Package netscape.security.util
Class BitArray
- java.lang.Object
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- netscape.security.util.BitArray
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public class BitArray extends java.lang.Object
A packed array of booleans.- Version:
- 1.2 97/12/10
- Author:
- Joshua Bloch, Douglas Hoover
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Constructor Summary
Constructors Constructor Description BitArray(boolean[] bits)
Create a BitArray whose bits are those of the given array of Booleans.BitArray(int length)
Creates a BitArray of the specified size, initialized to zeros.BitArray(int length, byte[] a)
Creates a BitArray of the specified size, initialized from the specified byte array.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
clone()
boolean
equals(java.lang.Object obj)
boolean
get(int index)
Returns the indexed bit in this BitArray.int
hashCode()
Returns a hash code value for this bit array.int
length()
Returns the length of this BitArray.void
set(int index, boolean value)
Sets the indexed bit in this BitArray.boolean[]
toBooleanArray()
Return a boolean array with the same bit values a this BitArray.byte[]
toByteArray()
Returns a Byte array containing the contents of this BitArray.java.lang.String
toString()
Returns a string representation of this BitArray.
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Constructor Detail
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BitArray
public BitArray(int length) throws java.lang.IllegalArgumentException
Creates a BitArray of the specified size, initialized to zeros.- Throws:
java.lang.IllegalArgumentException
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BitArray
public BitArray(int length, byte[] a) throws java.lang.IllegalArgumentException
Creates a BitArray of the specified size, initialized from the specified byte array. The most significant bit of a[0] gets index zero in the BitArray. The array a must be large enough to specify a value for every bit in the BitArray. In other words, 8*a.length >= length.- Throws:
java.lang.IllegalArgumentException
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BitArray
public BitArray(boolean[] bits)
Create a BitArray whose bits are those of the given array of Booleans.
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Method Detail
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get
public boolean get(int index) throws java.lang.ArrayIndexOutOfBoundsException
Returns the indexed bit in this BitArray.- Throws:
java.lang.ArrayIndexOutOfBoundsException
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set
public void set(int index, boolean value) throws java.lang.ArrayIndexOutOfBoundsException
Sets the indexed bit in this BitArray.- Throws:
java.lang.ArrayIndexOutOfBoundsException
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length
public int length()
Returns the length of this BitArray.
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toByteArray
public byte[] toByteArray()
Returns a Byte array containing the contents of this BitArray. The bit stored at index zero in this BitArray will be copied into the most significant bit of the zeroth element of the returned byte array. The last byte of the returned byte array will be contain zeros in any bits that do not have corresponding bits in the BitArray. (This matters only if the BitArray's size is not a multiple of 8.)
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equals
public boolean equals(java.lang.Object obj)
- Overrides:
equals
in classjava.lang.Object
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toBooleanArray
public boolean[] toBooleanArray()
Return a boolean array with the same bit values a this BitArray.
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hashCode
public int hashCode()
Returns a hash code value for this bit array.- Overrides:
hashCode
in classjava.lang.Object
- Returns:
- a hash code value for this bit array.
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clone
public java.lang.Object clone()
- Overrides:
clone
in classjava.lang.Object
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toString
public java.lang.String toString()
Returns a string representation of this BitArray.- Overrides:
toString
in classjava.lang.Object
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