全方位测试 Python、Java运行速度比较(1)

Test

Java

Python

Comparison

Standard Output

138.85

30.58

Python 4.5X Faster than Java

Hashtable

17.0

8.22

Python 2X Faster than Java

I/O

56.72

47.36

Python 1.2X Faster than Java

List

5.94

14.32

Java 2.4X Faster than Python

Native Methods

2.475

7.92

Java 3.2X Faster than Python

Interpreter Initialisation

0.25

0.04

Python 6.3X Faster than Java

Object Allocation

23.65

211.11

Java 8X Faster than Python

Interpreter Speed

0.43

2.29

Java 5.3X Faster than Python

ConsoleTest

Python

Java

for x in xrange(1000000):

    print x

public class ConsoleTest {

    public static void main(String[] args) {

        for (int i = 0; i < 1000000; i++) {

            System.out.println(i);

        }

    }

}

Hashtest

Python

Java

for i in xrange(1000):

    x={}

    for j in xrange(1000):

        x[j]=i

        x[j]

import java.util.Hashtable;

public class HashTest {

    public static void main(String[] args) {

        for (int i = 0; i < 1000; i++) {

            Hashtable x = new Hashtable();

            for (int j = 0; j < 1000; j++) {

                x.put(new Integer(i), new Integer(j));

                x.get(new Integer(i));

            }

        }

    }

}

IOTest

Python

Java

f=open('scratch','wb')

for i in xrange(1000000):

    f.write(str(i))

f.close()

import java.io.*;

public class IOTest

{

    public static void main(String[] args) {

        try {

            File f = new File("scratch");

            PrintWriter ps = new PrintWriter(new OutputStreamWriter

                                             (new FileOutputStream(f)));

            for (int i = 0; i < 1000000; i++) {

                ps.print(String.valueOf(i));

            }

            ps.close();

        }

        catch(IOException ioe) {

            ioe.printStackTrace();

        }

    }

}

ListTest

Python

Java

for i in xrange(1000):

    v=['a','b','c','d','e','f','g']

    for j in xrange(1000):

        v.append(j)

        v[j]

import java.util.Vector;

public class ListTest {

    public static void main(String[] args) {

        for (int i = 0; i < 1000; i++) {

            Vector v = new Vector();

            v.addElement("a");

            v.addElement("b");

            v.addElement("c");

            v.addElement("d");

            v.addElement("e");

            v.addElement("f");

            v.addElement("g");

            for (int j = 0; j < 1000; j++) {

                v.addElement(new Integer(j));

                v.elementAt(j);

            }

        }

    }

}