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Message:
Like A Dog With A Clone
Posted by Matt Gerrans on January 22, 2002 at 12:55 AM
Well, I cranked out a quick 'n' dirty clone() vs. new performance test and, as expected, new was the hands-down winner. By an order of magnitude, no less. Of course, this test is completely unscientific, since there are, as usual, many other factors to consider, such as garbage collection, the Heisenberg Uncertainty Principal and the Coriolis Effect. Try it yourself: (After compiling, run it with "java CloneTest new|clone [N]", where you choose to test new or clone. You can optionally specify the number of operations to perform (the default is 10 million).
// CloneSpeed.javaclass CloneSpeed implements Cloneable
{
public static void main( String [] args )
{
if( args.length > 0 && (args[0].equals("new") || args[0].equals("clone")) )
{
long start = System.currentTimeMillis();
int loops = 10000000;
if( args.length > 1 )
loops = Integer.parseInt( args[1] ); if( args[0].equals("new") )
newTest( loops );
else if( args[0].equals("clone") )
cloneTest( loops ); System.out.println("That took " + (System.currentTimeMillis()-start)/1000.0 + " seconds." );
}
else
System.out.println("Specify new or clone.");
} static void newTest( int loops )
{
System.out.println("Doing " + loops + " loops of new..." );
CloneSpeed o = new CloneSpeed(); for( int i = loops; i > 0; i-- )
o = new CloneSpeed();
} static void cloneTest( int loops )
{
System.out.println("Doing " + loops + " loops of clone()..." );
CloneSpeed o = new CloneSpeed(); for( int i = loops; i > 0; i-- )
try
{
o = (CloneSpeed)o.clone();
}
catch(CloneNotSupportedException cnse)
{
System.out.println( "How could this error ever occur? And why is it a checked exception?" );
}
}
}
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