Whats new in JDK 7

Below are some new features in JDK 7

• NIO 2.0 The java.nio.file package and its related package, java.nio.file.attribute, provide comprehensive support for file I/O and for accessing the file system.
• Sockets Direct Protocol Sockets Direct Protocol (SDP) is a wire protocol developed to support stream connections over InfiniBand fabric.
• Compressed 64-bit object pointers. A technique for compressing 64-bit pointers to fit into 32 bits, which decreases memory and memory-bandwidth consumption and thereby improves performance
• VM support for non-Java languages. VM extensions to support the implementation of non-Java languages at performance levels near to that of the Java language itself.
• Garbage-First GC. A new garbage collector that promises to achieve lower pause times and better predictability than the current CMS collector

Using regular expressions in Java

Below is an example of using Java's regular expression functionality to replace the spaces inside of a parenthesis with a underscore:

String inputStr = "1 (2 3) 4 (5 6) 7 8 9";
String thePatternStr = "\\([\\w\\d\\s]*\\)";
Pattern pattern = Pattern.compile(thePatternStr);
Matcher matcher = pattern.matcher(inputStr);
StringBuffer sb = new StringBuffer();
while(matcher.find())
{
String match = matcher.group();
String matchWithUnderscore = match.replace(' ', '_');
matcher.appendReplacement(sb, matchWithUnderscore);
}
matcher.appendTail(sb);
System.out.println("Input string: " + inputStr);
System.out.println("Modified string: " + sb.toString());

This should give the following output:

Input string: 1 (2 3) 4 (5 6) 7 8 9
Modified string: 1 (2_3) 4 (5_6) 7 8 9

Using regular expressions in Java

Below is an example of using Java's regular expression functionality to replace the spaces inside of a parenthesis with a underscore:

String inputStr = "1 (2 3) 4 (5 6) 7 8 9";
String thePatternStr = "\\([\\w\\d\\s]*\\)";
Pattern pattern = Pattern.compile(thePatternStr);
Matcher matcher = pattern.matcher(inputStr);
StringBuffer sb = new StringBuffer();
while(matcher.find())
{
String match = matcher.group();
String matchWithUnderscore = match.replace(' ', '_');
matcher.appendReplacement(sb, matchWithUnderscore);
}
matcher.appendTail(sb);
System.out.println("Input string: " + inputStr);
System.out.println("Modified string: " + sb.toString());

This should give the following output:

Input string: 1 (2 3) 4 (5 6) 7 8 9
Modified string: 1 (2_3) 4 (5_6) 7 8 9

Determine files that are modified

find . -mtime -1 -print

Using Awk to rename multiple files

The following awk script will rename files named like:

_TEST.ABC.123.XML.1231123

to the following

TEST.ABC.123.XML


for f in `ls _TEST*`
do
newfile=`echo $f | grep -o TEST.[A-Z]*.[0-9]*.XML`
mv $f $newfile
done

Utility for determining which files a program is using

The Process Explorer for Windows is a utility for determining which files an application is currently using. This can come in handy especially when you are trying to delete a file but cannot because some process is still using it. I highly recommend it. Below is the URL:


http://www.microsoft.com/technet/sysinternals/Utilities/ProcessExplorer.mspx

JVM parameters to use a debugger for Java

Below are the JVM arguements that can be used to allow a debugger to connect to your Java application

-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=port

Drop all tables for Microsoft SQL Server

Resource: John's Blog

WHILE EXISTS(SELECT [name] FROM sys.tables WHERE [type] = 'U')
BEGIN
DECLARE @table_name varchar(50)
DECLARE table_cursor CURSOR FOR SELECT [name] FROM sys.tables WHERE [type] = 'U'
OPEN table_cursor
FETCH NEXT FROM table_cursor INTO @table_name
WHILE @@FETCH_STATUS = 0
BEGIN
BEGIN TRY
EXEC ('DROP TABLE [' + @table_name + ']')
PRINT 'Dropped Table ' + @table_name
END TRY
BEGIN CATCH END CATCH
FETCH NEXT FROM table_cursor INTO @table_name
END
CLOSE table_cursor
DEALLOCATE table_cursor
END