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Java System Properties from

is sometimes important to know the characteristics of the system where we run our programs to evaluate the performance that he may have or just for informational purposes. Class System java.lang package allows us to use the following method:

static String getProperty ( String var)
Returns the system property specified by var. Java.version

version of Java Development Environment (JRE). Java.vendor
Name JRE distribution. Java.home
Installation directory of the virtual machine. Os.name
OS Name . Os.arch
Operating system architecture.
os.version Operating system version. User.name
system user name. User.home
User directory path of the system. Java.vm.name
Name installed virtual machine. Java.vm.version
version of the virtual machine installed.

These and other properties of the system can be found on page javadoc the method getProperties () .

addition, the System also provides the following method:

static String getenv ( String var) Lets see the value

a system environment variable specified.

For the environment variables in Ubuntu, in a terminal write the instruction "env" and press ENTER. While we see the environment variables this link for Windows.

In the images we see alguan obtained properties apart from some properties: Properties

Ubuntu system

System Properties in XP

Code Source: Propiedades.java

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Equality Minister sought declaration of February 22 as "International Day for the Equal Pay '

Equality Minister Bibiana Aido, the general director of the Institute for Youth, an organization under the Ministry of Gender, Gabriel Alconchel, and President of the Confederation English Association of Young Entrepreneurs (CEAJE), Patricio Rodríguez-Carmona, this morning signed a collaboration agreement for the launch of an online platform for training and mentoring to promote self-employment for young people. Equality Minister explained that "We aim to facilitate the creation of projects entrepreneurship among youth through training and advisory processes with free and virtually. " Aido has rated this tool as very necessary because "despite the economic times we live, young people are creating businesses." This follows from the study on status, challenges and proposals to the crisis by CEAJE developed under the collaboration agreement signed with the Injuve in 2009, which reflects the 30.11% of young entrepreneurs has set up his business in the past year and a half. For his part, President of CEAJE added that this authorization service will also allow young people to share and discuss with other entrepreneurs, thereby consolidating their powers. "We will accompany the young from developing the business idea and making a business plan, through the establishment and implementation of the project until its first year of life." The collaboration between CEAJE Injuve and has a history of 10 years that have signed several cooperation agreements and has developed a program called "Business Incubator", with the participation of AJEBASK-Araba, which has enabled the creation of a large number of companies, 222 companies and has served more than 4,460 young people demanding information, advice and training. The English Confederation of Associations of Young Entrepreneurs, CEAJE, is a non-profit, national and intersectoral, born in 1991 in order to spread the entrepreneurial culture and awareness of the importance of business and the figure of the young entrepreneur in society. The organization currently comprises more than 18,500 young entrepreneurs scattered in 46 provincial organizations, chairing the Committee for the Promotion of Entrepreneurship of CEOE, took the chair of Yes for Europe and chairs the American Federation of Young Entrepreneurs (SET).

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SOURCE: Ministry @ Equal Calle Alcalá, 37 Madrid
LINK:
http://www.migualdad.es/ss/Satellite?c=MIGU_NotaPrensa_FA&cid=1244647566440&language=cas_ES&pageid=1193047406588&pagename=MinisterioIgualdad% 2FMIGU_NotaPrensa_FA% 2FMIGU_notaPrensa & title = The + Ministry + of + Equality + and + the + Confederate% C3% B3n + de + J% C3% B3venes + Business + promote + the + initiative + business

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arrangements.

Em Java also can use dimensional arrays (vectors) also can make use of two-dimensional arrays (matrices). How to create and declare the two-dimensional arrays is similar to the creation and reporting dimensional arrays.

The syntax for declaring the two-dimensional arrays is as follows:

nombre_arreglo data_type [] [] = new data_type [ rows] [columns ] / / 1st way

data_type [] [] = new name under data_type [ rows] [columns ] / / 2nd way

where data_type corresponds one of the primitive data types in Java (boolean, int, shot, long, byte, char, float or double) or objects (String, Object or defined).

nombre_arreglo is a valid ID for Java with which we use the two-dimensional array.

As for the one-dimensional arrangements to go a Java-dimensional array indices always start at 0. In addition, we use the length attribute to determine the number of rows and columns of a matrix.

matrix multiplication.

A practical example of operations with matrices (two dimensional arrays in Java) is to perform the multiplication of the elements of a matrix by another matrix elements. The following link is a video exemplifies the process for performing matrix multiplications.

http://www.youtube.com/watch?v=GhLKJqHlxoM

The following code in the Java language performs multiplication of two matrices. NOTE: One of the rules for multiplication of matrices is that the number of columns in the first matrix must equal the number of rows in the second, as explained in the video. Therefore, the rows and columns indicate different matrices, multiplication is not performed.

Multiplicacion.java

Finally, I add a program, filling a matrix of n by m integers with random values \u200b\u200band then inverting the matrix content and presents it on screen. The method of reversing the content is to take a line or row of the matrix and reverse its contents, then move to the next line and perform the same procedure. And so on until the n rows of the matrix. Later the same process applies now to the columns.


Matrices.java

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To delve further into the issue of treatment of chains talk a little about the String class, perhaps for many people is a basic data type (rough) Java, however most are about objects of type string that allows us to manipulate text quickly and easily.

separately created objects of the String class can be initialized, among many other manner described in the Java documentation , as follows:

String string1, String string2 =

"This is a test message ";

string3

String = new String (" Hello World ");

String string4 = new String (string2);

course , as the other objects in Java, the String class has a number of methods for manipulating strings, some of these methods are:

char charAt ( int index) Returns the character

of a string in the position indicated by index. The index value must be a positive integer.

int compareTo ( String string)

Compare a string with another string, the return value is an integer that indicates the result of comparing two strings. This result is expressed by the ASCII value of character of the original string being compared with the second chain with an arithmetic subtraction. In summary, when comparing the characters of two strings with this method does the following:

- Suppose we have two strings that are declared and values:

string1 = "Sum"; ASCII Values : 83117109 97
string2 = "sum"; ASCII values: ; - 115 117   109   97
                                                                    -------------------------------
                                                            -32 0 0 0

As can be seen, the result of the comparison between the first two characters ('S' and 's') we cast a negative value, which means that the chain compareTo "Sum" is less than " sum. " By detecting a change in the process of comparing the characters of two strings stops the execution of the method and returns the result. Int

compareToIgnoreCase ( String string)

Make a comparison between two strings ignoring if the strings are written in uppercase or lowercase . Like the compareTo method returns an integer value indicating the result of the comparison with the process described above.

String concat ( String string)

Allows concatenation of two strings.

boolean endsWith (String suffix)

Compares the contents of a string ends with the same sequence of characters that the indicated suffix.

boolean equals ( Object object)

Compare a string with the specified object.

boolean equalsIngoreCase ( String string)

Compares a string with another to see if they are identical and returns t rue if so, otherwise returns false .

byte [] getBytes () Converts

chain in a sequence of bytes storing the conversion back to an array of bytes.

void GetChars ( iniCadena int, int finCadena, char [] destination, int posDestino)

Copy the contents of a string delimited by start and end positions indicated iniCadena and finCadena with a target character array from the position indicated in posDestino.

int indexOf (int character)

Returns the index value of the specified character within a string.

int indexOf (int character, int index) Returns

index value of the specified character within a string starting the search beyond a specified index. Failure to find matches with the character you sought will return a -1 .

int indexOf ( String string)

Returns the value of the index where it begins a specified substring within a string.

int indexOf (String chain int index) Returns

index value which starts a specified substring within a string starting the search beyond a specified index. Failure to find matches to substring is searched returns a -1 .

int lastIndexOf ( int character)

Returns the value of the index of the last character found within a specified string.

int lastIndexOf (int character, int index) Returns the value

index the last character found within a specified search string beginning other than a specified index. Failure to find matches with the character you sought will return a -1 .

int lastIndexOf ( String string)

Returns the value of the index where it begins the last specified substring within a string.

int lastIndexOf (String chain int index) Returns

index value which starts the last substring specified within a string starting the search beyond a specified index. Failure to find matches to substring is searched returns a -1 .

int length ()

Returns the length of the string.

String replace ( char character, char nuevoCaracter)

Returns a string resulting from replacing all occurrences of the character specified by a new character.

String replaceAll ( String string, String replacement)

Returns a string resulting from replacing all occurrences of the string specified by a new string.

replaceFirst String (String chain String replacement) Replaces

first locate substring in a string with a replacement and return all the new chain.

boolean startsWith ( String prefix)

Checks if a string starts with the specified prefix.

boolean startsWith ( String prefix, int position)

Checks if the string starts with the prefix specified separately in an index.

String substring (int start) Returns a substring

apart from an index and length of the string until it invokes the method.

String substring (int beginning , int end) Returns a substring

apart from an initial rate to a final figure given.

char [] toCharrArray ()

Converts a string into an array of characters.

String toLowerCase ()

Convert string to lowercase. If the entire chain is originally lower returns the string in the same way, does not affect the method invocation.

String toUpperCase ()

Similar to toLowerCase () with the difference that this method converts a string to uppercase and returns the conversion.

String valueOf ( Object object)

Returns the string representation of an object.

Within the next file is performed test of the above methods.

Cadenas.java

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