com.amazonaws.services.cloudfront.model

Class ViewerCertificate

java.lang.Object

com.amazonaws.services.cloudfront.model.ViewerCertificate

All Implemented Interfaces:

Serializable

public class ViewerCertificate
extends Object
implements Serializable

A complex type that contains information about viewer certificates for this distribution.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ViewerCertificate()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj)
Boolean	getCloudFrontDefaultCertificate() If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true.
String	getIAMCertificateId() If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution.
String	getMinimumProtocolVersion() Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections.
String	getSSLSupportMethod() If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests.
int	hashCode()
Boolean	isCloudFrontDefaultCertificate() If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true.
void	setCloudFrontDefaultCertificate(Boolean cloudFrontDefaultCertificate) If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true.
void	setIAMCertificateId(String iAMCertificateId) If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution.
void	setMinimumProtocolVersion(MinimumProtocolVersion minimumProtocolVersion) Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections.
void	setMinimumProtocolVersion(String minimumProtocolVersion) Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections.
void	setSSLSupportMethod(SSLSupportMethod sSLSupportMethod) If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests.
void	setSSLSupportMethod(String sSLSupportMethod) If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests.
String	toString() Returns a string representation of this object; useful for testing and debugging.
ViewerCertificate	withCloudFrontDefaultCertificate(Boolean cloudFrontDefaultCertificate) If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true.
ViewerCertificate	withIAMCertificateId(String iAMCertificateId) If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution.
ViewerCertificate	withMinimumProtocolVersion(MinimumProtocolVersion minimumProtocolVersion) Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections.
ViewerCertificate	withMinimumProtocolVersion(String minimumProtocolVersion) Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections.
ViewerCertificate	withSSLSupportMethod(SSLSupportMethod sSLSupportMethod) If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests.
ViewerCertificate	withSSLSupportMethod(String sSLSupportMethod) If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ViewerCertificate

public ViewerCertificate()

Method Detail

getIAMCertificateId

public String getIAMCertificateId()

If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution. Specify either this value or CloudFrontDefaultCertificate.

Returns:

If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution. Specify either this value or CloudFrontDefaultCertificate.

setIAMCertificateId

public void setIAMCertificateId(String iAMCertificateId)

If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution. Specify either this value or CloudFrontDefaultCertificate.

Parameters:

iAMCertificateId - If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution. Specify either this value or CloudFrontDefaultCertificate.

withIAMCertificateId

public ViewerCertificate withIAMCertificateId(String iAMCertificateId)

If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution. Specify either this value or CloudFrontDefaultCertificate.

Returns a reference to this object so that method calls can be chained together.

Parameters:

iAMCertificateId - If you want viewers to use HTTPS to request your objects and you're using an alternate domain name in your object URLs (for example, https://example.com/logo.jpg), specify the IAM certificate identifier of the custom viewer certificate for this distribution. Specify either this value or CloudFrontDefaultCertificate.

Returns:

A reference to this updated object so that method calls can be chained together.

isCloudFrontDefaultCertificate

public Boolean isCloudFrontDefaultCertificate()

If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

Returns:

If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

setCloudFrontDefaultCertificate

public void setCloudFrontDefaultCertificate(Boolean cloudFrontDefaultCertificate)

If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

Parameters:

cloudFrontDefaultCertificate - If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

withCloudFrontDefaultCertificate

public ViewerCertificate withCloudFrontDefaultCertificate(Boolean cloudFrontDefaultCertificate)

If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

Returns a reference to this object so that method calls can be chained together.

Parameters:

cloudFrontDefaultCertificate - If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

Returns:

A reference to this updated object so that method calls can be chained together.

getCloudFrontDefaultCertificate

public Boolean getCloudFrontDefaultCertificate()

If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

Returns:

If you want viewers to use HTTPS to request your objects and you're using the CloudFront domain name of your distribution in your object URLs (for example, https://d111111abcdef8.cloudfront.net/logo.jpg), set to true. Omit this value if you are setting an IAMCertificateId.

getSSLSupportMethod

public String getSSLSupportMethod()

If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Constraints:
Allowed Values: sni-only, vip

Returns:

If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

See Also:

SSLSupportMethod

setSSLSupportMethod

public void setSSLSupportMethod(String sSLSupportMethod)

If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Constraints:
Allowed Values: sni-only, vip

Parameters:

sSLSupportMethod - If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

See Also:

SSLSupportMethod

withSSLSupportMethod

public ViewerCertificate withSSLSupportMethod(String sSLSupportMethod)

If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Returns a reference to this object so that method calls can be chained together.

Constraints:
Allowed Values: sni-only, vip

Parameters:

sSLSupportMethod - If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Returns:

A reference to this updated object so that method calls can be chained together.

See Also:

SSLSupportMethod

setSSLSupportMethod

public void setSSLSupportMethod(SSLSupportMethod sSLSupportMethod)

If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Constraints:
Allowed Values: sni-only, vip

Parameters:

sSLSupportMethod - If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

See Also:

SSLSupportMethod

withSSLSupportMethod

public ViewerCertificate withSSLSupportMethod(SSLSupportMethod sSLSupportMethod)

If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Returns a reference to this object so that method calls can be chained together.

Constraints:
Allowed Values: sni-only, vip

Parameters:

sSLSupportMethod - If you specify a value for IAMCertificateId, you must also specify how you want CloudFront to serve HTTPS requests. Valid values are vip and sni-only. If you specify vip, CloudFront uses dedicated IP addresses for your content and can respond to HTTPS requests from any viewer. However, you must request permission to use this feature, and you incur additional monthly charges. If you specify sni-only, CloudFront can only respond to HTTPS requests from viewers that support Server Name Indication (SNI). All modern browsers support SNI, but some browsers still in use don't support SNI. Do not specify a value for SSLSupportMethod if you specified true for CloudFrontDefaultCertificate.

Returns:

A reference to this updated object so that method calls can be chained together.

See Also:

SSLSupportMethod

getMinimumProtocolVersion

public String getMinimumProtocolVersion()

Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Constraints:
Allowed Values: SSLv3, TLSv1

Returns:

Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

See Also:

MinimumProtocolVersion

setMinimumProtocolVersion

public void setMinimumProtocolVersion(String minimumProtocolVersion)

Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Constraints:
Allowed Values: SSLv3, TLSv1

Parameters:

minimumProtocolVersion - Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

See Also:

MinimumProtocolVersion

withMinimumProtocolVersion

public ViewerCertificate withMinimumProtocolVersion(String minimumProtocolVersion)

Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Returns a reference to this object so that method calls can be chained together.

Constraints:
Allowed Values: SSLv3, TLSv1

Parameters:

minimumProtocolVersion - Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Returns:

A reference to this updated object so that method calls can be chained together.

See Also:

MinimumProtocolVersion

setMinimumProtocolVersion

public void setMinimumProtocolVersion(MinimumProtocolVersion minimumProtocolVersion)

Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Constraints:
Allowed Values: SSLv3, TLSv1

Parameters:

minimumProtocolVersion - Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

See Also:

MinimumProtocolVersion

withMinimumProtocolVersion

public ViewerCertificate withMinimumProtocolVersion(MinimumProtocolVersion minimumProtocolVersion)

Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Returns a reference to this object so that method calls can be chained together.

Constraints:
Allowed Values: SSLv3, TLSv1

Parameters:

minimumProtocolVersion - Specify the minimum version of the SSL protocol that you want CloudFront to use, SSLv3 or TLSv1, for HTTPS connections. CloudFront will serve your objects only to browsers or devices that support at least the SSL version that you specify. The TLSv1 protocol is more secure, so we recommend that you specify SSLv3 only if your users are using browsers or devices that don't support TLSv1. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using dedicated IP (if you specify vip for SSLSupportMethod), you can choose SSLv3 or TLSv1 as the MinimumProtocolVersion. If you're using a custom certificate (if you specify a value for IAMCertificateId) and if you're using SNI (if you specify sni-only for SSLSupportMethod), you must specify TLSv1 for MinimumProtocolVersion.

Returns:

A reference to this updated object so that method calls can be chained together.

See Also:

MinimumProtocolVersion

toString

public String toString()

Returns a string representation of this object; useful for testing and debugging.

Overrides:

toString in class Object

Returns:

A string representation of this object.

See Also:

Object.toString()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object