Java 2 Platform SE v1.3.1: Class JPasswordField

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.text.JTextComponent
                          |
                          +--javax.swing.JTextField
                                |
                                +--javax.swing.JPasswordField

All Implemented Interfaces:: Accessible, ImageObserver, MenuContainer, Scrollable, Serializable, SwingConstants

public class JPasswordField
extends JTextField

JPasswordField is a lightweight component that allows the editing of a single line of text where the view indicates something was typed, but does not show the original characters. You can find further information and examples in How to Use Text Fields, a section in The Java Tutorial.

JPasswordField is intended to be source-compatible with java.awt.TextField used with echoChar set. It is provided seperately to make it easier to safely change the ui for the JTextField without affecting password entries.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JPasswordField key assignments.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.

See Also:: Serialized Form

Constructor Detail

JPasswordField

public JPasswordField()

Constructs a new JPasswordField, with a default document, null starting text string, and 0 column width.

JPasswordField

public JPasswordField(String text)

Constructs a new JPasswordField initialized with the specified text. The document model is set to the default, and the number of columns to 0.

Parameters:: text - the text to be displayed, null if none

JPasswordField

public JPasswordField(int columns)

Constructs a new empty JPasswordField with the specified number of columns. A default model is created, and the initial string is set to null.

Parameters:: columns - the number of columns >= 0

JPasswordField

public JPasswordField(String text,
                      int columns)

Constructs a new JPasswordField initialized with the specified text and columns. The document model is set to the default.

Parameters:: text - the text to be displayed, null if none; columns - the number of columns >= 0

JPasswordField

public JPasswordField(Document doc,
                      String txt,
                      int columns)

Constructs a new JPasswordField that uses the given text storage model and the given number of columns. This is the constructor through which the other constructors feed. The echo character is set to '*'. If the document model is null, a default one will be created.

Parameters:: doc - the text storage to use; txt - the text to be displayed, null if none; columns - the number of columns to use to calculate the preferred width >= 0. If columns is set to zero, the preferred width will be whatever naturally results from the component implementation.

Method Detail

getUIClassID

public String getUIClassID()

Returns the name of the L&F class that renders this component.

Overrides:: getUIClassID in class JTextField

Returns:: "PasswordFieldUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

getEchoChar

public char getEchoChar()

Returns the character to be used for echoing. The default is '*'.

Returns:: the echo character, 0 if unset
See Also:: setEchoChar(char), echoCharIsSet()

setEchoChar

public void setEchoChar(char c)

Sets the echo character for this JPasswordField. Note that this is largely a suggestion to the view as the view that gets installed can use whatever graphic techniques it desires to represent the field. Setting a value of 0 unsets the echo character.

Parameters:: c - the echo character to display
See Also:: echoCharIsSet(), getEchoChar()

echoCharIsSet

public boolean echoCharIsSet()

Returns true if this JPasswordField has a character set for echoing. A character is considered to be set if the echo character is not 0.

Returns:: true if a character is set for echoing
See Also:: setEchoChar(char), getEchoChar()

cut

public void cut()

Normally transfers the currently selected range in the associated text model to the system clipboard, removing the contents from the model. This is not a good thing for a password field and is reimplemented to simply beep.

Overrides:: cut in class JTextComponent

copy

public void copy()

Normally transfers the currently selected range in the associated text model to the system clipboard, leaving the contents in the text model. This is not a good thing for a password field and is reimplemented to simply beep.

Overrides:: copy in class JTextComponent

getText

public String getText()

Deprecated. As of Java 2 platform v1.2, replaced by getPassword().

Returns the text contained in this TextComponent. If the underlying document is null, will give a NullPointerException.

For security reasons, this method is deprecated. Use the getPassword method instead.

Overrides:: getText in class JTextComponent

Returns:: the text

getText

public String getText(int offs,
                      int len)
               throws BadLocationException

Deprecated. As of Java 2 platform v1.2, replaced by getPassword().

Fetches a portion of the text represented by the component. Returns an empty string if length is 0.

For security reasons, this method is deprecated. Use the getPassword method instead.

Overrides:: getText in class JTextComponent

Parameters:: offs - the offset >= 0; len - the length >= 0
Returns:: the text
Throws:: BadLocationException - if the offset or length are invalid

getPassword

public char[] getPassword()

Returns the text contained in this TextComponent. If the underlying document is null, will give a NullPointerException. For stronger security, it is recommended that the returned character array be cleared after use by setting each character to zero.

Returns:: the text

paramString

protected String paramString()

Returns a string representation of this JPasswordField. 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 JTextField

Returns:: a string representation of this JPasswordField.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JPasswordField. For password fields, the AccessibleContext takes the form of an AccessibleJPasswordField. A new AccessibleJPasswordField instance is created if necessary.

Overrides:: getAccessibleContext in class JTextField

Returns:: an AccessibleJPasswordField that serves as the AccessibleContext of this JPasswordField

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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javax.swing Class JPasswordField

JPasswordField

JPasswordField

JPasswordField

JPasswordField

JPasswordField

getUIClassID

getEchoChar

setEchoChar

echoCharIsSet

cut

copy

getText

getText

getPassword

paramString

getAccessibleContext

javax.swing
Class JPasswordField