selectformat.java

Creating a Speech-Enabled Calendar Application

/*Import required packages*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JOptionPane;
import java.util.*;
import javax.swing.event.*;
import java.awt.GridLayout;
/*
	Class: SelectFormat-Creates a user interface to set the date format.
		Methods:
			actionPerformed(): Defines the operations to be performed, when the user clicks any button.
*/
public class SelectFormat extends JFrame implements ActionListener
{
/* Declare variables*/
Font f,f1;
JPanel pane,buttonPanel;
JRadioButton rb1,rb2,rb3,rb4,rb5,rb6;
ButtonGroup bg;
JLabel title;
JButton ok,cancel;
public static String retvalue="dd/mm/yyyy";
SpeechCalendar calendar = null;
/* 
	SelectFormat():Default constructor of SelectFormat class
	Parameters:
			calendar: An object of SpeechCalendar class
	Return Type: NA
*/
public SelectFormat(SpeechCalendar calendar)
	{
		this.calendar = calendar;
		/* Initialize the object of JPanel class*/
		pane=new JPanel();
		/* Initialize a JPanel to add buttons.*/
		buttonPanel=new JPanel();
		/*
		Set the layout of JPanel, buttonPanel
		*/
		buttonPanel.setLayout(new GridLayout(1,2));
		/*
		Initialize the JRadioButtons
		*/
		rb1=new JRadioButton("dd/mm/yy");
		rb2=new JRadioButton("dd/mm/yyyy");
		rb3=new JRadioButton("mm/dd/yy");
		rb4=new JRadioButton("mm/dd/yyyy");
		rb5=new JRadioButton("yy/mm/dd");
		rb6=new JRadioButton("yyyy/mm/dd");
		/*
		Initialize a ButtonGroup
		*/
		bg=new ButtonGroup();
		/*
		Add JRadioButtons to the ButtonGroup
		*/
		bg.add(rb1);
		bg.add(rb2);
		bg.add(rb3);
		bg.add(rb4);
		bg.add(rb5);
		bg.add(rb6);
		/*
		Set the layout of the JPanel, pane
		*/
		pane.setLayout(new GridLayout(8,1));
		/*
		Create objects of Font class
		*/
		f=new Font("Verdana",Font.BOLD,12);
		f1=new Font("Verdana",Font.BOLD,10);
		/*
		Set the title of the SelectFormat window
		*/
		title=new JLabel("      Select the format of the date    ");
		title.setFont(f);
		/*
		Initialize objects of JButton class
		*/
		ok=new JButton("OK");
		cancel=new JButton("Cancel");
		/*
		Set font of buttons
		*/
		ok.setFont(f1);
		cancel.setFont(f1);
		/*
		Add action listener to the JButtons
		*/
		ok.addActionListener(this);
		cancel.addActionListener(this);
		/*
		Add JButtons to the buttonPanel
		*/
		buttonPanel.add(ok);
		buttonPanel.add(cancel);
		/* 
		Set the contents of the JPanel, pane
		*/
		pane.add(title);
		pane.add(rb1);
		pane.add(rb2);
		pane.add(rb3);
		pane.add(rb4);
		pane.add(rb5);
		pane.add(rb6);
		pane.add(buttonPanel);
		getContentPane().add(pane);
	}
	/*
		actionPerformed(): Defines the actions to be performed, when the user clicks a button.
		Parameters:
				ev: An object of ActionEvent
		Return Type:NA
	*/
	public void actionPerformed(ActionEvent ev)
	{
		/*
		This code executes when the user clicks the OK button
		*/
		if(ev.getSource()==ok)
		{
	        /* 
			Retrieve all elements of the Buttongroup in an enumeration
			*/
			Enumeration enum=bg.getElements();
			/*
			check if there exists any element in the enumeration
			*/
			while(enum.hasMoreElements())
			{
				JRadioButton button=(JRadioButton)enum.nextElement();
				/*
				 Retrieve the label of the selected JRadioButton
				 */
				if (button.isSelected())
				{
					retvalue=button.getText();
					this.setVisible(false);
					calendar.setFormat(retvalue);
				}
			}
		}
		/*
		This code executes when the user clicks the Cancel button
		*/
		else if(ev.getSource()==cancel)
			{
			this.setVisible(false);
			}
	}
}