Hi Friends Learning core java is a first step in to java programming we are confused what topics are come under core java section and core java is very essential for building logic's for every high end applications,so i listed all topics in table format.
| Basic Java |
OOPS Concepts |
Advanced Topics of java |
| Learn introduction | Objects and Class | String handling |
| Know features of java | Polymorphism | Exception handling |
| Setting class path | Constructor | Multithreading |
| Know About Data Types | This reference | Synchronization |
| Write basic program | Garbage collection | Enumeration |
| Variable rules | Java modifiers | Auto Boxing and Un Boxing |
| Operators in java | Inheritance | Java I/O stream |
| Aggregation | Serialization | |
| Command line arguments | Generics | |
| Packages | Collection framework | |
| Abstraction | Java Networking | |
| interfaces | Applets | |
| Nested class | AWT and Swings |
Java is freely available on Oracle's Website. Download the latest version of JDK (Java Development Kit) on your operating system. Install JDK on your machine. Once you have installed Java on your machine you would need to set environment variable to point to correct installation directory.
PROCEDURE:
Assuming that you have installed Java in C:\ Program files/ Java / JDK directory
Step 1:Right click on my computer and select properties.
Step 2:Go to the Advance System Settings tab.
Step 3:Click on Environment Variables button.
Step 4: Now alter the path variable so that it also contains the path to JDK installed
directory.
Step 5: Select path and click on edit and past class path.Click on ok button.
Step 6: Now go to command prompt and type java and javac, If you successfully
make it you will see commands acknowledge.
Step 7: That's it your done!
Delegation of Event Modelling
- Hi Students I am going to write Article on Delegation of Event Modelling in simplified Manner.
- When an event occurs we programmers has 3 options for handling events
1. Let it happen what ever happen(ignore event).
2. Let any other component manage the event.
*3. Let Delegate its handling to some other object called Listener.
According to delegation of event modeling,For example when a button click or option
Selected by user, Then Listener if we connected listen to the event, and then it invokes
A method called action performed.
Detailed Table for Event Modelling
CONTROL LISTENER METHODS AND EVENTS
Button Action Listener actionPerformed(ActionEvent e)
List Action Listener actionPerformed(ActionEvent e)
MenuItem Action Listener actionPerformed(ActionEvent e)
TextField Action Listener actionPerformed(ActionEvent e)
Checkbox ItemListener itemStateChanged(ItemEvent e)
Choice ItemListener itemStateChanged(ItemEvent e)
List ItemListener itemStateChanged(ItemEvent e)
Checkbox MenuItem ItemListener itemStateChanged(ItemEvent e)
DialogFrame WindowListener windowOpened(WindowEvent e)
DialogFrame WindowListener windowClosing(WindowEvent e)
DialogFrame WindowListener windowMinimized(WindowEvent e)
Scrollbar AdjustmentListener adjustmentValueChanged
(AdjustmentEvent e)
Canvas MouseListener mousePressed(MouseEvent e)
Dialog MouseListener mouseReleased(MouseEvent e)
frame MouseListener mouseEntered(MouseEvent e)
Panel MouseListener mouseExisted(MouseEvent e)
Window MouseListener mouseClicked(MouseEvent e)
Component KeyListener keyTyped(KeyEvent e)
Component KeyListener keyPressed(KeyEvent e)
Component KeyListener keyReleased(KeyEvent e)
Component FocusListener focusGained(FocusEvent e)
Component FocusListener focusLost(FocusEvent e)t
TextComponent TextListener textValueChanged(TextEvet e)
Events and Methods
ActionEvent:
1.When button is get clicked
2.When menu item is selected
3.When list item is double clicked
4.When enter key pressed in text field
Method:
-------------->getSource() gives the source that made this event
ItemEvent:
1.When a check box is selected/deselected
2.When choice item is selected/deselected
3.When list item is selected/deselected
4.When check box menu item is selected/deselected
Method:
-------------->getItemSelectable() gives reference to the item selected component
getItem() gives reference to the item that caused the event
AdjustmentEvent:
1.When a scroll bar thumb is moved
Method:
-------------->getAdjustable() gives the object that caused the event
getValue() gives the new value
TextEvent:
1.When content of text is changed in TextField,TextArea
MouseEvent:
1.When user clicks or moves the mouse pointer
Method:
------------->getX(),getY() gives x,y screen coordinates of mouse position
getClickCount() gives click count for an event
WindowEvent:
1.When a window minimized ,opened ,activated etc.
FocusEvent:
1.When a component gains or loses focus
KeyEvent:
1.Its is generated by the user during interaction from keyboard
Method:
1.getKeyCode() gives the key code for a given char
2.getkeyChar() gives char defined by a key code.
