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 separately to make it easier to safely change the UI for the JTextField without affecting password entries.
NOTE: By default, JPasswordField disables input methods; otherwise, input characters could be visible while they were composed using input methods. If an application needs the input methods support, please use the inherited method, enableInputMethods(true).
Warning: Swing is not thread safe. For more information see Swing's Threading Policy.
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. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans package. Please see XMLEncoder.
| Modifier and Type | Class and Description |
|---|---|
protected class |
JPasswordField.AccessibleJPasswordField This class implements accessibility support for the |
JTextField.AccessibleJTextField JTextComponent.AccessibleJTextComponent, JTextComponent.DropLocation, JTextComponent.KeyBinding JComponent.AccessibleJComponent Container.AccessibleAWTContainer Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy notifyAction DEFAULT_KEYMAP, FOCUS_ACCELERATOR_KEY listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH public JPasswordField()
Constructs a new JPasswordField, with a default document, null starting text string, and 0 column width.
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.
text - the text to be displayed, null if nonepublic 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.
columns - the number of columns >= 0public JPasswordField(String text,
int columns) Constructs a new JPasswordField initialized with the specified text and columns. The document model is set to the default.
text - the text to be displayed, null if nonecolumns - the number of columns >= 0public 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 '*', but may be changed by the current Look and Feel. If the document model is null, a default one will be created.
doc - the text storage to usetxt - the text to be displayed, null if nonecolumns - 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 implementationpublic String getUIClassID()
Returns the name of the L&F class that renders this component.
getUIClassID in class JTextField
JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)
public void updateUI()
Reloads the pluggable UI. The key used to fetch the new interface is getUIClassID(). The type of the UI is TextUI. invalidate is called after setting the UI.
updateUI in class JTextComponent
JComponent.setUI(javax.swing.plaf.ComponentUI), UIManager.getLookAndFeel(), UIManager.getUI(javax.swing.JComponent)
public char getEchoChar()
Returns the character to be used for echoing. The default is '*'. The default may be different depending on the currently running Look and Feel. For example, Metal/Ocean's default is a bullet character.
setEchoChar(char), echoCharIsSet()
public void setEchoChar(char c)
Sets the echo character for this JPasswordField. Note that this is largely a suggestion, since the view that gets installed can use whatever graphic techniques it desires to represent the field. Setting a value of 0 indicates that you wish to see the text as it is typed, similar to the behavior of a standard JTextField.
c - the echo character to displayechoCharIsSet(), getEchoChar()
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.
setEchoChar(char), getEchoChar()
public void cut()
Invokes provideErrorFeedback on the current look and feel, which typically initiates an error beep. The normal behavior of transferring the currently selected range in the associated text model to the system clipboard, and removing the contents from the model, is not acceptable for a password field.
cut in class JTextComponent
Toolkit.getSystemClipboard(), Clipboard
public void copy()
Invokes provideErrorFeedback on the current look and feel, which typically initiates an error beep. The normal behavior of transferring the currently selected range in the associated text model to the system clipboard, and leaving the contents from the model, is not acceptable for a password field.
copy in class JTextComponent
Toolkit.getSystemClipboard(), Clipboard
@Deprecated 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.
getText in class JTextComponent
JTextComponent.setText(java.lang.String)@Deprecated
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.
getText in class JTextComponent
offs - the offset >= 0len - the length >= 0BadLocationException - if the offset or length are invalidpublic 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.
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.
paramString in class JTextField
JPasswordField
public AccessibleContext getAccessibleContext()
Returns 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.
getAccessibleContext in interface Accessible
getAccessibleContext in class JTextField
AccessibleJPasswordField that serves as the AccessibleContext of this JPasswordField
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