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October 7, 2008
 

Learning Java...

Since I have been tinkering around with Java I find myself using the Javadocs a lot. It contains valuable information as well as an introduction to Java technology lessons. So if you are interested in getting started make sure you have the latest Java SDK (JDK) installed and have the environment system variable set to the correct path.

Here is some good information about JDK 6 Documentation. It is awesome, it tells you what is where! If you are in need of more info then visit the New to Java Programming Center.

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Filed under  //   JAVA   JavaDocs   JDK  
Posted by Samson Loo 

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October 4, 2008
 

Java FileReader, FileWriter & BufferedReader...

I have been tinkering around with Java's FileReader, FileWriter & BufferedReader; however, this time I will use screen shots to illustrate parts of the code instead of pasting it and formatting it to fit nicely. Extremely time consuming...not like this post will be quick either! So here we go...not sure if I am going to enjoy this post.

1) We instantiate the FileWriter
2) My output file will be "numbers.dat"

3) Write numbers from 1 to 100 separated by "," commas to the "numbers.dat" file

4) Close the FileWriter

5) Instantiate the FileReader

6) Instantiate the BufferedReader

7) Pass data from Buffer to textData variable

8) For Schnitz'N'Giggles for you (Beer Fest) bloaks, let's display all even numbers from 1-100 on the screen

9) Close Buffer

10) Instantiate a second FileWriter

11) Append all odd numbers from 1-100 to "numbers.dat"

12) Close the second FileWriter

13) Instantiate a second FileReader

14) Instantiate a second BufferedReader

15) Pass Buffered data to textData variable

16) Print results to screen

End Results...JOptionPane Window prompts

Create "numbers.dat" file prompt

Display even numbers prompt

Append odd numbers to "numbers.dat" prompt

Display final results prompt

Proof file was created!

Screen output! (Even numbers highlighted)

File data content! (Appended numbers highlighted)

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Filed under  //   BufferedReader   FileReader   FileWriter   JAVA  
Posted by Samson Loo 

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September 22, 2008
 

Java Centimeters to Inches Calc...

As before here is the Java version of the Centimeters to Inches calculator.

[ Main.java ]
public class Main
{
   public static void main(String[] args)
   {
      GetUserInput.GetInput();
   }
}

[ GetUserInput.java ]
import java.util.*;
public class GetUserInput
{
   static void GetInput()
   {
      String strUserInput;
      Scanner in = new Scanner(System.in);
      System.out.print("Enter Centimeters: ");
      strUserInput = in.nextLine();
      in.close();
      ConvertUserInput.ConvertInput(strUserInput);
   }
}

[ ConvertUserInput.java ]
public class ConvertUserInput
{
   static void ConvertInput(String s)
   {
      double d;
      d = Double.parseDouble(s);
      PerformCalculation.Calculate(d);
   }
}

[ PerformCalculation.java ]
public class PerformCalculation
{
   static void Calculate(double i)
   {
      double cm = 0.393700787;
      double total;
      total = (i * cm);
      DisplayResults.Results(total);
   }
}

[ DisplayResults.java ]
public class DisplayResults
{
   static void Results(double r)
   {
      System.out.println("total Inches: " + r);
   }
}

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Filed under  //   cm to in conversion   console application   JAVA  
Posted by Samson Loo 

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September 15, 2008
 

Hello User Java Edition Console App...

import java.util.*;
public class HelloUser
{
   public static void main(String[] args)
   {
      GetUserInput();
   }
   private static void GetUserInput()
   {
      String strInput;
      Scanner in = new Scanner(System.in);
      System.out.println("Enter your first name: ");
      strInput = in.nextLine();
      in.close();
      System.out.println("Hello " + strInput);
   }
}

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Filed under  //   hello user   JAVA  
Posted by Samson Loo 

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September 15, 2008
 

Hello World Java Edition Console App..

As you can see the syntax is similar to that of C#

public class HelloWorld
{
   public static void main(String[] args)
   {
      Greeting();
   }
   private static void Greeting()
   {
      System.out.println("Hello world!");
   }
}

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Filed under  //   Hello World   JAVA  
Posted by Samson Loo 

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