User Interface for Applets in java смотреть онлайн

What are the interfaces in Java applet?
Is applet a GUI?
What is used to run an applet?
What is the use of applet in Java?
Are applets still used?
How do applets differ from application in Java?

User Interface for Applets in java:
The abstract windowing toolkit, also called as AWT is a set of classes, enabling the user to create a user friendly, graphical user interface (GUI) . it will also facilitate receiving user input from the mouse and keyboard.
The AWT classes are part of the java.awt packages.
3 components:
Components: anything that can be put on the user interface. Buttons , check boxes , pop-up menus , text fields.
Containers : Applet window , panels, dialog boxes.
Layout Managers : these define how the components will be arranged in a container.

AWT supplies components :
Label (java.awt.label)
Button (java.awt.button)
Pop-up (java.awt.choice)
Sliders and scrollbars (java.awt.Scrollbar)
Drawinf areas ( java.awt.Canvas)

Adding components to user interface :
Create the component by creating an object of that class.
Call the container’s add method to add the component.
Label : display non editable text
Label() – create an empty label
Label(String) – create a label with the given string
Label (Sting , int) : create a label with the given string an right , left or center alignment.
TextArea: editable text fileds having more than one line indicating whether the filled should be editable or not depending upon the Boolean value.
TextArea() – empty
TextArea(rows, characters);
TextArea(string);
TextArea(string, rows, charindex)
Insert(string, charindex);
Replace(string, stratpos, endpos);
Choice lists: they are called as pop up lists. They enable a single item to be chosen from a list of items;
Methods()
getItem(index);
getItemCount();- returns the number of items
getSelectedItem();- retrun the text of the currently selected item.
getSelectedIndex();-
select(pos); - item indicating the position
select(text) - select the first item in the list with the given text.