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ByteComparator (Colt 1.2.0 - API Specification)
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cern.colt.function</FONT>
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Interface ByteComparator</H2>
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<DL>
<DT>public interface <B>ByteComparator</B></DL>
<P>
A comparison function which imposes a <i>total ordering</i> on some
collection of elements. Comparators can be passed to a sort method (such as
<tt>cern.colt.Sorting.quickSort</tt>) to allow precise control over the sort order.<p>
Note: It is generally a good idea for comparators to implement
<tt>java.io.Serializable</tt>, as they may be used as ordering methods in
serializable data structures. In
order for the data structure to serialize successfully, the comparator (if
provided) must implement <tt>Serializable</tt>.<p>
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>0.1 01/09/99</DD>
<DT><B>See Also:</B><DD><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Comparator.html" title="class or interface in java.util"><CODE>Comparator</CODE></A>,
<A HREF="../../../cern/colt/Sorting.html" title="class in cern.colt"><CODE>Sorting</CODE></A></DL>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../cern/colt/function/ByteComparator.html#compare(byte, byte)">compare</A></B>(byte o1,
byte o2)</CODE>
<BR>
Compares its two arguments for order.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../cern/colt/function/ByteComparator.html#equals(java.lang.Object)">equals</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> obj)</CODE>
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Indicates whether some other object is "equal to" this
Comparator.</TD>
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<A NAME="compare(byte, byte)"><!-- --></A><H3>
compare</H3>
<PRE>
public int <B>compare</B>(byte o1,
byte o2)</PRE>
<DL>
<DD>Compares its two arguments for order. Returns a negative integer,
zero, or a positive integer as the first argument is less than, equal
to, or greater than the second.<p>
The implementor must ensure that <tt>sgn(compare(x, y)) ==
-sgn(compare(y, x))</tt> for all <tt>x</tt> and <tt>y</tt>. (This
implies that <tt>compare(x, y)</tt> must throw an exception if and only
if <tt>compare(y, x)</tt> throws an exception.)<p>
The implementor must also ensure that the relation is transitive:
<tt>((compare(x, y)>0) && (compare(y, z)>0))</tt> implies
<tt>compare(x, z)>0</tt>.<p>
Finally, the implementer must ensure that <tt>compare(x, y)==0</tt>
implies that <tt>sgn(compare(x, z))==sgn(compare(y, z))</tt> for all
<tt>z</tt>.<p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>a negative integer, zero, or a positive integer as the
first argument is less than, equal to, or greater than the
second.</DL>
</DD>
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equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> obj)</PRE>
<DL>
<DD>Indicates whether some other object is "equal to" this
Comparator. This method must obey the general contract of
<tt>Object.equals(Object)</tt>. Additionally, this method can return
<tt>true</tt> <i>only</i> if the specified Object is also a comparator
and it imposes the same ordering as this comparator. Thus,
<code>comp1.equals(comp2)</code> implies that <tt>sgn(comp1.compare(o1,
o2))==sgn(comp2.compare(o1, o2))</tt> for every element
<tt>o1</tt> and <tt>o2</tt>.<p>
Note that it is <i>always</i> safe <i>not</i> to override
<tt>Object.equals(Object)</tt>. However, overriding this method may,
in some cases, improve performance by allowing programs to determine
that two distinct Comparators impose the same order.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the reference object with which to compare.
<DT><B>Returns:</B><DD><code>true</code> only if the specified object is also
a comparator and it imposes the same ordering as this
comparator.<DT><B>See Also:</B><DD><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang"><CODE>Object.equals(java.lang.Object)</CODE></A>,
<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang"><CODE>Object.hashCode()</CODE></A></DL>
</DD>
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