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Panel

Package : Java.awt

Class: java.awt.Panel

Note :Panel is the simplest container class. A panel provides space in which an application can attach any other component, including other panels.

Constructors of Panel Class

Name	Description
`Panel()`	This constructor creates panel .
`Panel(LayoutManager layout)`	This constructor creates panel with specified Layout.

Methods of Panel Class

Method	Description
`getAccessibleContext()`	This method Gets the AccessibleContext associated with this Panel.

Example :

package com.techknow.panel;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class PanelDemo extends Frame
	implements ActionListener 
{
	private Panel panel1 = new Panel();
	private Panel panel2 = new Panel();
	Button ok = new Button("Show");
	Button cancel = new Button("Hide");
	Button save = new Button("Save");
	Button open = new Button("Open");
	Button exit = new Button("Exit");
	private Label label1 = new Label();
	public PanelDemo() 
	{
		try 
		{
			jbInit();
		}
		catch (Exception e) 
		{
        	e.printStackTrace();
		}
	}
	public static void main(String[] args) 
	{
	    PanelDemo panelDemo = new PanelDemo();
	    panelDemo.setSize(300,300);
	    panelDemo.setVisible(true);
	}
	private void jbInit() throws Exception 
	{
		this.setLayout(null);
		this.setTitle("Panel Demo");
		panel1.setBounds(new Rectangle
			(0, 0, 395, 120));
		panel1.setLayout(null);
		panel1.add(label1, null);
		panel1.add(ok);
		panel1.add(cancel, null);
		this.add(panel1);
		panel1.setSize(200, 200);
		ok.setBounds(10, 20, 50, 50);
		cancel.setBounds(90, 20, 50, 50);
		ok.setBounds(new Rectangle
			(10, 70, 70, 35));
		ok.setFont(new Font("Tahoma", 1, 12));
		ok.setForeground(Color.blue);
		ok.addActionListener(this);
		cancel.setBounds(new Rectangle
			(100, 70, 75, 35));
		cancel.setFont(new Font("Tahoma", 1, 12));
		cancel.setForeground(Color.red);
		cancel.addActionListener
		(new PanelDemo_cancel_actionAdapter(this));
		exit.addActionListener(this);
		label1.setText("Show And Hide Panel");
		label1.setBounds(new Rectangle
			(5, 35, 240, 30));
		label1.setFont(new Font("Tahoma", 1, 12));
		panel1.setLayout(null);
		panel2.setBounds(new Rectangle
			(10, 200, 395, 265));
		panel2.setSize(200, 200);
		panel2.setBackground(new Color
			(232, 226, 237));
		save.setBounds(10, 220, 50, 50);
		open.setBounds(90, 220, 50, 50);
		exit.setBounds(140, 220, 50, 50);
		panel2.add(save);
		panel2.add(open);
		panel2.add(exit);
		this.add(panel2);
		panel2.setVisible(false);
	}
	public void actionPerformed(ActionEvent e)
	{
		panel2.setVisible(true);
	}
	void cancel_actionPerformed(ActionEvent e)
	{
		panel2.setVisible(false);
	}
	void exit_actionPerformed(ActionEvent e)
	{
		System.exit(0);
	}
}
final class PanelDemo_cancel_actionAdapter
	implements ActionListener
{
	private PanelDemo adaptee;
	PanelDemo_cancel_actionAdapter
		(PanelDemo adaptee)
	{
		this.adaptee = adaptee;
	}
	public void actionPerformed(ActionEvent e)
	{
		adaptee.cancel_actionPerformed(e);
	}
}

Output :

AWT Panel

Checkbox

Package : Java.awt

Class: java.awt.Checkbox

Note : A check box is a graphical component that can be in either an "on" (true) or "off" (false) state.

Constructors of CheckBox Class

Name	Description
`Checkbox()`	This constructor creates instance of a CheckBox.
`Checkbox(String label)`	This constructor creates instance of a CheckBox with the particular Label.
`Checkbox(String label, boolean state)`	This constructor creates instance of a CheckBox with particular label of srting and sets the particular state.
`Checkbox(String label, boolean state,` `CheckboxGroup group)`	This constructor creates instance of a CheckBox with particular label of srting,sets the particular state and add it in a checkboxGroup.

Methods of CheckBox Class

Method	Description
`addItemListener(ItemListener l)`	This method sets the actionListener on the Checkbox.
`getCheckboxGroup()`	This method gets the CheckboxGroup of Checkbox.
`getItemListeners()`	This method gets the actionListener.
`getLabel()`	This method gets the Label of Checkbox.
`getState()`	This method gets the state of the Checkbox.
`paramString()`	Returns a string representing the state of this Checkbox.
`removeItemListener(ItemListener l)`	This method removes the specific itemListener.
`setLabel(String label)`	This method sets the label of Checkbox.
`setState(boolean state)`	This method sets the state of Checkbox.

Example :

package com.techknow.checkbox;

import java.awt.Button;
import java.awt.Checkbox;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Rectangle;
import java.awt.SystemColor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

public class CheckBox extends Frame
{
	private Checkbox checkbox1 = new Checkbox();
	private Label label1 = new Label();
	private Label label2 = new Label();
	private boolean counter=true;
	public CheckBox()
	{
		try
		{
	    	jbInit();
		}
		catch (Exception e)
		{
	    	e.printStackTrace();
		}
	}
	private void jbInit() throws Exception
	{
		this.setLayout( null );
		this.setSize(new Dimension(270, 202));
		this.setBackground( SystemColor.control );
		checkbox1.setLabel("Hello");
		checkbox1.setBounds(new Rectangle
			(85, 40, 105, 40));
		checkbox1.setFont(new Font("Tahoma", 1, 14));
		checkbox1.addMouseListener(new MouseAdapter()
		{
			public void mouseClicked(MouseEvent e)
			{
				checkbox1_mouseClicked(e);
			}
		});
		label1.setBounds(new Rectangle
			(0, 100, 230, 70));
		label1.setAlignment(1);
		label1.setFont(new Font("Tahoma", 1, 14));
		label2.setText("Check any Checkbox");
		label2.setBounds(new Rectangle(35, 5, 170, 25));
		label2.setFont(new Font("Tahoma", 1, 14));
		label2.setAlignment(1);
		this.add(label2, null);
		this.add(label1, null);
		this.add(checkbox1, null);
	}
	public static void main(String args[])
	{
		CheckBox obj=new CheckBox();
		obj.setSize(200,200);
		obj.setVisible(true);
		obj.setLocation(150,150);
	}
	private void checkbox1_mouseClicked(MouseEvent e)
	{
		if(counter)
		{
			String str=checkbox1.getLabel();
			label1.setText(" "+str);
			counter=false;
		}
		else
		{
			String str=checkbox1.getLabel();
			label1.setText(" ");
			counter=true;
		}
	}
}

Output :

AWT Checkbox

FileDialog

Package : Java.awt

Class: java.awt.FileDialog

Note :The FileDialog class displays a dialog window from which the user can select a file.

Constructors of FileDialog Class

Name	Description
`FileDialog(Dialog parent)`	This constructor creates instance of a FileDialog to load File.
`FileDialog(Dialog parent, String title)`	This constructor creates instance of a FileDialog to load file with a appropriate Label.
`FileDialog(Dialog parent,` `String title, int mode)`	This constructor creates instance of a FileDialog in a specific Parent Container with a appropriate Label and the specific mode to load or save file.
`FileDialog(Frame parent)`	This constructor creates instance of a FileDialog in a specific Parent Container.
`FileDialog(Frame parent,String title)`	This constructor creates instance of a FileDialog in a specific Parent Container with the particular label.
`FileDialog(Frame parent,` `String title, int mode )`	This constructor creates instance of a FileDialog in a specific Parent Container, with label and mode to load or save file.

Methods of FileDialog Class

Method	Description
`getDirectory()`	This method gets the Directory of File Dialog.
`getFile()`	This method gets the File.
`getFilenameFilter()`	This method shows the file dialog filename is filter.
`getFiles()`	This method returns the files which selected by user.
`getMode()`	This method returns the mode of File Dialog load or save.
`isMultipleMode()`	This method allow to select multiple files at a time.
`setDirectory(String dir)`	This method sets the directory of File Dialog.
`setFile(String file)`	This method sets the file.
`setFilenameFilter(FilenameFilter filter)`	This method sets the filter.
`setMode(int mode)`	This method sets the mode File Dialog.

Example :

import java.io.*;
import java.awt.*;
import java.awt.event.*;

public class FileDialogDemo extends Frame
	implements ActionListener
{
	FileDialog fd1;
	Button openPlease;
	Label lab1;
	TextArea ta1;
	public FileDialogDemo()
	{
		fd1 = new FileDialog
			(this, "Select File to Open");
		openPlease = new Button("Open File");
		openPlease.setBackground(Color.green);
		lab1 = new Label
			("Complete path of the selected file");
		ta1 = new TextArea(40, 20); 
		add(openPlease, "South");
		add(ta1, "Center");
		add(lab1, "North");
		openPlease.addActionListener(this); 
		setTitle("FileDialog Practice");  
		setSize(525, 325);  
		setVisible(true);
		// a shortcut to close the frame
		addWindowListener(new WindowAdapter()
		{
			public void windowClosing
				(WindowEvent e)
			{
				System.exit(0);	
			}
		});
	}
	public void actionPerformed(ActionEvent e)
	{
		fd1.setVisible(true);
		lab1.setText("Directory: " + 
			fd1.getDirectory());
		display(fd1.getDirectory() + 
			fd1.getFile());
	} 
	public void display(String fname)
	{
		// this method is for reading a file
		try
		{
			FileInputStream fis1 = new
				FileInputStream(fname);
			int fileSize = fis1.available();
			byte buf1[] = new byte[fileSize];
			fis1.read(buf1);
			String str1 = new String(buf1);
			ta1.setText(str1);
		}
		catch(IOException e)
		{
			System.exit(0); 
		} 
	}
	public static void main(String args[])
	{ 
		new FileDialogDemo();  
	}
}

Output :

AWT File Dialog

Print Dialog

Package : Java.awt

Class: java.awt.PrintDialog

Note :Class used to handle the "Print" command.

The PrintDialog used to get print information rather than soft copy.
Print Dialog is mostly used Dialog box in comparison others .
Most AWT application have Print Dialog to make them Standard.

Constructors of Textfield Class

Name	Description
`PrintDialog(Printable)`	This constructor creates instance of a PrintDialog.

Methods of Print Dialog Class

Method	Description
`doPrint(String text, String printCommand, String printFile)`	This method executes the print command.
`actionPerformed(ActionEvent e)`	This method perform a specific event.

Example :

package com.techknow.printdialog;

import java.awt.Button;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Rectangle;
import java.awt.SystemColor;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.print.PrinterJob;
import javax.print.PrintService;

public class PrintDialogDemo extends Frame
{
	private Button button1 = new Button();
	private TextArea textArea1 = new TextArea();
	public PrintDialogDemo()
	{
		try
		{
			jbInit();
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
	private void jbInit() throws Exception
	{
	    this.setLayout( null );
	    this.setSize(new Dimension(407, 309));
	    this.setBackground( SystemColor.control );
	    this.setTitle("Print Dialog Demo");
	    this.setVisible(true);
	    this.setResizable(false);
	    this.setLocation(250,200);
	    button1.setLabel("Print");
	    button1.setBounds(new Rectangle
	    	(15, 250, 70, 22));
	    button1.setFont(new Font("Tahoma", 1, 12));
	    button1.addActionListener(new ActionListener()
	    {
			public void actionPerformed(ActionEvent e)
			{
				button1_actionPerformed(e);
			}
		});
		textArea1.setBounds(new Rectangle
			(5, 25, 395, 210));
		this.add(textArea1, null);
		this.add(button1, null);
	}
	public static void main(String args[])
	{
		new PrintDialogDemo();
	}
	private void button1_actionPerformed
		(ActionEvent e)
	{
		// PrinterJob Class controls 
		// printing to a particular print 
		service (such as a printer or fax capability).
    	PrinterJob printJob = PrinterJob.getPrinterJob();
		PrintService printer = printJob.getPrintService();
		printJob.printDialog();   
	}
}

Output :

Print Dialog

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