AWT CONTROLS:ScrollBars

A scrollbar is represented by a "slider" widget.......

using Scroll bars

          Scrollbar control represents a scroll bar component in order to enable user to select from range of values.The Scrollbar class embodies a scroll bar, a familiar user-interface object. A scroll bar provides a convenient means for allowing a user to select from a range of values.

Common Constructors:

• Scrollbar ():

                Creates a Scrollbar instance with a range of 0-100, an initial value of 0, and vertical orientation.

• Scrollbar(int style):

                     Constructs a new scroll bar with the specified orientation.

• Scrollbar(int style, int initialValue, int thumbSize, int min, int max)

                   Constructs a new scroll bar with the specified orientation, initial value, page size, and minimum and maximum values.

common methods

•  getUnitIncrement():  Gets the unit increment for this scrollbar.

                 syntax
                     int getUnitIncrement()

•  getValue() : Gets the current value of this scroll bar

                syntax:
                      int getValue()

• setBlockIncrement(int v) :Sets the block increment for this scroll bar

                  syntax:
                       void setBlockIncrement(int v)

•  setMaximum(int newMaximum) :Sets the maximum value of this scroll bar.

                   syntax
                          void setMaximum(int newMaximum)

• setMinimum(int newMinimum) :Sets the minimum value of this scroll bar.

                   syntax
                         void setMinimum(int newMinimum)

•  setOrientation(int orientation) :Sets the orientation for this scroll bar.

                   syntax:
                          void setOrientation(int orientation)

simple program for handling scroll bars

import java.awt.*; 
import java.applet.Applet;  
public class ScrollbarDemo extends Applet
{ 
public void init()
{ 
Scrollbar sb =  new Scrollbar
(Scrollbar.VERTICAL, 0, 8, -100, 100); 
add(sb); 
} 
} 


output: