CCITcoder
Contents
Introduction to Java
DataType and Operation
Conditional statements
Iterative statements
Functions
OOPs
- OOPs
- Object
- Access Specifiers
- Methods Returning Value
- Nesting of methods
- method Overloading
- Constructor
- Constructor Overloading
- Immutablemmutable Objects
String
Static Data members
Inherintance
- Inherintance
- Method Overriding
- calling base method
- Constructors and Inheritance
- Types of Inheritance
- Single Inhertance
- Multi-level Inheritance
- Hierarchical Inheritance
Polymorphisam
Applets
AWT
- AWT
- Class Frame
- Class Button
- Event Delegation Modal
- Class TextField
- Class TextArea
- Class Label
- Class Component
- Class Container
- Class Checkbox
- Class List
- Class Choice
- Class FlowLayout
- Class BorderLayout
- Class GridLayout
- Class CardLayout
- Class Panel
- Class Font
- Menus
- Mouse Events
- Window Events
MultiThreading
I/o
Exception Handling
Collection FrameWork
Contents
Introduction to Java
DataType and Operation
Conditional statements
Iterative statements
Functions
OOPs
- OOPs
- Object
- Access Specifiers
- Methods Returning Value
- Nesting of methods
- method Overloading
- Constructor
- Constructor Overloading
- Immutablemmutable Objects
String
Static Data members
Inherintance
- Inherintance
- Method Overriding
- calling base method
- Constructors and Inheritance
- Types of Inheritance
- Single Inhertance
- Multi-level Inheritance
- Hierarchical Inheritance
Polymorphisam
Applets
AWT
- AWT
- Class Frame
- Class Button
- Event Delegation Modal
- Class TextField
- Class TextArea
- Class Label
- Class Component
- Class Container
- Class Checkbox
- Class List
- Class Choice
- Class FlowLayout
- Class BorderLayout
- Class GridLayout
- Class CardLayout
- Class Panel
- Class Font
- Menus
- Mouse Events
- Window Events
MultiThreading
I/o
Exception Handling
Collection FrameWork
AWT-Abstract Window Toolkit
Class TextArea
- It is used to create a multiline TextBox.
- It is derived from class TextComponent.
Constructors
- TextArea()
- Constructs a new text area with the empty string. For ex: txt=new TextArea();
- TextArea(int rows, int columns)
- Constructs a new text area with empty.
- Rows indicates number of visible lines.
- Cols indicates width in chars. For ex: txt=new TextArea(5,20);
- TextArea(String text)
- Constructs a new text area with the specified text. For ex: txt=new TextArea("CCIT\nRajapeth\nAmravati");
- TextArea(String text, int rows, int columns)
- Constructs a new text area with the specified text and size. For ex: txt=new TextArea("CCIT\nRajapeth\nAmravati",5,20);
- void append(String str)
- Appends the given text . For ex:txt.append("Amravati");
- void insert(String str, int pos)
- Inserts the specified text at the specified position. For ex: txt.insert("Rajapeth",5);
- void replaceRange(String str, int start, int end)
- Replaces text between the indicated start and end positions with the specified replacement text. For ex:txt.replaceRange("",5,13);
#Design a simple Calculator Frame.
import java.awt.*;
import java.awt.event.*;
class MyFrame extends Frame implements ActionListener
{
TextField t1,t2;
Button b1,b2,b3,b4;
TextArea txt;
public MyFrame()
{
setLayout(new FlowLayout());
t1=new TextField(10);
t2=new TextField(10);
b1=new Button("+");
b2=new Button("-");
b3=new Button("x");
b4=new Button("/");
txt=new TextArea(5,20);
add(t1);
add(t2);
add(b1);
b1.addActionListener(this);
add(b2);
b2.addActionListener(this);
add(b3);
b3.addActionListener(this);
add(b4);
b4.addActionListener(this);
add(txt);
}
public void actionPerformed(ActionEvent e)
{
String n1=t1.getText();
String n2=t2.getText();
Double d1=Double.parseDouble(n1);
Double d2=Double.parseDouble(n2);
double n=0;
String op=e.getActionCommand();
if(op.equals("+"))
n=d1+d2;
if(op.equals("-"))
n=d1-d2;
if(op.equals("x"))
n=d1*d2;
if(op.equals("/"))
n=d1/d2;
String rs=String.valueOf(n);
String exp=n1+" "+op+" "+n2+"="+rs;
txt.insert(exp+"\n",0);
}
}
class demo
{
public static void main(String args[])
{
MyFrame frm=new MyFrame();
frm.setVisible(true);
frm.setSize(400,400);
}
}
