Can JRadioButtons be stored in map

Question

I was wondering if you could add JRadioButtons to a HashMap as a key and Color as value such as:

Map <"JRadioButton, Color"> store =  new HashMap <"JRadioButton, Color">    
store.add(new JRadioButton("FF0000"), Color.red);

Then add an action listener to change panel.setBackground(store.get(e));

Or would just using an ArrayList to hold strings and create [] of radio buttons be better? I'm having trouble figuring out how to have the buttons associated with the color value.

This is not Java. Also, to associate the button with the color, use the color in the listener passed to the button. — , May 02 '14 at 20:25

score 0 · Answer 1 · answered May 02 '14 at 20:25

0

Any object can be stored on a Map, either as a key or as value. However, probably Color would make a better key than JRadioButton, but it depends on your problem.

answered May 02 '14 at 20:25

Andres

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score 0 · Answer 2 · answered May 02 '14 at 20:38

An enum could work nicely here, without need to use a Map or ArrayList, if so desired....

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.*;

import javax.swing.*;

public class ColorBtns extends JPanel {
   public ColorBtns() {
      setLayout(new GridLayout(0, 1));
      ButtonGroup btnGroup = new ButtonGroup();
      ActionListener actnListener = new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent evt) {
            String colorStr = evt.getActionCommand().toUpperCase();
            MyColor myColor = MyColor.valueOf(colorStr);
            setBackground(myColor.getColor());
         }
      };
      for (MyColor myColor : MyColor.values()) {
         JRadioButton radioBtn = new JRadioButton(myColor.getText());
         radioBtn.setOpaque(false);
         radioBtn.setActionCommand(myColor.getText());
         radioBtn.addActionListener(actnListener);
         btnGroup.add(radioBtn);
         add(radioBtn);
      }
   }

   private static void createAndShowGui() {
      ColorBtns mainPanel = new ColorBtns();

      JFrame frame = new JFrame("ColorBtns");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

enum MyColor {
   RED(Color.red, "Red"), ORANGE(Color.orange, "Orange"), YELLOW(Color.yellow,
         "Yellow"), GREEN(Color.green, "Green"), BLUE(Color.blue, "Blue");
   private Color color;
   private String text;

   private MyColor(Color color, String text) {
      this.color = color;
      this.text = text;
   }

   public Color getColor() {
      return color;
   }

   public String getText() {
      return text;
   }

}

Can JRadioButtons be stored in map

2 Answers2