Performance Test of JDK 1.5 General Type.

The tests were performed in JDK 1.4.2 and JDK 1.5, but the test results were unexpected. The same code, the use of generic performance has a small part of the decline.

It seems that Sun has to add hard to make JDK 1.5 become real "Tiger".

/ *

* Create a date 2004-10-6

* Author 2002pp

* /

Package code.test;

Import java.util.arraylist;

Import java.util.list;

/ **

* @Author 2002pp

* Under JDK 1.4.2

* /

Public Class PerformanceTestSt

{

/ ** Creates a new instance of performancetest * /

Public PerformanceTest ()

{

}

Public static void main (string [] args)

{

List list = new arraylist ();

Long beforeadd = system.currenttimemillis ();

INT end = 100000;

For (int i = 0; i

{

List.add (new integer (i));

}

Long Afteradd = system.currenttimemillis ();

For (int J = 0; j

{

Integer integer = (integer) list.get (j);

}

Long afterget = system.currenttimemillis ();

Double Addtime = (Afteradd - BeForeAdd) / 1000.0d;

Double getTime = (afterget - instradd) / 1000.0d;

System.out.println (

"java.version =" system.getproperty ("java.version"));

System.out.println ("Add Time:" AddTime);

System.out.println ("GET Time:" GetTime);

}

}

Result: java.version = 1.4.2

ADD Time: 0.125

GET time consumption: 0.016

/ *

* Create a date 2004-10-6

* Author 2002pp

* /

Package code.test;

Import java.util.arraylist;

Import java.util.list;

/ **

* @Author 2002pp

* Under JDK 1.5

* /

Public Class PerformanceTestSt

{

/ ** Creates a new instance of performancetest * /

Public PerformanceTest () {

}

Public static void main (String [] args) {

List list = new arraylist ();

Long beforeadd = system.currenttimemillis ();

INT end = 100000;

For (INT I = 0; i

List.add (new integer (i));

}

Long Afteradd = system.currenttimemillis ();

For (int J = 0; j

}

Long afterget = system.currenttimemillis ();

System.out.println ("java.version =" system.getproperty ("java.version"));

Double Addtime = (Afteradd-BeforeAdd) / 1000.0d;

Double getTime = (afterget -Afteradd) / 1000.0d;

System.out.println ("Add Time:" AddTime);

System.out.println ("GET Time:" GetTime);

}

}

Result: java.version = 1.5.0

ADD time consumption: 0.14

GET time consumption: 0.016