Documentum and Java : Get started with AWT

AWT (Abstract Window Toolkit)

Concepts :

CUI vs GUI
Packages
Get Started with Awt or steps
Types of Classes
Event Delegation Model
Example of an GUI

1. CUI vs GUI :

CUI stands for Character User Interface , It is used for developing an Command Applications e.g. M.S.DOS.

GUI stands for Graphical User Interface , It is used for developing WYSIWYG(What you see what you get) or look and feel Applications e.g. M.S.WINDOWS

2.Packages for developing GUI :

Java.applet.*;
Java.awt.*;
Javax.swing.*;

3. Get started with AWT or steps :

Step-1 :

Create an instance of a component class which is required to you.

Eg : Label lb=new Label();

TextField tf=new TextField();

Button b1=new Button(); etc

Step-2:

Add the component class to Frame.

Eg : add(lb);

add(tf);

add(b1);

Step-3:

Add the related Listener to related Component

Eg: b1.addActionListener();

4. Types of Classes :

Component class
Container class
Helper Class

Component Class:

Java.awt.Label // Label

Java.awt.Button // Button

Java.awt.TextField // TextField

Java.awt.TextArea // TextArea

Java.awt.Choice // Choice

Java.awt.List // List

Java.awt.CheckBox // CheckBox

Java.awt.CheckBoxGroup // CheckBoxGroup

Java.awt.ScrollBar // ScrollBar

Container Class
java.awt.Frame
java.awt.Panel

Helper Class
java.awt.Font
java.awt.Color

Component class	Listener / Interface	Listener Method
Label Button CheckBox CheckBoxGroup TextField TextArea Choice List ScrollBar Frame Keyboard Listener	No Listener ActionListener Item Listener Item Listener FocusListener ActionListener FocusListener ActionListener ItemListener ActionListener ItemListener ActionListener Adjustment Listener MouseMotionListener windowListener KeyListener	- Public void actionPerformed(ActionEvent ae) Public void ItemStateChanged(ItemEvent ie) Public void ItemStateChanged(ItemEvent ie) Public void FocusGained(FocusEvent fe) Public void FocusLost(FocusEvent fe) Public void actionPerformed(ActionEvent ae) Public void FocusGained(FocusEvent fe) Public void FocusLost(FocusEvent fe) Public void actionPerformed(ActionEvent ae) Public void ItemStateChanged(ItemEvent ie) Public void actionPerformed(ActionEvent ae) Public void ItemStateChanged(ItemEvent ie) Public void actionPerformed(ActionEvent ae) Public void adjustmentValueChanged(AdjustmentEvent ae) Public void MouseMoved(MouseEvent me) Public void windowActivated(WindowEvent we) Public void windowDeactvivated(WindowEvent we) Public void windowClosing(WindowEvent we) Public void windowClosed(WindowEvent we) Public void windowOpened(WindowEvent we) Public void KeyPressed(KeyEvent ke) Public void KeyReleased(KeyEvent ke) Public void KeyTyped(KeyEvent ke)

Source code for Closing the window:

Import java.awt.*;

Import java.awt.event.*;

Public class FirstFrame extends Frame implements ActionListener

{

FirstFrame()

{

setVisible(true);

setSize(300,100);

setLocation(100,300);

addWindowListener(new windowAdapter()

{

Public void windowClosing(WindowEvent we)

{

System.exit(0);

}

});

}

Public static void main(String args[])

{

FirstFrame f=new FirstFrame();

}

Source Of Each Component :

Label :

Label is a class which is present in java.awt package. It is used to display the text onto the frame.

Syntax :
                   Label obj=new Label("Text");
   Label obj=new Label("Text",Label.CENTER); // for print the text at center of the frame
   Label obj=new Label("Text",Label.LEFT);
                   Label obj=new Label("Text",Label.RIGHT);

Download Source

Example for Source Code:

import java.awt.*;
import java.awt.event.*;
public class LabelDemo extends Frame
{
public static void main(String args[])
{
Label lb1=new Label("Green");
Label lb2=new Label("Blue");
Label lb3=new Label("Red");

Panel p1=new Panel(new FlowLayout());

p1.add(lb1);
p1.add(lb2);
p1.add(lb3);

Frame f=new Frame();

f.add(p1);
f.setVisible(true);
f.setSize(300,300);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
}
}

Compiling and Running the above Program :

File Name : LabelDemo.java
Compiling from command prompt : javac LabelDemo.java
Running from command prompt : java LabelDemo

OUTPUT :

Button :

import java.awt.*;
import java.awt.event.*;
public class ButtonDemo extends Frame
{
public static void main(String args[])
{
Button b1=new Button("Submit");
Panel p1=new Panel(new FlowLayout());

p1.add(b1);

Frame f=new Frame();

f.add(p1);
f.setVisible(true);
f.setSize(300,300);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
}
}

Compiling and Running the above Program :

File Name : ButtonDemo.java
Compiling from command prompt : javac ButtonDemo.java
Running from command prompt : java ButtonDemo

Output :

TextField Examples with Labels and Button :

import java.awt.*;import java.awt.event.*;
public class Task1 extends Frame
{
Label l1,l2,l3;
Button b1,b2;
TextField tf1,tf2;
Panel p1,p2,p3;
JOptionPane p;
Task1()
{
l1=new Label("Login Page",Label.CENTER);
l2=new Label("UserName :");
l3=new Label("PassWord :");

b1=new Button("Log-in");
b2=new Button("Cancel");

tf1=new TextField(40);
tf2=new TextField(40);
tf2.setEchoChar('*');

p1=new Panel();
p1.setLayout(new FlowLayout());
p2=new Panel();
p2.setLayout(new GridLayout(3,2));
p3=new Panel();
p3.setLayout(new FlowLayout());
p1.add(l1);
p2.add(l2);
p2.add(tf1);
p2.add(l3);
p2.add(tf2);
p3.add(b1);
p3.add(b2);

add(p1);
add(p2);
add(p3);

setLayout(new GridLayout(3,1));
setVisible(true);
setSize(300,190);
setTitle("Login");
setLocation(300,150);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
}
public static void main(String args[])
{
Task1 t=new Task1();
}
}

Compiling and Running the above Program :

File Name : Task1.java
Compiling from command prompt : javac Task1.java
Running from command prompt : javaTask1

Output :