# Class PasswordCallback

java.lang.Object
javax.security.auth.callback.PasswordCallback

All Implemented Interfaces:
  `Serializable, Callback`

public class PasswordCallback extends Object implements Callback, Serializable

Underlying security services instantiate and pass a `PasswordCallback` to the `handle` method of a `CallbackHandler` to retrieve password information.

Since:
  1.4
See Also:
  - `CallbackHandler`
  - Serialized Form

## Constructor Summary

Constructors
Constructor
Description
`PasswordCallback(String prompt, boolean echoOn)`
Construct a `PasswordCallback` with a prompt and a boolean specifying whether the password should be displayed as it is being typed.

## Method Summary

Modifier and Type
Method
Description
`void`
`clearPassword()`
Clear the retrieved password.
`char[]`
`getPassword()`
Get the retrieved password.
`String`
`getPrompt()`
Get the prompt.
`boolean`
`isEchoOn()`
Return whether the password should be displayed as it is being typed.
`void`
`setPassword(char[] password)`
Set the retrieved password.

### Methods declared in class Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

## Constructor Details

### PasswordCallback

public PasswordCallback(String prompt, boolean echoOn)
Construct a `PasswordCallback` with a prompt and a boolean specifying whether the password should be displayed as it is being typed.

Parameters:
  `prompt` - the prompt used to request the password.
  `echoOn` - true if the password should be displayed as it is being typed.
Throws:
  `IllegalArgumentException` - if `prompt` is null or if `prompt` has a length of 0.

## Method Details

### getPrompt

public String getPrompt()
Get the prompt.

Returns:
  the prompt.

### isEchoOn

public boolean isEchoOn()
Return whether the password should be displayed as it is being typed.

Returns:
  the whether the password should be displayed as it is being typed.

### setPassword

public void setPassword(char[] password)
Set the retrieved password.

This method makes a copy of the input `password` before storing it.

Parameters:
  `password` - the retrieved password, which may be null.
See Also:
  - `getPassword()`

### getPassword

public char[] getPassword()
Get the retrieved password.

This method returns a copy of the retrieved password.

Returns:
  the retrieved password, which may be null.
See Also:
  - `setPassword(char[])`

### clearPassword

public void clearPassword()
Clear the retrieved password.