Skip to main content

Sending arguments into Java native application

THE PROBLEM: Write a program that will read an input file mentioned in your command line, and display several lines of text from the input file.

THE SAMPLE OUTPUT:

image

In this tutorial we need simple code editor (Notepad++) and JDK (Java Development Kits). If you’re using Mac, JDK is already available inside (read more for Mac user).

SETTING THE JAVA PATH

In Windows environment, if you’d like to use the command line to compile (JAVAC) and execute a java class (JAVA) you need to set the Java home PATH.

Find the Java installation folder, for example: C:\Program Files\Java\jdk1.6.0_29\bin

This is the folder where the JAVAC and JAVA program is available.

location of Javac and Java applicationFigure 1

Right-click MyComputer icon on your desktop, and select Properties. Click the Environment Variables as in Figure 2.

environment variablesFigure 2

In the system variables, select PATH and click EDIT button (Figure 3).

changing pathFigure 3

Add the Java bin path to the Variable Value: C:\Program Files\Java\jdk1.6.0_29\bin as in Figure 4. Use the semicolon “;” to separate different variable value.

changing pathFigure 4

STEP 1: THE CODE SAMPLE

Use Notepad++ or your favourite code editor to key-in this code. This program will actually read an input file mentioned in your command line, and display several lines of text from the input file.

Java source code: Head.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class Head {

//declare the BufferdReader to read the input file
private static BufferedReader failin;
public static void main (String args[]) throws IOException{

//baris - the content of each lines in the input file
String baris;
//lines - the number of lines of the input text from the file
//that will be displayed
int lines=Integer.parseInt(args[0]);
//filen - name of the file send by the user thru command prompt
String filen=args[1];
int i=0;

//try catch any file input error
try{
failin=new BufferedReader (new FileReader(filen));
//extract one line at a time
while((baris=failin.readLine())!=null){

System.out.println(baris);
i++;
if (i==lines){
System.exit(0);
}
}
}
//if any error on fetching the file, print here
catch(IOException e){
System.out.println("Ralat "+e.toString());
}
}

}


STEP 2: CREATE THE INPUT TEXT


input.txt


Before you can start having fun programming in Java, 
you need to download
and install
the Java SE Development Kit.
The JDK is the most important Java download
you can make because once it's installed,
your computer will be able
to understand and execute
the programs you create.

Save these files in a folder in your storage, for example C:\kamarul

Java source code filesFigure 5


STEP 3: COMPILE


Launch the command prompt by typing cmd in the Start Button search.


run cmdFigure 6


And you will see this black screen.


imageFigure 7


Type cd\ <Enter> to get back to C:\ prompt (refer Figure 7).


One you get to C:\ , go inside your folder (which is kamarul) by typing cd kamarul <Enter> (as in Figure 8).


imageFigure 8


Run dir to check the content of your folder (as in Figure 9).


imageFigure 9


To compile Head.java, type



javac Head.java


and <Enter> (Figure 10).


compile java code using JAVACFigure 10


Run dir, to list all files. Now you can see Head.class . This Java bytecode file is produced from the compilation proses using JAVAC (Figure 11).


imageFigure 11


STEP 4: EXECUTE


Now use JAVA to execute the Head.class (this file contain the Java bytecode).



java Head 3 info.txt


The sample output are displayed in Figure 12 and 13.


run Java Bytecode using JAVAFigure 12


output - read an input file mentioned in your command line, and display several linesFigure 13

Comments

Popular posts from this blog

Several English proverbs and the Malay pair

Or you could download here for the Malay proverbs app – https://play.google.com/store/apps/details?id=net.kerul.peribahasa English proverbs and the Malay pair Corpus Reference: Amir Muslim, 2009. Peribahasa dan ungkapan Inggeris-Melayu. DBP, Kuala Lumpur http://books.google.com.my/books/about/Peribahasa_dan_ungkapan_Inggeris_Melayu.html?id=bgwwQwAACAAJ CTRL+F to search Proverbs in English Definition in English Similar Malay Proverbs Definition in Malay 1 Where there is a country, there are people. A country must have people. Ada air adalah ikan. Ada negeri adalah rakyatnya. 2 Dry bread at home is better than roast meat home's the best hujan emas di negeri orang,hujan batu di negeri sendiri Betapa baik pun tempat orang, baik lagi tempat sendiri. 3 There's no accounting for tastes We can't assume that every people have a same feel Kepala sama hitam hati lain-lain. Dalam kehidupan ini, setiap insan berbeza cara, kesukaan, perangai, tabia

Contact Us at blog.kerul.net

Powered by EMF HTML Contact Form

The Challenges of Handling Proverbs in Malay-English Machine Translation – a research paper

*This paper was presented in the 14th International Conference on Translation 2013 ( http://ppa14atf.usm.my/ ). 27 – 29 August 2013, Universiti Sains Malaysia, Penang. The PDF version is here: www.scribd.com/doc/163669571/Khirulnizam-The-Challenges-of-Automated-Detection-and-Translation-of-Malay-Proverb The test data is here: http://www.scribd.com/doc/163669588/Test-Data-for-the-Research-Paper-the-Challenges-of-Handling-Proverbs-in-Malay-English-Machine-Translation Khirulnizam Abd Rahman, Faculty of Information Science & Technology, KUIS Abstract: Proverb is a unique feature of Malay language in which a message or advice is not communicated indirectly through metaphoric phrases. However, the use of proverb will cause confusion or misinterpretation if one does not familiar with the phrases since they cannot be translated literally. This paper will discuss the process of automated filtering of Malay proverb in Malay text. The next process is translation. In machine translatio

Online database thru JSON in Android Studio

The tutorial is about how to connect Android apps and online database using the JSON formatted data interchange. The server facilities and JSON encoded data has been explained in the previous tutorials; ( Android and JSON Insert , Android and JSON Search ). The overview concept of JSON data inter change. JSON formatted data sample First we look at our database structure for this project. Part A: The online database The table is training, and this is the structure. There is a PHP script that generate a JSON encoded data from the above table. The PHP script to generate JSON formatted data; <?php //search.php /* * Following code will search training based on keywords */ // array for JSON response $response = array (); // include connect class require_once __DIR__ . '/connect.php' ; // connecting to db $db = new DB_CONNECT(); $keyword = $_GET [ "keyword" ]; // get idioms based on keyword //using LIKE $result =

Submit your blog address here

Create your own blog and send the address by submitting the comment of this article. Make sure to provide your full name, matrix and URL address of your blog. Refer to the picture below. Manual on developing a blog using blogger.com and AdSense, download here … Download Windows Live Writer (a superb offline blog post editor)