Scott McKnight's Blog

unsw

yousilin — Thu, 09 Sep 2010 13:57:00 +0000

Gonna Sleep

yousilin — Wed, 08 Sep 2010 17:17:00 +0000

Java is Powerful. I am not efficiency in writing java code, but that’s all right.Finish it tomorrow!

Just try to publish a post through email

yousilin — Wed, 08 Sep 2010 12:42:00 +0000

Just try to publish a post through email,

nothing else.

–
/**
*@You Silin
*More Info:
*http://www.google.com/profiles/yousilin

*My Blog:

*http://www.mc-k.info
*/

Useful Eclipse Shortcut Keys

yousilin — Wed, 08 Sep 2010 12:07:00 +0000

Ctrl+Shift+T

Find Java Type

Start typing the name and the list gets smaller. Try typing the capital letters of the class only (e.g. type “CME” to find “ConcurrentModificationException”)

Ctrl+Shift+R

Find Resource

Use this to look for XML files, text files, or files of any other type. which are in your workspace.

Ctrl+E

Open Editor Drop-Down

Presents a popup window listing currently opened files. Start typing to limit the list or simply use the down arrow key.

Ctrl+O

Quick Outline

Use this to find a method or a member variable in a class. Start typing to limit the choices. Press Ctrl+O a second time to include inherited methods.

Ctrl+Space

Content Assist

Context sensitive content completion suggestions while editing Java code.

Ctrl+Shift+Space

Context Information

If typing a method call with several parameters use this to show the applicable parameter types. The current parameter where the cursor is will be shown in bold.

Ctrl+Shift+O

Organize Imports

After typing a class name use this shortcut to insert an import statement. This works if multiple class names haven’t been imported too.

Open Declaration

Drills down to the declaration of the type, method, or variable the cursor is on. This works much like a browser hyperlink.

Alt+Left

Backward History

This works like a browser’s Back button.

Alt+Right

Forward History

This works like a browser’s Forward button

Ctrl+L

Go to Line

Go to a specific line number.

Open Type Hierarchy

Show the type hierarchy (downward tree) or the supertype hierarchy (upward tree).

Ctrl+Alt+H

Open Call Hierarchy

Show where a method is called from. In the Call Hierarchy view keep expanding the tree to continue tracing the call chain.

Ctrl+H

Open Search Dialog

Opens a search dialog with extensive search options for Java packages, types, methods, and fields.

Alt+Shift+R

Rename – Refactoring

Use this to rename type, method, or field. All existing references will be refactored as well.

Alt+Shift+L

Extract Local Variable

Use this to create a local variable from the selected expression. This is useful for breaking up larger expressions to avoid long lines.

Alt+Shift+M

Extract Method

Use this to extract a new method from existing code. The parameter list and return type will be automatically created.

Alt+Shift+Up
Alt+Shift+Down
Alt+Shift+Left
Alt+Shift+Right

Select Enclosing Element / Restore Last Selection / Select Previous Element /
Select Next Element

Useful for selecting context-sensitive blocks (e.g. surrounding loop, method, class, etc.)

Ctrl+Up
Ctrl+Down

Scroll Line Up / Scroll Line Down

Very handy if you want to scroll by 1 line without changing your cursor position or using the mouse.

Ctrl+Shift+U
Alt+Shift+U

Go to Previous Member / Go to Next Member

Great for stepping down through the methods of a Java source file.

Ctrl+Shift+U
Alt+Shift+U

Show Occurrences in File / Remove Occurrences Annotations

Use this to search within the same file – useful for occurrences of private fields and methods.

Ctrl+Shift+P

Go to Matching Bracket

Helps to find the closing bracket of lengthly if-else statements.

Ctrl+J
Ctrl+Shift+J

Incremental Find / Reverse Incremental Find

The first matching occurrence is shown with each typed letter. Press again and the next matching occurrence is shown.

Shift+Enter
Ctrl+Shift+Enter

Insert Line Below / Insert Line Above

Insert a line above or below the current line.

Ctrl+/
Ctrl+\

Add Block Comment / Remove Block Comment

Comment in/out blocks of code with a key stroke.

Ctrl+M

Maximize Active View or Editor

Maximize the current view or editor at the expense of all other currently shown views. Press again to restore to normal view.

Ctrl+F6
Ctrl+F7
Ctrl+F8

Next Editor / Next View / Next Perspective

Learn these to switch among edited files, open views and perspectives.

Ctrl+Alt+Up
Ctrl+Alt+Down

Duplicate Lines / Copy Lines

Doesn’t seem like it at first but a great shortcut once you learn to use it. Instead of select, copy and paste simply select and duplicate without affecting the clipboard.

Alt+/

Word Completion

This is excellent for code editing or writing plain help files with variables and other words having no English language equivalents. The word completion is based on the set of words already present in the current file.

Ctrl+I

Correct Indentation

Select a block of Java code or an entire class file and use this shortcut to correct its indentation.

TOO LATE

yousilin — Tue, 07 Sep 2010 19:39:00 +0000

EVERY TIME, IT IS TOO LATE WHEN YOU SLEEP

windows netsh command

yousilin — Tue, 07 Sep 2010 17:42:00 +0000

netsh interface ipv4 show interfaces

Example result:
Idx Met MTU State Name
— — —– ———– ——————-
1 50 4294967295 connected Loopback Pseudo-Interface 1
9 20 1500 connected Local Area Connection

netsh interface ipv4 show interface 9
Example result:
Interface Local Area Connection Parameters
———————————————-
IfLuid : ethernet_7
IfIndex : 9
Compartment Id : 1
State : connected
Metric : 20
Link MTU : 1500 bytes
Reachable Time : 19000 ms Base Reachable Time : 30000 ms Retransmission Interval : 1000 ms
DAD Transmits : 3 Site Prefix Length : 64 Site Id : 1 Forwarding : disabled
Advertising : disabled Neighbor Discovery : enabled Neighbor Unreachability
Detecion : enabled Router Discovery : dhcp Managed Address Configuration :
enabled Other Stateful Configuration : enabled Weak Host Sends : disabled Weak
Host Receives : disabled Use Automatic Metric : enabled Ignore Default routes :
disabled

Why is there no ARP reply in the packet trace

yousilin — Tue, 07 Sep 2010 15:38:00 +0000

>Hello
> I’m having a situation concerning Arp where i am seeing no Arp
>reply’s to many arp requests on my network when i evaluate with a
>protocol analyzer. I think the arp traffic may be at a level where it
>is disrupting traffic on the network and nodes are dropping off as a
>result. It is a microsoft 2000/xp network running active directory.
>The sniffs show alot of whois arp traffic and i see little or no arp
>reply’s with the mac address. I’m wondering what this could be due
>too. It is a flat network with 175 nodes running a class b subnet.
>Wins and Dns are configured. The workstation nodes are mixed
>win2k/xp(majority being 2k), The servers are win2k. Is this high
>amount of arp traffic(between 60 to 90 percent at a server)normal and
>if not what could i do to facilitate the arp reply’s. Thanks

How is your protocol analyzer connected to the network? If you’re on a
switch, it would be logical that you don’t see ARP reply’s.

The ARP requests are in the fowm of a broadcast, so sent to every
port. However, the reply is sent as an unicast to the host which made
the ARP request.

Unless you configured a SPAN por, you won’t see this traffic on a
switched network. This would also explain why you see such a high
percentage of ARP requests: the unicast traffic isn’t captured by your
protocol analyzer.

With kind regards,

Patrick

The ARP Command -s

yousilin — Tue, 07 Sep 2010 15:27:00 +0000

arp -s InetAddr EtherAddr

allows you to manually add an entry to the ARP cache that resolves the IP address InetAddr to the physical address EtherAddr.

Some Information About Studying Abord

yousilin — Tue, 12 Jan 2010 12:48:09 +0000

国家公派留学管理信息平台

2010年国家公派专项研究生奖学金项目一览表及项目指南

湖南大学研究生院

神奇的蝌蚪编码

yousilin — Tue, 12 Jan 2010 05:26:07 +0000

“见过这个“/ۙۚۚۙۨۡ۟ۘۛۙۨۜ۫ۙ۠ۢۚۡۛۛ۠ۡۡۗۚۨۚۚۗۖۡۡۧۛۧۚۤۤۖۙۧ۠۫۫ ”符号吗？看起来像是一个字符，但实际是很多字符重叠在了一起，有人利用这个原理制作了一个蝌蚪解码器，可以把一段话编码在一个字符的宽度里。通过这个办法，可以很好的保护敏感内容不被过滤。为了防止程序被滥用，作者限制了输入内容必须在4K字节以内，这对于普通的信息传播而言应该是足够了。另外这个程序还有英文版。”

摘自：http://developers.solidot.org/article.pl?sid=10/01/08/0312200&from=rss