JColorChooserTest2 extends JFrame implements ChangeListener, ActionListener{

  JColorChooser colorchooser;
  JLabel colorLabel;
  JTextField redText = new JTextField("", 2);
  JTextField greenText = new JTextField("", 2);
  JTextField blueText = new JTextField("", 2);

  public static void main(String[] args){
    JColorChooserTest2 frame = new JColorChooserTest2();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 450, 400);
    frame.setTitle("タイトル");
    frame.setVisible(true);
  }

  JColorChooserTest2(){
    colorLabel = new JLabel("選択した色が背景色として表示されます");
    colorLabel.setOpaque(true);

    colorchooser = new JColorChooser(Color.GREEN);
    colorchooser.getSelectionModel().addChangeListener(this);

    JPanel selectPanel = new JPanel();

    redText = new JTextField("", 2);
    greenText = new JTextField("", 2);
    blueText = new JTextField("", 2);

    JButton button = new JButton("change");
    button.addActionListener(this);

    selectPanel.add(new JLabel("RED"));
    selectPanel.add(redText);
    selectPanel.add(new JLabel("GREEN"));
    selectPanel.add(greenText);
    selectPanel.add(new JLabel("BLUE"));
    selectPanel.add(blueText);
    selectPanel.add(button);

    getContentPane().add(colorchooser, BorderLayout.CENTER);
    getContentPane().add(colorLabel, BorderLayout.PAGE_START);
    getContentPane().add(selectPanel, BorderLayout.PAGE_END);
  }

  public void stateChanged(ChangeEvent e) {
    Color color = colorchooser.getColor();
    colorLabel.setBackground(color);
  }

  public void actionPerformed(ActionEvent e){
    int red = Integer.parseInt(redText.getText());
    int green = Integer.parseInt(greenText.getText());
    int blue = Integer.parseInt(blueText.getText());

    colorchooser.setColor(red, green, blue);
  }
}