ComboBoxUI (Java SE 9 & JDK 9 )

java.lang.Object
- javax.swing.plaf.ComponentUI
- - javax.swing.plaf.ComboBoxUI

Direct Known Subclasses:

BasicComboBoxUI, MultiComboBoxUI
```
public abstract class ComboBoxUI
extends ComponentUI
```
Pluggable look and feel interface for JComboBox.

Constructor Summary

Constructors
Constructor Description

ComboBoxUI()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract boolean`	`isFocusTraversable(JComboBox<?> c)`	Determine whether or not the combo box itself is traversable
`abstract boolean`	`isPopupVisible(JComboBox<?> c)`	Determine the visibility of the popup
`abstract void`	`setPopupVisible(JComboBox<?> c, boolean v)`	Set the visibility of the popup

Methods inherited from class javax.swing.plaf.ComponentUI
contains, createUI, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMaximumSize, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ComboBoxUI
```
public ComboBoxUI()
```
- Method Detail
  - setPopupVisible
```
public abstract void setPopupVisible(JComboBox<?> c,
                                     boolean v)
```
    Set the visibility of the popup
    
    Parameters:
    
    c - a JComboBox
    
    v - a boolean determining the visibilty of the popup
  - isPopupVisible
```
public abstract boolean isPopupVisible(JComboBox<?> c)
```
    Determine the visibility of the popup
    
    Parameters:
    
    c - a JComboBox
    
    Returns:
    
    true if popup of the JComboBox is visible
  - isFocusTraversable
```
public abstract boolean isFocusTraversable(JComboBox<?> c)
```
    Determine whether or not the combo box itself is traversable
    
    Parameters:
    
    c - a JComboBox
    
    Returns:
    
    true if the given JComboBox is traversable