[Chapter 20] 20.12 java.awt.event.FocusEvent (JDK 1.1)

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| Chapter 20 The java.awt.event Package |

## 20.12 java.awt.event.FocusEvent (JDK 1.1)

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An event of this type indicates that a `Component` has gained or lost focus on a temporary or permanent basis.

Use the inherited `getComponent()` method to determine which component has gained or lost focus. Use `getID()` to determine the type of focus event; it returns `FOCUS_GAINED` or `FOCUS_LOST`.

When focus is lost, you can call `isTemporary()` to determine whether it is a temporary loss of focus. Temporary focus loss occurs when the window that contains the component loses focus, for example, or when focus is temporarily diverted to a popup menu or a scrollbar. Similarly, you can also use `isTemporary()` to determine whether focus is being granted to a component on a temporary basis.

    public class FocusEvent extends ComponentEvent {
        // Public Constructors
                public FocusEvent(Component source, int id, boolean temporary);
                public FocusEvent(Component source, int id);
        // Constants
                public static final int FOCUS_FIRST;
                public static final int FOCUS_GAINED;
                public static final int FOCUS_LAST;
                public static final int FOCUS_LOST;
        // Public Instance Methods
                public boolean isTemporary();
                public String paramString();  // Overrides ComponentEvent
    }

### Hierarchy:

`Object->EventObject(Serializable)->AWTEvent->ComponentEvent->FocusEvent`

### Passed To:

`AWTEventMulticaster.focusGained(), AWTEventMulticaster.focusLost(), Component.processFocusEvent(), FocusAdapter.focusGained(), FocusAdapter.focusLost(), FocusListener.focusGained(), FocusListener.focusLost()`

java.awt.event.FocusAdapter (JDK 1.1) |  | java.awt.event.FocusListener (JDK 1.1)