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Class ATR

java.lang.Object

javax.smartcardio.ATR

All Implemented Interfaces:: Serializable

public final class ATR extends Object implements Serializable

A Smart Card's answer-to-reset bytes. A Card's ATR object can be obtained by calling Card.getATR(). This class does not attempt to verify that the ATR encodes a semantically valid structure.

Instances of this class are immutable. Where data is passed in or out via byte arrays, defensive cloning is performed.

Since:

1.6

See Also:

Constructor Summary

Constructor	Description
`ATR(byte[] atr)`	Constructs an ATR from a byte array.

Method Summary

Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`	Compares the specified object with this ATR for equality.
`byte[]`	`getBytes()`	Returns a copy of the bytes in this ATR.
`byte[]`	`getHistoricalBytes()`	Returns a copy of the historical bytes in this ATR.
`int`	`hashCode()`	Returns the hash code value for this ATR.
`String`	`toString()`	Returns a string representation of this ATR.

Methods declared in class java.lang.Object

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

Constructor Details

ATR

public ATR(byte[] atr)

Constructs an ATR from a byte array.

Parameters:: atr - the byte array containing the answer-to-reset bytes
Throws:: NullPointerException - if atr is null

Method Details

getBytes

public byte[] getBytes()

Returns a copy of the bytes in this ATR.

Returns:: a copy of the bytes in this ATR.

getHistoricalBytes

public byte[] getHistoricalBytes()

Returns a copy of the historical bytes in this ATR. If this ATR does not contain historical bytes, an array of length zero is returned.

Returns:: a copy of the historical bytes in this ATR.

toString

public String toString()

Returns a string representation of this ATR.

Overrides:: toString in class Object
Returns:: a String representation of this ATR.

equals

public boolean equals(Object obj)

Compares the specified object with this ATR for equality. Returns true if the given object is also an ATR and its bytes are identical to the bytes in this ATR.

Overrides:

equals in class Object

Parameters:

obj - the object to be compared for equality with this ATR

Returns:

true if the specified object is equal to this ATR

See Also:

hashCode

public int hashCode()

Returns the hash code value for this ATR.

Overrides:

hashCode in class Object

Returns:

the hash code value for this ATR.

See Also:

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.smartcardio/javax/smartcardio/ATR.html