# Destroyable
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary:[Methods](https://developer.android.com/reference/javax/security/auth/Destroyable#pubmethods)
# Destroyable
`
public
interface
Destroyable
`
`
`
|---------------------------------|
| javax.security.auth.Destroyable |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Known indirect subclasses [DHPrivateKey](https://developer.android.com/reference/javax/crypto/interfaces/DHPrivateKey),[DSAPrivateKey](https://developer.android.com/reference/java/security/interfaces/DSAPrivateKey),[ECPrivateKey](https://developer.android.com/reference/java/security/interfaces/ECPrivateKey),[EdECPrivateKey](https://developer.android.com/reference/java/security/interfaces/EdECPrivateKey),[KeyStore.PasswordProtection](https://developer.android.com/reference/java/security/KeyStore.PasswordProtection),[PBEKey](https://developer.android.com/reference/javax/crypto/interfaces/PBEKey),[PrivateKey](https://developer.android.com/reference/java/security/PrivateKey),[RSAMultiPrimePrivateCrtKey](https://developer.android.com/reference/java/security/interfaces/RSAMultiPrimePrivateCrtKey),[RSAPrivateCrtKey](https://developer.android.com/reference/java/security/interfaces/RSAPrivateCrtKey),[RSAPrivateKey](https://developer.android.com/reference/java/security/interfaces/RSAPrivateKey),[SecretKey](https://developer.android.com/reference/javax/crypto/SecretKey),[SecretKeySpec](https://developer.android.com/reference/javax/crypto/spec/SecretKeySpec),[X500PrivateCredential](https://developer.android.com/reference/javax/security/auth/x500/X500PrivateCredential),[XECPrivateKey](https://developer.android.com/reference/java/security/interfaces/XECPrivateKey) |---------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [DHPrivateKey](https://developer.android.com/reference/javax/crypto/interfaces/DHPrivateKey) | The interface to a Diffie-Hellman private key. | | [DSAPrivateKey](https://developer.android.com/reference/java/security/interfaces/DSAPrivateKey) | The standard interface to a DSA private key. | | [ECPrivateKey](https://developer.android.com/reference/java/security/interfaces/ECPrivateKey) | The interface to an elliptic curve (EC) private key. | | [EdECPrivateKey](https://developer.android.com/reference/java/security/interfaces/EdECPrivateKey) | An interface for an elliptic curve private key as defined by[RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA)](https://tools.ietf.org/html/rfc8032). | | [KeyStore.PasswordProtection](https://developer.android.com/reference/java/security/KeyStore.PasswordProtection) | A password-based implementation of`ProtectionParameter`. | | [PBEKey](https://developer.android.com/reference/javax/crypto/interfaces/PBEKey) | The interface to a PBE key. | | [PrivateKey](https://developer.android.com/reference/java/security/PrivateKey) | A private key. | | [RSAMultiPrimePrivateCrtKey](https://developer.android.com/reference/java/security/interfaces/RSAMultiPrimePrivateCrtKey) | The interface to an RSA multi-prime private key, as defined in the[PKCS#1 v2.2](https://tools.ietf.org/rfc/rfc8017.txt)standard, using the*Chinese Remainder Theorem*(CRT) information values. | | [RSAPrivateCrtKey](https://developer.android.com/reference/java/security/interfaces/RSAPrivateCrtKey) | The interface to an RSA private key, as defined in the[PKCS#1 v2.2](https://tools.ietf.org/rfc/rfc8017.txt)standard, using the*Chinese Remainder Theorem*(CRT) information values. | | [RSAPrivateKey](https://developer.android.com/reference/java/security/interfaces/RSAPrivateKey) | The interface to an RSA private key. | | [SecretKey](https://developer.android.com/reference/javax/crypto/SecretKey) | A secret (symmetric) key. | | [SecretKeySpec](https://developer.android.com/reference/javax/crypto/spec/SecretKeySpec) | This class specifies a secret key in a provider-independent fashion. | | [X500PrivateCredential](https://developer.android.com/reference/javax/security/auth/x500/X500PrivateCredential) | This class represents an`X500PrivateCredential`. | | [XECPrivateKey](https://developer.android.com/reference/java/security/interfaces/XECPrivateKey) | An interface for an elliptic curve private key as defined by RFC 7748. | |
*** ** * ** ***
Objects such as credentials may optionally implement this interface to provide the capability to destroy its contents.
**See also:**
- [Subject](https://developer.android.com/reference/javax/security/auth/Subject)
## Summary
| ### Public methods ||
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` default void` | ` `[destroy](https://developer.android.com/reference/javax/security/auth/Destroyable#destroy())`() ` Destroy this`Object`. |
| ` default boolean` | ` `[isDestroyed](https://developer.android.com/reference/javax/security/auth/Destroyable#isDestroyed())`() ` Determine if this`Object`has been destroyed. |
## Public methods
### destroy
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void destroy ()
```
Destroy this`Object`.
Sensitive information associated with this`Object`is destroyed or cleared. Subsequent calls to certain methods on this`Object`will result in an`IllegalStateException`being thrown.
The default implementation throws`DestroyFailedException`.
Android note: Up to and including API 25 this method did not have a default implementation. Implementations of this interface must provide a concrete implementation of this method in order to work on older versions of Android.
| Throws ||
|--------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------|
| [DestroyFailedException](https://developer.android.com/reference/javax/security/auth/DestroyFailedException) | if the destroy operation fails.
|
| [SecurityException](https://developer.android.com/reference/java/lang/SecurityException) | if the caller does not have permission to destroy this`Object`. |
### isDestroyed
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean isDestroyed ()
```
Determine if this`Object`has been destroyed.
The default implementation returns false.
Android note: Up to and including API 25 this method did not have a default implementation. Implementations of this interface must provide a concrete implementation of this method in order to work on older versions of Android.
| Returns ||
|-----------|-----------------------------------------------------------------|
| `boolean` | true if this`Object`has been destroyed, false otherwise.
|