Java程序性能测试

long  start=System.currentTimeMillis();
doSth();
long  end=System.currentTimeMillis();
System.out.println("time  lasts  "+(end-start)+"ms");  

public  interface  Foo  {
public  void  testArrayList();
public  void  testLinkedList();
}  

public  class  FooImpl  implements  Foo  {
private  List  link=new  LinkedList();
private  List  array=new  ArrayList();
public  FooImpl()  {
for(int  i=0;i<10000;i++)  {
array.add(new  Integer(i));
link.add(new  Integer(i));
}
}
public  void  testArrayList()  {
for(int  i=0;i<10000;i++)
array.get(i);
}
public  void  testLinkedList()  {
for(int  i=0;i<10000;i++)
link.get(i);
}
}  

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.*;
public class Handler implements InvocationHandler {
private Object obj;
public Handler(Object obj) {
this.obj = obj;
}
public static Object newInstance(Object obj) {
Object result =
Proxy.newProxyInstance(obj.getClass().getClassLoader(), 
     obj.getClass().getInterfaces(), new Handler(obj));
return (result);
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result;
try {
System.out.print("begin method " + method.getName() + "(");
for (int i = 0; args != null && i < args.length; i++) {
if (i > 0) System.out.print(",");
System.out.print(" " + args[i].toString());
}
System.out.println(" )");
long start=System.currentTimeMillis();
result = method.invoke(obj, args);
long end=System.currentTimeMillis();
System.out.println("the method "+method.getName()+" lasts "+(end-start)+"ms");
} catch (InvocationTargetException e) {
throw e.getTargetException();
} catch (Exception e) {
throw new RuntimeException("unexpected invocation exception: " + e.getMessage());
} finally {
System.out.println("end method " + method.getName());
}
return result;
}
} 

public  class  TestProxy  {
public  static  void  main(String[]  args)  {
try  {
Foo  foo  =  (Foo)  Handler.newInstance(new  FooImpl());
foo.testArrayList();
foo.testLinkedList();
}  catch  (Exception  e)  {
e.printStackTrace();
}
}
}

begin  method  testArrayList(  )
the  method  testArrayList  lasts  0ms
end  method  testArrayList
begin  method  testLinkedList(  )
the  method  testLinkedList  lasts  219ms
end  method  testLinkedList