JAutorunKiller

You can use this small tool to remove autorun file(autorun.inf) that usually use by computer viruses to start their program from removable drive. This is not mean autorun file is a malicious file. Autorun file is always use in compact disc when disc creator want executable file in the compact disc execute when user click on cd drive icon.Click link below to download :
JAutorunKiller.jar

Free java decompiler

This is one of java decompiler that can be use to get java source file (file with .java as it's file extension) from any java class file (file with .class as it's file extension). Class file is a result after compiling process success without any syntax error.

Click link below to download

1. JD-GUI

2. Cavaj Java Decompiler

3. JCavaj Java Decompiler

Java get binary value from alphabet

Today, i have learned about how to get binary value from alphabet. You can try compile and execute java program below to get all binary value for A-Z and a-z.

::Click Here To Download File For This Tutorial::

*********************************************************************
COMPLETE SOURCE CODE FOR : JavaGetBinaryFromLetter.java
*********************************************************************

public class JavaGetBinaryFromLetter
{
public static void main(String[]args)
{
 String a="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

 for(int i=0;i<a.length();i++)
 {
  char b=a.charAt(i);
  int temp=(int)b;
  String c=Integer.toBinaryString(temp);
  System.out.println("BINARY VALUE FOR LETTER "+b+" IS : "+c);
 }
}
}

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Java ternary operator

Today i have learned about ternary operator in java. Before this, when i found it in java code, i will ask myself what it is and what we call it...now i will share with you what i understand about ternary operator.Now, see java code below

::Click Here To Download This Java Source Code::

************************************************************
COMPLETE SOURCE CODE FOR : JavaTernaryOperator.java
************************************************************

public class JavaTernaryOperator
{
public static void main(String[]args)
{
int a=0;
int b=4;
int c=5;

//THIS IS EXAMPLE OF TERNARY OPERATOR
a=(b>c?b:c);

System.out.println(a);
}
}

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In the java code above, example of ternary operator is a=(b>c?b:c);.So, what it mean ?

This is the answer :
Value a is equal to b if b larger than c or value a is equal to c if b smaller than c.So, java code above has same meaning with java code below.

::Click Here To Download This Java Source Code::

public class JavaTernaryOperator
{
public static void main(String[]args)
{
int a=0;
int b=4;
int c=5;

if(b>c)
{
 a=b;
}
else
{
 a=c;
}

System.out.println(a);
}
}

Now, you can choose which one you want to use when write your java program. It seem when we use ternary operator we can make our program more shorter.

Java hexadecimal to binary

Complete source code below is a simple java program that can be use to get binary value from hexadecimal value.

******************************************************************
COMPLETE SOURCE CODE FOR : JavaHexToBin.java
******************************************************************

::Click Here To Download This Java Source Code::

import java.util.Scanner;

public class JavaHexToBin
{
public static void main(String[]args)
{
 String[]hex={"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
 String[]binary={"0000","0001","0010","0011","0100","0101","0110","0111","1000","1001","1010","1011","1100","1101","1110","1111"};

 Scanner s=new Scanner(System.in);
 System.out.print("Put hex value : ");
 String userInput=s.next();
 String result="";
 for(int i=0;i<userInput.length();i++)
 {
  char temp=userInput.charAt(i);
  String temp2=""+temp+"";
  for(int j=0;j<hex.length;j++)
  {
   if(temp2.equalsIgnoreCase(hex[j]))
   {
    result=result+binary[j];
   }
  }
 }
 System.out.println("IT'S BINARY IS : "+result);
}
}

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Java determine pixel was clicked or not

Complete source code below just a simple java program that will determine if you was clicked or not on 8 black dots. If you was clicked , program will inform you that the dot was clicked.I hope you can see all 8 black dots that i mean because it is too small and try click on it to see what happen.

***************************************************************************
COMPLETE SOURCE CODE FOR : JavaDeterminePixelClicked.java
***************************************************************************

::Click Here To Download This Java Source Code::

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JavaDeterminePixelClicked extends Canvas implements MouseListener
{
 boolean [] con={ false,false,false,false,false,false,false,false };
 int[][]coor=new int[8][2];
 Robot r;
 
 public JavaDeterminePixelClicked()
 {
  addMouseListener(this);
  try
  {
   r=new Robot();
  }
  catch(Exception exception)
  {
   exception.printStackTrace();
  }

  JFrame a=new JFrame(">>>>>TRY CLICK AT BLACK DOT<<<<<");
  a.getContentPane().add(this,BorderLayout.CENTER);
  a.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
  a.setSize(500,500);
  a.setLocationRelativeTo(null);
  a.setVisible(true);
 }
 
 public void paint(Graphics g)
 {
  setBackground( new Color (255,255,255) );
  super.paint(g);
  g.setColor( new Color (0,0,0) );
  g.drawLine(30,30,30,30);
  g.drawLine(40,40,40,40);
  g.drawLine(50,50,50,50);
  g.drawLine(60,60,60,60);
  g.drawLine(70,70,70,70);
  g.drawLine(80,80,80,80);
  g.drawLine(90,90,90,90);
  g.drawLine(100,100,100,100);
 }
 
 public void mouseClicked(MouseEvent event)
 {
  Color temp=r.getPixelColor(event.getLocationOnScreen().x,event.getLocationOnScreen().y);
  if(temp.getRed()==0&&temp.getGreen()==0&&temp.getBlue()==0)
  {
   int upperLeftX=getLocationOnScreen().x;
   int upperLeftY=getLocationOnScreen().y;
   int currentX=event.getLocationOnScreen().x;
   int currentY=event.getLocationOnScreen().y;
   if(currentX-upperLeftX==30&¤tY-upperLeftY==30)
   {
    if(con[0]==false)
    {
     con[0]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==40&¤tY-upperLeftY==40)
   {
    if(con[1]==false)
    {
     con[1]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==50&¤tY-upperLeftY==50)
   {
    if(con[2]==false)
    {
     con[2]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==60&¤tY-upperLeftY==60)
   {
    if(con[3]==false)
    {
     con[3]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==70&¤tY-upperLeftY==70)
   {
    if(con[4]==false)
    {
     con[4]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==80&¤tY-upperLeftY==80)
   {
    if(con[5]==false)
    {
     con[5]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==90&¤tY-upperLeftY==90)
   {
    if(con[6]==false)
    {
     con[6]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
   if(currentX-upperLeftX==100&¤tY-upperLeftY==100)
   {
    if(con[7]==false)
    {
     con[7]=true;
    }
    else
    {
     JOptionPane.showMessageDialog(null,"This point was clicked");
    }
   }
  }
 }
 
 public void mouseEntered(MouseEvent event)
 {
  //NOTHING
 }
 
 public void mouseExited(MouseEvent event)
 {
  //NOTHING
 }
 
 public void mousePressed(MouseEvent event)
 {
  //NOTHING
 }
 
 public void mouseReleased(MouseEvent event)
 {
  //NOTHING
 }
 
 public static void main(String[]args)
 {
  JavaDeterminePixelClicked jdpc = new JavaDeterminePixelClicked ();
 }
}

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JUST COMPILE AND EXECUTE IT
***************************************************************************

Java get degree from radian

Complete source code below just a simple java program that we can use to get degree value from radian value.

*****************************************************************
COMPLETE SOURCE CODE FOR : GetDegreeFromRadian.java
*****************************************************************

::Click Here To Download This Java Source Code::

public class GetDegreeFromRadian
{
public static void main(String[]args)
{
 //CHANGE RADIAN VALUE TO WHAT VALUE THAT YOU WANT
 double radian=1.00;

 //PRINT ANGLE VALUE THAT WE GET FROM RADIAN
 System.out.println( "IT'S ANGLE IS : " + radian* (180/Math.PI) );
}
}

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JUST COMPILE AND EXECUTE IT
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Java receive user input and sort it in ascending order

Complete source code below is a simple java program that will receive user input and after that sort it in ascending order before display it's result.

*********************************************************************
COMPLETE SOURCE CODE FOR : AscendingString.java
*********************************************************************

::Click Here To Download This Java Source Code::

import java.util.Scanner;

public class AscendingString
{
public static void main(String[]args)
{
 Scanner s=new Scanner(System.in);
 String[]a=new String[5];
 for(int i=0;i<5;i++)
 {
  System.out.println(i+1+".Put your String");
  String temp=s.nextLine();
  a[i]=temp;
 }

 System.out.println("**********");
 System.out.println("RESULT");
 System.out.println("**********");

 for(int i=0;i<5;i++)
 {
  for(int j=0;j<5;j++)
  {
   String temp=a[i];
   String tempB=a[j];
   if(temp.compareTo(tempB)<0)
   {
    a[i]=tempB;
    a[j]=temp;
   }
  }
 }

 for(int i=0;i<5;i++)
 {
  System.out.println(a[i]);
 }
}
}

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Java recursive method

Sometime we need to solve a problem using the same way. For example you need to build a program that will print number from 1 until number that input by a user. First program will print number without using recursive technique and second program we will use recursive technique to print number from 1 until number that input by a user.You should see how a recursive method will do the same thing until problem solve.

FIRST PROGRAM :

::Click Here To Download This Java Source Code::

import java.util.Scanner;

public class Test
{
public static void main(String[]args)
{
Scanner s=new Scanner(System.in);
System.out.println("Put a number");
int a=s.nextInt();

System.out.println("IT'S RESULT");
System.out.println("***************");

for(int i=1;i<=a;i++)
{
System.out.println(i);
}
}
}

SECOND PROGRAM :
print method in PrintNumber class is example of recursive method.

::Click Here To Download This Java Source Code::

import java.util.Scanner;

public class Test
{
public static void main(String[]args)
{
Scanner s=new Scanner(System.in);
System.out.println("Put a number");
int myNumber=s.nextInt();
PrintNumber pn=new PrintNumber();
System.out.println("IT'S RESULT");
System.out.println("***************");
pn.print(myNumber);
}
}

class PrintNumber
{
public void print(int a)
{
if(a==1)
{
System.out.println(a);
}
else
{
int temp=a-1;
print(temp);
System.out.println(a);
}
}
}

For example if you put 2 into second program, when it enter print method in PrintNumber class, firstly program will check if the number is 1 or not. If not, the number will be minus with 1 before it send it's result to print method again. In this case it will send 1 to print method. So System.out.println(a) for a=2 will stop for a while until a=1. Now after it send 1 to print method, condition for a==1 will be true. 1 will be print, and System.out.println(a) for a=2 will continue again by print 2.

I hope it will help.

Set JOptionPane background color

After i make some review over internet and java forum lastly i understand how to change JOptionPane background color.You can try compile and execute simple code below and see it's result.

***************************************************************
COMPLETE SOURCE CODE FOR : SetJOptionPaneBackgroundColor.java
***************************************************************

::Click Here To Download This Java Source Code::

import javax.swing.JOptionPane;
import javax.swing.UIManager;

import javax.swing.plaf.ColorUIResource;

public class SetJOptionPaneBackgroundColor
{
public static void main(String[]args)
{
UIManager uim=new UIManager();
uim.put("OptionPane.background",new ColorUIResource(255,0,0));
uim.put("Panel.background",new ColorUIResource(255,0,0));

JOptionPane.showMessageDialog(null,"Hello world","HELLO WORLD",JOptionPane.INFORMATION_MESSAGE);
}
}

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