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| Chapter 18 The java.awt Package |

## 18.5 java.awt.Adjustable (JDK 1.1)

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This interface defines the methods that should be implemented by an object that maintains a user-adjustable numeric value. This value has a specified minimum and maximum value, and it may be incremented or decremented either a unit at a time or a block at a time. An `Adjustable` object generates an `AdjustmentEvent` when it is adjusted, and it maintains a list of `AdjustmentListener` objects interested in being notified when such an event occurs.

This interface abstracts the essential functionality of the `Scrollbar` component.

    public abstract interface Adjustable {
        // Constants
                public static final int HORIZONTAL;
                public static final int VERTICAL;
        // Public Instance Methods
                public abstract void addAdjustmentListener(AdjustmentListener l);
                public abstract int getBlockIncrement();
                public abstract int getMaximum();
                public abstract int getMinimum();
                public abstract int getOrientation();
                public abstract int getUnitIncrement();
                public abstract int getValue();
                public abstract int getVisibleAmount();
                public abstract void removeAdjustmentListener(AdjustmentListener l);
                public abstract void setBlockIncrement(int b);
                public abstract void setMaximum(int max);
                public abstract void setMinimum(int min);
                public abstract void setUnitIncrement(int u);
                public abstract void setValue(int v);
                public abstract void setVisibleAmount(int v);
    }

### Implemented By:

`Scrollbar`

### Passed To:

`AdjustmentEvent(), ScrollPanePeer.setUnitIncrement(), ScrollPanePeer.setValue()`

### Returned By:

`AdjustmentEvent.getAdjustable(), ScrollPane.getHAdjustable(), ScrollPane.getVAdjustable()`

java.awt.AWTException (JDK 1.0) |  | java.awt.BorderLayout (JDK 1.0)