New Features of Java 7

Java 7 contains many new features, enhancements and bug fixes to improve efficiency to develop and run Java programs.

Here is a brief summary of the enhancements included with the Java 7 release:

• Improved performance, stability and security.
• Enhancements in the Java Plug-in for Rich Internet Applications development and deployment.
• Java Programming language enhancements that enable developers with ease of writing and optimizing the Java code.
• Enhancements in the Java Virtual machine to support Non-Java languages.

In this article, we will explore some of those capabilities through code samples.

1. Binary literals

You can use the binary number system (0s and 1s) to express integral types byte, short, int, and long. To specify a binary value, prefix the value with a 0b or 0B.


--------------------- Output ---------------------

a = -88

b = 112

c = 73

d = 1467

2. Underscore literals

To improve readability of numeric literals in the code, you can use underscores between digits to separate a group of digits. You can use as many underscores as you need.


--------------------- Output ---------------------

a = -86

b = 4554

c = 123456789

d = 111222333

e = 11.227799

Java program to create doc/docx file

Apache POI can be used to create a doc/docx file. To know more click here.

You can download latest version of jar files(i.e. poi-bin-3.10-FINAL-20140208.zip) form below link.
http://poi.apache.org/download.html

Add below mentioned Jar files in your classpath -

• poi-3.10-FINAL-20140208.jar
• poi-ooxml-3.10-FINAL-20140208.jar
• poi-ooxml-schemas-3.10-FINAL-20140208.jar
• poi-scratchpad-3.10-FINAL-20140208.jar
• xmlbeans-2.3.0.jar
• dom4j-1.6.1.jar

Please see the self explanatory java code below

Java program to read doc/docx file

Apache POI can be used to read doc/docx file. To know more click here.

You can download latest version of jar files(i.e. poi-bin-3.10-FINAL-20140208.zip) form below link.
http://poi.apache.org/download.html

Add below mentioned Jar files in your classpath -

• poi-3.10-FINAL-20140208.jar
• poi-ooxml-3.10-FINAL-20140208.jar
• poi-ooxml-schemas-3.10-FINAL-20140208.jar
• poi-scratchpad-3.10-FINAL-20140208.jar
• xmlbeans-2.3.0.jar
• dom4j-1.6.1.jar

Please see the self explanatory java code below

Shell script - function to split a string based on a delimiter

#!/bin/ksh

#function to split a string based on a delimiter
function split {

        string=$1
        delimiter=$2

echo "split string '"$string"' with delimiter '"$delimiter"'"
        for word in $(echo $string | tr "$delimiter" "\n")
        do
                echo $word
        done
}

#call the split function with arguments string and delimiter
split "transient;private;protected;public;synchronized;native" ";"

split "float|short|char|double" "|"

UNIX/LINUX - How to encrypt/decrypt a text file

crypt command can be used to encrypt/decrypt a particular text file in UNIX/LINUX. It is a simple encryption algorithm which works on a secret-key basis. It encrypts or decrypts a stream of data from standard input, and writes the result to standard output. Encryption and decryption is a symmetric process.

Encryption
This will create an encrypted file enTextFile.txt  from a text file textFile.txt. You can use either of the commands both does one and the same task.

crypt ENCRYPTION_KEY < textFile.txt > enTextFile.txt

OR

cat textFile.txt | crypt > enTextFile.txt

Decryption
This will decrypt an encrypted file enTextFile.txt and store the output in textFile.txt

crypt ENCRYPTION_KEY < enTextFile.txt (to show data on console)
crypt ENCRYPTION_KEY < enTextFile.txt > textFile.txt

OR

cat enTextFile.txt | crypt > textFile.txt