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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/TextArea.html below:

TextArea (Java SE 19 & JDK 19)

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible

A

object is a multi-line region that displays text. It can be set to allow editing or to be read-only.

The following image shows the appearance of a text area:

This text area could be created by the following line of code:

 new TextArea("Hello", 5, 40);
 

Since:

1.0

See Also:

• Serialized Form

• Nested Class Summary

  Nested Classes

  protected class 

  This class implements accessibility support for the TextArea class.

• Field Summary

  Fields

  static final int

  Create and display both vertical and horizontal scrollbars.

  static final int

  Create and display horizontal scrollbar only.

  static final int

  Do not create or display any scrollbars for the text area.

  static final int

  Create and display vertical scrollbar only.

• Constructor Summary

  Constructors

  Constructs a new text area with the empty string as text.

  Constructs a new text area with the specified number of rows and columns and the empty string as text.

  Constructs a new text area with the specified text.

  Constructs a new text area with the specified text, and with the specified number of rows and columns.

  Constructs a new text area with the specified text, and with the rows, columns, and scroll bar visibility as specified.

• Method Summary

  void

  Creates the TextArea's peer.

  void

  Appends the given text to the text area's current text.

  void

  Returns the AccessibleContext associated with this TextArea.

  int

  Returns the number of columns in this text area.

  Determines the minimum size of this text area.

  Determines the minimum size of a text area with the specified number of rows and columns.

  Determines the preferred size of this text area.

  Determines the preferred size of a text area with the specified number of rows and columns.

  int

  Returns the number of rows in the text area.

  int

  Returns an enumerated value that indicates which scroll bars the text area uses.

  void

  Inserts the specified text at the specified position in this text area.

  void

  Returns a string representing the state of this TextArea.

  void

  Replaces text between the indicated start and end positions with the specified replacement text.

  void

  void

  Sets the number of columns for this text area.

  void

  Sets the number of rows for this text area.

  Methods declared in class java.awt.TextComponentaddTextListener, enableInputMethods, getBackground, getCaretPosition, getListeners, getSelectedText, getSelectionEnd, getSelectionStart, getText, getTextListeners, isEditable, processEvent, processTextEvent, removeNotify, removeTextListener, select, selectAll, setBackground, setCaretPosition, setEditable, setSelectionEnd, setSelectionStart, setText Methods declared in class java.awt.Componentaction, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paint, paintAll, postEvent, prepareImage, prepareImage, print, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, revalidate, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate

• Field Details
  • SCROLLBARS_BOTH

    public static final int SCROLLBARS_BOTH

    Create and display both vertical and horizontal scrollbars.

    Since:

    1.1

    See Also:

    • Constant Field Values

  • SCROLLBARS_VERTICAL_ONLY

    public static final int SCROLLBARS_VERTICAL_ONLY

    Create and display vertical scrollbar only.

    Since:

    1.1

    See Also:

    • Constant Field Values

  • SCROLLBARS_HORIZONTAL_ONLY

    public static final int SCROLLBARS_HORIZONTAL_ONLY

    Create and display horizontal scrollbar only.

    Since:

    1.1

    See Also:

    • Constant Field Values

  • SCROLLBARS_NONE

    public static final int SCROLLBARS_NONE

    Do not create or display any scrollbars for the text area.

    Since:

    1.1

    See Also:

    • Constant Field Values

• Constructor Details
  • TextArea

    Constructs a new text area with the empty string as text. This text area is created with scrollbar visibility equal to

    SCROLLBARS_BOTH

    , so both vertical and horizontal scrollbars will be visible for this text area.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless returns true

    See Also:

    • GraphicsEnvironment.isHeadless()

  • TextArea

    Constructs a new text area with the specified text. This text area is created with scrollbar visibility equal to

    SCROLLBARS_BOTH

    , so both vertical and horizontal scrollbars will be visible for this text area.

    Parameters:

    text - the text to be displayed; if text is null, the empty string "" will be displayed

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless returns true

    See Also:

    • GraphicsEnvironment.isHeadless()

  • TextArea

    Constructs a new text area with the specified number of rows and columns and the empty string as text. A column is an approximate average character width that is platform-dependent. The text area is created with scrollbar visibility equal to

    SCROLLBARS_BOTH

    , so both vertical and horizontal scrollbars will be visible for this text area.

    Parameters:

    rows - the number of rows

    columns - the number of columns

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless returns true

    See Also:

    • GraphicsEnvironment.isHeadless()

  • TextArea

    Constructs a new text area with the specified text, and with the specified number of rows and columns. A column is an approximate average character width that is platform-dependent. The text area is created with scrollbar visibility equal to

    SCROLLBARS_BOTH

    , so both vertical and horizontal scrollbars will be visible for this text area.

    Parameters:

    text - the text to be displayed; if text is null, the empty string "" will be displayed

    rows - the number of rows

    columns - the number of columns

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless returns true

    See Also:

    • GraphicsEnvironment.isHeadless()

  • TextArea

    Constructs a new text area with the specified text, and with the rows, columns, and scroll bar visibility as specified. All

    TextArea

    constructors defer to this one.

    The TextArea class defines several constants that can be supplied as values for the scrollbars argument:

    • SCROLLBARS_BOTH,
    • SCROLLBARS_VERTICAL_ONLY,
    • SCROLLBARS_HORIZONTAL_ONLY,
    • SCROLLBARS_NONE.

    Any other value for the

    scrollbars

    argument is invalid and will result in this text area being created with scrollbar visibility equal to the default value of

    SCROLLBARS_BOTH

    .

    Parameters:

    text - the text to be displayed; if text is null, the empty string "" will be displayed

    rows - the number of rows; if rows is less than 0, rows is set to 0

    columns - the number of columns; if columns is less than 0, columns is set to 0

    scrollbars - a constant that determines what scrollbars are created to view the text area

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless returns true

    Since:

    1.1

    See Also:

    • GraphicsEnvironment.isHeadless()

• Method Details
  • addNotify

    public void addNotify()

    Creates the TextArea's peer. The peer allows us to modify the appearance of the TextArea without changing any of its functionality.

    Overrides:

    addNotify in class TextComponent

    See Also:

    • TextComponent.removeNotify()

  • insert public void insert(String str, int pos)

    Note that passing null or inconsistent parameters is invalid and will result in unspecified behavior.

    Parameters:

    str - the non-null text to insert

    pos - the position at which to insert

    Since:

    1.1

    See Also:

    • TextComponent.setText(java.lang.String)
    • replaceRange(java.lang.String, int, int)
    • append(java.lang.String)

  • insertText

    Inserts the specified text at the specified position in this text area.

    Parameters:

    str - the non-null text to insert

    pos - the position at which to insert

  • append public void append(String str)

    Note that passing null or inconsistent parameters is invalid and will result in unspecified behavior.

    Parameters:

    str - the non-null text to append

    Since:

    1.1

    See Also:

    • insert(java.lang.String, int)

  • appendText

    Appends the given text to the text area's current text.

    Parameters:

    str - the text to append

  • replaceRange public void replaceRange(String str, int start, int end)

    Note that passing null or inconsistent parameters is invalid and will result in unspecified behavior.

    Parameters:

    str - the non-null text to use as the replacement

    start - the start position

    end - the end position

    Since:

    1.1

    See Also:

    • insert(java.lang.String, int)

  • replaceText

    Replaces a range of characters between the indicated start and end positions with the specified replacement text (the text at the end position will not be replaced).

    Parameters:

    str - the non-null text to use as the replacement

    start - the start position

    end - the end position

  • getRows

    public int getRows()

    Returns the number of rows in the text area.

    Returns:

    the number of rows in the text area

    Since:

    1.0

    See Also:

    • setRows(int)
    • getColumns()

  • setRows

    public void setRows(int rows)

    Sets the number of rows for this text area.

    Parameters:

    rows - the number of rows

    Throws:

    IllegalArgumentException - if the value supplied for rows is less than 0

    Since:

    1.1

    See Also:

    • getRows()
    • setColumns(int)

  • getColumns

    public int getColumns()

    Returns the number of columns in this text area.

    Returns:

    the number of columns in the text area

    See Also:

    • setColumns(int)
    • getRows()

  • setColumns

    public void setColumns(int columns)

    Sets the number of columns for this text area.

    Parameters:

    columns - the number of columns

    Throws:

    IllegalArgumentException - if the value supplied for columns is less than 0

    Since:

    1.1

    See Also:

    • getColumns()
    • setRows(int)

  • getScrollbarVisibility

    public int getScrollbarVisibility()

    The TextArea class defines four integer constants that are used to specify which scroll bars are available. TextArea has one constructor that gives the application discretion over scroll bars.

    Returns:

    an integer that indicates which scroll bars are used

    Since:

    1.1

    See Also:

    • SCROLLBARS_BOTH
    • SCROLLBARS_VERTICAL_ONLY
    • SCROLLBARS_HORIZONTAL_ONLY
    • SCROLLBARS_NONE
    • TextArea(java.lang.String, int, int, int)

  • getPreferredSize public Dimension getPreferredSize(int rows, int columns)

    Determines the preferred size of a text area with the specified number of rows and columns.

    Parameters:

    rows - the number of rows

    columns - the number of columns

    Returns:

    the preferred dimensions required to display the text area with the specified number of rows and columns

    Since:

    1.1

    See Also:

    • Component.getPreferredSize()

  • preferredSize

    Determines the preferred size of the text area with the specified number of rows and columns.

    Parameters:

    rows - the number of rows

    columns - the number of columns

    Returns:

    the preferred dimensions needed for the text area

  • getPreferredSize

    Determines the preferred size of this text area.

    Overrides:

    getPreferredSize in class Component

    Returns:

    the preferred dimensions needed for this text area

    Since:

    1.1

    See Also:

    • Component.getPreferredSize()

  • preferredSize

    Returns the component's preferred size.

    Overrides:

    preferredSize in class Component

    Returns:

    the component's preferred size

  • getMinimumSize public Dimension getMinimumSize(int rows, int columns)

    Determines the minimum size of a text area with the specified number of rows and columns.

    Parameters:

    rows - the number of rows

    columns - the number of columns

    Returns:

    the minimum dimensions required to display the text area with the specified number of rows and columns

    Since:

    1.1

    See Also:

    • Component.getMinimumSize()

  • minimumSize

    Determines the minimum size of the text area with the specified number of rows and columns.

    Parameters:

    rows - the number of rows

    columns - the number of columns

    Returns:

    the minimum size for the text area

  • getMinimumSize

    Determines the minimum size of this text area.

    Overrides:

    getMinimumSize in class Component

    Returns:

    the preferred dimensions needed for this text area

    Since:

    1.1

    See Also:

    • Component.getPreferredSize()

  • minimumSize

    Returns the minimum size of this component.

    Overrides:

    minimumSize in class Component

    Returns:

    the minimum size of this component

  • paramString protected String paramString

    ()

    Returns a string representing the state of this TextArea. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

    Overrides:

    paramString in class TextComponent

    Returns:

    the parameter string of this text area

  • getAccessibleContext

    Returns the AccessibleContext associated with this TextArea. For text areas, the AccessibleContext takes the form of an AccessibleAWTTextArea. A new AccessibleAWTTextArea instance is created if necessary.

    Specified by:

    getAccessibleContext in interface Accessible

    Overrides:

    getAccessibleContext in class TextComponent

    Returns:

    an AccessibleAWTTextArea that serves as the AccessibleContext of this TextArea

    Since:

    1.3

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