button background

hi experts

I have a bunch of buttons. I need code to set the latest (clicked button)'s background color to yellow. when another is clicked .it is turned yellow and the rest go back to white

thanks
SamooramadAsked:
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KaiNikulainenCommented:
Hi Samooramad,

    You can keep a reference to the last pressed button in a variable. When any button is pressed, change the color of the button in the variable to white and after that set the clicked button's color to yellow and save a reference to that button into the variable.

Kaitsu
0
sudhakar_koundinyaCommented:
are u expecting like this??

package org.prithvi.test;

import javax.swing.*;
import java.awt.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
import java.awt.event.*;

public class ButtonTest
    extends JFrame
    implements ActionListener {
  BorderLayout borderLayout1 = new BorderLayout();
  JButton button1 = new JButton("Hello");
  JButton button2 = new JButton("Hello1");
  JButton button3 = new JButton("Hello2");

  public ButtonTest() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout1);
    JPanel panel1 = new JPanel();
    panel1.add(button1);
    JPanel panel2 = new JPanel();
    panel2.add(button2);
    JPanel panel3 = new JPanel();
    panel3.add(button3);
    this.getContentPane().add(panel1,borderLayout1.EAST);
    this.getContentPane().add(panel2,borderLayout1.CENTER);
    this.getContentPane().add(panel3,borderLayout1.WEST);
    button1.addActionListener(this);
    button2.addActionListener(this);
    button3.addActionListener(this);
  }

  public static void main(String[] args) {
    ButtonTest buttonTest = new ButtonTest();
    buttonTest.setSize(500,500);
    buttonTest.show();
  }

  /**
   * actionPerformed
   *
   * @param e ActionEvent
   */
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == button1) {
      button1.setBackground(Color.YELLOW);
      button2.setBackground(Color.BLACK);
      button3.setBackground(Color.BLACK);
    }
    else if (e.getSource() == button2) {
      button2.setBackground(Color.YELLOW);
      button1.setBackground(Color.BLACK);
      button3.setBackground(Color.BLACK);

    }
    else if (e.getSource() == button3) {
      button3.setBackground(Color.YELLOW);
      button2.setBackground(Color.BLACK);
      button1.setBackground(Color.BLACK);

    }

  }

}
0

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sudhakar_koundinyaCommented:
this is with array of buttons

package org.prithvi.test;

import javax.swing.*;
import java.awt.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
import java.awt.event.*;

public class ButtonTest
    extends JFrame
    implements ActionListener {
  FlowLayout borderLayout1 = new FlowLayout();
  JButton buttons[] = new JButton[10];

  public ButtonTest() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout1);
    JPanel panel1 = new JPanel();
    panel1.setLayout(borderLayout1);

    for (int i = 0; i < 10; i++) {
      buttons[i] = new JButton("Hello" + i);
      buttons[i].addActionListener(this);
      panel1.add(buttons[i]);
    }

    this.getContentPane().add(panel1);

  }

  public static void main(String[] args) {
    ButtonTest buttonTest = new ButtonTest();
    buttonTest.setSize(500, 500);
    buttonTest.show();
  }

  /**
   * actionPerformed
   *
   * @param e ActionEvent
   */
  public void actionPerformed(ActionEvent e) {
    for (int i = 0; i < 10; i++) {
      if (e.getSource() == buttons[i]) {
        buttons[i].setBackground(Color.YELLOW);
      }
      else {
        buttons[i].setBackground(Color.WHITE);
      }
    }

  }

}
0
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sudhakar_koundinyaCommented:
This must be a bit efficient, maintains the last clicked in memory

package org.prithvi.test;

import javax.swing.*;
import java.awt.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
import java.awt.event.*;

public class ButtonTest
    extends JFrame
    implements ActionListener {
  FlowLayout borderLayout1 = new FlowLayout();
  JButton buttons[] = new JButton[10];
  JButton oldbutton;

  public ButtonTest() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout1);
    JPanel panel1 = new JPanel();
    panel1.setLayout(borderLayout1);

    for (int i = 0; i < 10; i++) {
      buttons[i] = new JButton("Hello" + i);
      buttons[i].addActionListener(this);
       buttons[i].setBackground(Color.WHITE);
      panel1.add(buttons[i]);
    }

    this.getContentPane().add(panel1);

  }

  public static void main(String[] args) {
    ButtonTest buttonTest = new ButtonTest();
    buttonTest.setSize(500, 500);
    buttonTest.show();
  }

  /**
   * actionPerformed
   *
   * @param e ActionEvent
   */
  public void actionPerformed(ActionEvent e) {
    for (int i = 0; i < 10; i++) {
      if (e.getSource() == buttons[i]) {
        if (oldbutton != null) {
          oldbutton.setBackground(Color.WHITE);
        }
        buttons[i].setBackground(Color.YELLOW);
        oldbutton = buttons[i];
        break;
      }

    }

  }

}
0
SamooramadAuthor Commented:
thanks
0
sudhakar_koundinyaCommented:
thanks for accepting
0
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