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Java Source Code / Java Documentation » Ajax » zk » org.zkoss.util

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Class Diagram

Java Document (Java Doc)

java.lang .Object

org.zkoss.util .IdentityComparator

IdentityComparator

public class IdentityComparator implements Comparator(Code)

The comparator uses == and System.identifyHashCode to compare two objects. It assumes if o1 != o2, then c1 != c2 where c1 = System.identityHashCode(o1).

This is useful if dynamic proxy is used with TreeSet or TreeMap (so equals is expensive). Reason: the speed of identifyHashCode is much faster than dynamic proxy (150:1).

However, if possible, java.util.IdentityHashMap and IdentityHashSet are preferred.
author:
tomyeh
See Also: IdentityHashSet

Constructor Summary
public	IdentityComparator()

Method Summary
public int	compare(Object o1, Object o2)

Constructor Detail

IdentityComparator
public IdentityComparator()(Code)

Method Detail

compare
public int compare(Object o1, Object o2)(Code)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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