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Scrolll bar in awt in java


                        Scrolll bar in awt

       Scrollbar class: The Srcollbar class is used for creating the Scrollbar control. It is used for sliding in the range of values.
Constructors:
ü           Scrollbar()
ü            Scrollbar(int orientation)
ü           Scrollbar(int orientation , int value ,int width,int min,int max)
    (i) Scrollbar()
            It is the default constructor of the Scrollbar class.it will create a horizontal scrollbar,And the         position of the Thumb or elevator will be at zero.
(ii) Scrollbar(int orientation)
            It is also used to create the Scrollbar. It take one argument to specify the    orientation for the scrollbar. The orientation of the scrollbar can either be HORIZONTAL or VERTICAL, it is specified using the static constants defined in the class Scrollbar.
(iii) Scrollbar(int orientation , int value ,int width,int min,int max)
            where
            orientation specify whether the scrollbar will appear Horizontal or vertical
            value will specify the position of the thumb or elevator in the scrollbar.
            width is used to control the thickness of the scrollbar thumb or elevator
            min it is used to specify the minimum range or limit of scrollbar
            max it is used to specify the maximum range or limit of scrollbar

Method:
1. getValue()                                       This method is used to return the value according to the positioning of the thumb in the scrollbar. The general form is ,
                                                                                    int getValue()
2. setValue()                                        This method is used to position the thumb in the scrollbar.
                                                            The general form
                                                                                    void setValue(int value)
                                                                                    where,
                                                                                    value is used to specify the position.

Event Handling with the Scrollbar:
                        The Scrollbar will generate the AdjustmentEvent, which will be handled by the method adjustmentValueChanged() of the AdjustmentListener interface in the package java.awt.event.

            The AdjustmentEvent class provides the method getAdjustable() which     returns the reference of the item on which we have clicked
                        Scrollbar referencename=(Scrollbar) ae.getAdjustable()
                        where
                                    ae is the reference of the AdjustmentEvent.
The general form of the method
                        public void adjustmentValueChanged(AdjustmentEvent ae)
                        {
                                    Scrollbar sb=(Scrollbar)ae.getAdjustable();
                                    /*body of the method*/
                        }

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