Open file using JFileChooser

Complete source code below will show you, how to open file using JFileChooser.

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COMPLETE SOURCE CODE FOR : OpenFileUsingJFileChooser.java
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/*
*Desktop class only can get when you use JDK 6
*/
import java.awt.Desktop;

import javax.swing.JFileChooser;

import java.io.File;

public class OpenFileUsingJFileChooser
{
public static void main(String[]args)
{
 //Create a file chooser
 JFileChooser fileChooser=new JFileChooser();

 //File chooser will appear in no windows parent
 int a=fileChooser.showOpenDialog(null);

 //Action that will take when user click open button
 if(a==JFileChooser.APPROVE_OPTION)
 {
  //Get file that want to open
  File fileToOpen=fileChooser.getSelectedFile();

  try
  {
   //Open file using suitable program on computer.
   //You don't need to tell what program to use.
   //Java will select default program that your
   //computer use to open the file.
   //In windowsXP you can see what
   //program that your computer use to open
   //a file by right click on file,
   //choose properties and see at
   //Opens with : ProgramNameToOpenTheFile
   Desktop.getDesktop().open(fileToOpen);
  }
  catch(Exception exception)
  {
   System.out.println("Problem occour when to open the file");
  }
 }
}
}

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Open any file or folder using Desktop class

Complete source code below will show you, how to open C:\ drive using Desktop class. Desktop class is only can get when you use jdk 6.

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COMPLETE SOURCE CODE FOR : OpenFileUsingDesktopClass.java
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/*
*If you want to use Desktop class,
*you must make sure that jdk version
*that you use is 6. This facilities
*is exist in jdk 6.
*/
import java.awt.Desktop;

import java.io.File;

public class OpenFileUsingDesktopClass
{
public static void main(String[]args)
{
 try
 {
  //Open C:\ drive
  //Make sure that you change \ to \\
  //You can change to other file or folder that you want
  //Example for file that you want to open:
  //C:\Sunset.jpg
  //So, change C:\\ below to
  //C:\\Sunset.jpg
  Desktop.getDesktop().open(new File("C:\\"));
 }
 catch(Exception exception)
 {
  exception.printStackTrace();
 }
}
}

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Click here to download jdk6
Click here to download jdk6 documentation

Set JButton text color using UIManager

Complete source code below will show you, how to set JButton text color using UIManager. When you set JButton text color using this style, it will make all JButton in your program will have same text color. So, if you want to set only one text color for JButton, i suggest you click here.

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COMPLETE SOURCE CODE FOR : SetJButtonForegroundColorUseUiManager.java
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import javax.swing.UIManager;

import javax.swing.plaf.ColorUIResource;

import javax.swing.*;

import java.awt.*;

public class SetJButtonForegroundColorUseUiManager
{
public static void main(String[]args)
{
 /*
  *Create color base on RGB color model
  *that will use as JButton foreground color.
  *Red=255
  *Green=0
  *Blue=0
  */
 Color foregroundColor=new Color(255,0,0);

 //Set JButton foreground color
 UIManager.put("Button.foreground",new ColorUIResource(foregroundColor));

 //Create a window using JFrame with title ( Set JButton foreground color using UIManager )
 JFrame frame=new JFrame("Set JButton foreground color using UIManager");

 //Create two button
 JButton button1=new JButton("Button 1");
 JButton button2=new JButton("Button 2");

 //Set JFrame layout to FlowLayout
 frame.setLayout(new FlowLayout());

 //Add created button into frame
 frame.add(button1);
 frame.add(button2);

 //Set JFrame default close operation
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 //Set JFrame size
 frame.setSize(400,400);

 //Make JFrame locate at center
 frame.setLocationRelativeTo(null);

 //Make JFrame visible
 frame.setVisible(true);
}
}

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Open any file or folder in java

Complete source code will show you, how to open any files or folders using java in windows.What you must know is :


rundll32 SHELL32.DLL,ShellExec_RunDLL File_Or_Folder_To_Open


What is rundll32.exe And Why Is It Running?


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COMPLETE SOURCE CODE FOR : OpenFileUsingJava.java
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public class OpenFileUsingJava
{
public static void main(String[]args)
{
 try
 {
  //Path for folder or file that you want to open
  //In my case i will open C:\ drive
  //So create a String like below
  //Don't forget to change \ to \\
  String a="C:\\";
 
  //Execute command
  //Command that you must know : rundll32 SHELL32.DLL,ShellExec_RunDLL File_Or_Folder_To_Open
  Runtime.getRuntime().exec("rundll32 SHELL32.DLL,ShellExec_RunDLL \""+a+"\"");
 }
 catch(Exception exception)
 {
  exception.printStackTrace();
 }
}
}

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What is different between i++ and ++i

I want to share with you about different between i++ and ++i.

++i
**********
int i=0;
System.out.println(++i);
**********
It will print on screen 1


i++
**********
int i=0;
System.out.println(i++);
**********
It will print on screen 0

Answer :
++i will add current i value with 1 before print


i++ will add current i value with 1 after print

Draw triangle in JPanel

Complete source code below will show you, how to draw triangle in JPanel

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COMPLETE SOURCE CODE FOR : DrawTriangle.java
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import javax.swing.*;

import java.awt.*;

public class DrawTriangle extends JPanel
{
public DrawTriangle()
{
 JFrame frame=new JFrame("Draw triangle in JPanel");
 frame.add(this);

 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(400,400);
 frame.setLocationRelativeTo(null);
 frame.setVisible(true);
}

public void paint(Graphics g)
{
 super.paint(g);

 //All triangle corner x coordinate
 int[]x={0,150,300};

 //All triangle corner y coordinate
 int[]y={200,0,200};

 //Set color base on RGB
 //You can get RGB value for your color at "Color picker" at above
 //R=255
 //G=192
 //B=0
 //So after this all you draw will use this color
 g.setColor(new Color(255,192,0));

 //Draw triangle in JPanel
 g.fillPolygon(x,y,3);

 //Set color base on RGB
 //You can get RGB value for your color at "Color picker" at above
 //R=1
 //G=1
 //B=1
 //So after this all you draw will use this color
 g.setColor(new Color(1,1,1));

 //Set font that will use when draw String
 g.setFont(new Font("Arial",Font.BOLD,14));

 //Draw String in JPanel
 g.drawString("(0,200)",10,200);
 g.drawString("(150,0)",150,20);
 g.drawString("(300,200)",290,200);
}

public static void main(String[]args)
{
 DrawTriangle dt=new DrawTriangle();
}

}

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Compare current date with user input date in java

Complete source code below will show you, how to compare current date with user input date in java.

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COMPLETE SOURCE CODE FOR : GetDate.java
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import java.util.Date;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class GetDate implements ActionListener
{
int year=0;
int month=0;
int date=0;

String [] yearContent={"2000","2001","2002","2003","2004","2005","2006","2007","2008","2009","2010","2011"};
String [] monthContent={"January","February","March","April","Mei","Jun","July","August","September","October","November","December"};
String [] dateContent={"1","2","3","4","5","6","7","8","9","10",
    "11","12","13","14","15","16","17","18","19","20",
    "21","22","23","24","25","26","27","28","29","30",
    "31"};

JComboBox yearComboBox=new JComboBox(yearContent);
JComboBox monthComboBox=new JComboBox(monthContent);
JComboBox dateComboBox=new JComboBox(dateContent);

JButton button=new JButton("Click here to compare to current date");

JFrame frame=new JFrame("Compare date with current date");

public GetDate()
{
button.addActionListener(this);

Box box=Box.createHorizontalBox();
box.add(dateComboBox);
box.add(monthComboBox);
box.add(yearComboBox);

frame.setLayout(new GridLayout(2,1));

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(box);
frame.add(button);
frame.setSize(500,100);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}

public void actionPerformed(ActionEvent event)
{
if(event.getSource()==button)
{
 String tempDate=(String)dateComboBox.getSelectedItem();
 date=Integer.parseInt(tempDate);

 month=monthComboBox.getSelectedIndex();

 String tempYear=(String)yearComboBox.getSelectedItem();
 year=Integer.parseInt(tempYear)-1900;

 Date currentDateValue=new Date();
 Date userChooserDate=new Date(year,month,date);

 int currentYear=currentDateValue.getYear();
 int currentMonth=currentDateValue.getMonth();
 int currentDate=currentDateValue.getDate();

 if((date==currentDate)&&(month==currentMonth)&&(year==currentYear))
 {
  JOptionPane.showMessageDialog(frame,"Same date","SAME",JOptionPane.INFORMATION_MESSAGE);
 }
 else if(userChooserDate.compareTo(currentDateValue)<0)>0)
 {
  JOptionPane.showMessageDialog(frame,"Welcome to the future","FUTURE",JOptionPane.INFORMATION_MESSAGE);
 }
}
}

public static void main(String[]args)
{
GetDate gd=new GetDate();
}
}

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Input box in java

Complete source code below will show you, how to create simple input box that will prompt some input from user. We will use predefined java class, JOptionPane to create simple input box. If you want your input box appear in a container, you can change null in source code below to target container.You can see example by click here.

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COMPLETE SOURCE CODE FOR : JavaInputDialog.java
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import javax.swing.JOptionPane;

public class JavaInputDialog
{
public static void main(String[]args)
{
 //Pop up an input box with text ( What is your name ? )
 String a=JOptionPane.showInputDialog(null,"What is your name ?");

 //Print into command prompt what you put into input dialog box
 System.out.println("My name is : "+a);
}
}

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Message box appear in JFrame

Complete source code below will show you, how to make message box appear in a container.

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COMPLETE SOURCE CODE FOR : MessageBoxAppearInJFrame.java
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import javax.swing.JOptionPane;

import javax.swing.JFrame;

public class MessageBoxAppearInJFrame
{
public static void main(String[]args)
{
 //Create a window using JFrame with title ( Message box appear in JFrame )
 JFrame frame=new JFrame("Message box appear in JFrame");

 //Set default close operation for JFrame
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 //Set JFrame size
 frame.setSize(400,400);

 //Make JFrame locate at center on screen
 frame.setLocationRelativeTo(null);

 //Make JFrame visible
 frame.setVisible(true);


 //Pop up a message box with text ( I am a message dialog ) in created JFrame
 JOptionPane.showMessageDialog(frame,"I am a message dialog");
}
}

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Create message box in java

Complete source code below will show you, how to create message box in java. We will use JOptionPane class to create message box. If you want your message box appear in a container, you can change null in source code below to target container.You can see example by click here.

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COMPLETE SOURCE CODE FOR : JavaMessageDialog.java
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import javax.swing.JOptionPane;

public class JavaMessageDialog
{
public static void main(String[]args)
{
 //Pop up a message box with text ( I am a message dialog )
 JOptionPane.showMessageDialog(null,"I am a message dialog");
}
}

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