AWT Introduction

AWT means abstract window toolkit .it Provide Graphical User Interface to JAVA application.

It is the technology to create graphics-based desktop application now AWT is outdated.AWT was enchanted by Swing component.

Java provides awt package and multiple AWT Classes to design frame, panel, and applet.


AWT provides TextFiled, Button, List, Choice, CheckBox, CheckBoxGroup, Menu, Label, and multiple classes to create the user interface.



Create a Simple Hello World Program in AWT?

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

public class AWTExample1 extends Frame {

    Label lbl;
 
    public AWTExample1()  {
        setVisible(true);
        setSize(500,500);
        setLayout(null);
        setBackground(Color.yellow);
        lbl= new Label("Hello World");
        lbl.setBounds(100,30,150, 30);
        add(lbl);
        addWindowListener(new WindowAdapter() {
         
            public void windowClosing(WindowEvent ex)
            {
                System.exit(0);
            }
           });
     
     
     
    }
    public static void main(String[] args) {
        AWTExample1 obj = new AWTExample1();
    }
 
 
 
}

AWT Program 2:-


package advanceconceptofjava;
import java.awt.*;
import java.awt.event.*;

public class AWTExample1 extends Frame {

    Label lbl;
    Button btn;
 
    public AWTExample1()  {
        setVisible(true);
        setSize(500,500);
        setLayout(null);
        setBackground(Color.yellow);
        lbl= new Label("Hello World");
        lbl.setBounds(100,30,150, 30);  //x,y,width,height
        add(lbl);
        btn = new Button("click");
        btn.setBounds(100,80,100,30);
        add(btn);
        addWindowListener(new WindowAdapter() {
         
            public void windowClosing(WindowEvent ex)
            {
                System.exit(0);
            }
           });
     
     
     
    }
    public static void main(String[] args) {
        AWTExample1 obj = new AWTExample1();
    }
 
 
 
}

Event Handling in AWT?


If we perform any action in the UI Component of AWT then the event will be raised.

AWT Event will be handled by java.awt.event.*;


Event has three Sub Component:-
1 Listener:-  It is used to get a response of event.

2 Handler: It is used to handle the event activity

3 Performer:-  It is used to perform event operation


addActionListner(new ActionListner(){  

public void actionPerformed(ActionEvent ex)
{

}
}
)


Listner:-  ActionListner is an interface which will be defined by as an anonymous class

Handler :-  ActionEvent is a Handler

Performer:-  actionPerformed() is a performer


package advanceconceptofjava;


import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


/**
 *
 * @author SHIVA
 */
public class AWTExample2 extends Frame {
    Label lbl1,lbl2,lbl3;
    Button btn;
    TextField txt1,txt2;
    public AWTExample2()
    {
        setVisible(true);
        setSize(500,500);
        setLayout(null);
        setBackground(Color.yellow);
        lbl1 = new Label("Enter First Number");
        lbl1.setBounds(100, 30, 100, 30);
        add(lbl1);
        txt1 = new TextField();
        txt1.setBounds(250, 30, 100, 30);
        add(txt1);
         lbl2 = new Label("Enter Second Number");
        lbl2.setBounds(100, 70, 100, 30);
        add(lbl2);
        txt2 = new TextField();
        txt2.setBounds(250, 70, 100, 30);
        add(txt2);
        btn = new Button("CLICK");
        btn.setBounds(250, 120, 100, 30);
        add(btn);
        lbl3 = new Label();
        lbl3.setBounds(100, 200, 100, 30);
        add(lbl3);
        btn.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
               int a = Integer.parseInt(txt1.getText());
               int b = Integer.parseInt(txt2.getText());
               int c=a+b;
               lbl3.setText("result "+c);
            }
        });
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent ex)
            {
                System.exit(0);
            }
         
});
     
     
    }
    public static void main(String[] args) {
        AWTExample2 obj = new AWTExample2();
    }
 
}

AWT Component:-

1 Label:-  IT is used to write content on Frame.

Label lbl = new Label();
lbl.setText("content");

2 Button:-  It is used to perform action means manage event handling process.

Button btn = new Button();

3 TextFiled:-  It is used to take from input from user's using single line text.

TextField txt = new TextField();

String var=txt.getText();

4 Textarea:-  It is used to write multiple line text similar to text field.

TextArea txt11 = new TextArea();

String var = txt11.getText();

5 Choice:-  It is used to Select Single Item in List, It is also called DropDownList.

We will manually add an item under choice.
Choice ch = new Choice();
ch.add("item");

6 LIST:-  it is used to select multiple items in the LIST . It is also called ListBox.

We will manually add an item under list.
List ch = new List();
ch.add("item");

We will set multiple mode property to true for multiple selections.

Event is ItemStateChanged


ASSIGNMENT:-

1) WAP to create Calculator for UserOperation

2) Marksheet Program

3) Salary Calculator Program

4) Prime Number Series?

5) WAP to draw the pattern

row    5

col   5