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

public class JColorChooserTest1 extends JFrame implements ChangeListener{

  JColorChooser colorchooser;
  JLabel colorLabel;

  public static void main(String[] args){
    JColorChooserTest1 frame = new JColorChooserTest1();

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

  JColorChooserTest1(){
    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();
    colorchooser.getSelectionModel().addChangeListener(this);

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

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