Set JTextField background image

Complete source code below will show you, how to set image background in a JTextField. You can download image (textFieldBackgroundImage.jpg) that use in source code at below.

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

import java.awt.*;

public class SetJTextFieldBackgroundImage extends JTextField
{
public SetJTextFieldBackgroundImage()
{
 JFrame frame=new JFrame("Set JTextField background image");
 frame.add(this);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(300,65);
 frame.setLocationRelativeTo(null);
 frame.setResizable(false);
 frame.setVisible(true);
}

public void paint(Graphics g)
{
 setOpaque(false);

 //Image that will be set as JTextField background
 //I suggest, image that will be use is blur...
 //If image is locate at other location, you must put it's full location address.
 //For example : C:\\Documents and Settings\\evergreen\\Desktop\\textFieldBackgroundImage.jpg
 ImageIcon ii=new ImageIcon("textFieldBackgroundImage.jpg");
 Image i=ii.getImage();
 g.drawImage(i,0,0,this);
 super.paint(g);
}

public static void main(String[]args)
{
 SetJTextFieldBackgroundImage sjtfbi=new SetJTextFieldBackgroundImage();
}
}

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textFieldBackgroundImage.jpg

Set JButton background color on click

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Determine character is whitespace

Complete source code below will show you, how to determine character is whitespace or not in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsSpace.java
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public class DetermineCharacterIsSpace
{
public static void main(String[]args)
{
 //Create a space character using char by press spacebar once between single quote(' ')
 //You can try change it's value by change it to a letter 'A' for example.
 char a=' ';

 //Determine created character is space or not
 //using method isWhitespace from class Character.
 //isWhitespace is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isWhitespace(a))
 {
  //Print (It is a whitespace) if character is a whitespace
  System.out.println("It is a whitespace");
 }
 else
 {
  //Print (It is not a whitespace) if character is not a whitespace
  System.out.println("It is not a whitespace");
 }
}
}

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Determine character is uppercase

Complete source code below will show you, how to determine character is uppercase or not in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsUppercase.java
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public class DetermineCharacterIsUppercase
{
public static void main(String[]args)
{
 //Create a uppercase character using char with value(B)
 //You can try change it's value to letter(b)
 char a='B';

 //Determine created character is uppercase or not
 //using method isUpperCase from class Character.
 //isUpperCase is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isUpperCase(a))
 {
  //Print (It is an uppercase) if character is an uppercase
  System.out.println("It is an uppercase");
 }
 else
 {
  //Print (It is not an uppercase) if character is not an uppercase
  System.out.println("It is not an uppercase");
 }
}
}

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Determine character is lowercase

Complete source code below will show you, how to determine character is lowercase or not in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsLowercase.java
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public class DetermineCharacterIsLowercase
{
public static void main(String[]args)
{
 //Create a lowercase character using char with value(b)
 //You can try change it's value to letter(B)
 char a='b';

 //Determine created character is lowercase or not
 //using method isLowerCase from class Character.
 //isLowerCase is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isLowerCase(a))
 {
  //Print (It is a lowercase) if character is a lowercase
  System.out.println("It is a lowercase");
 }
 else
 {
  //Print (It is not a lowercase) if character is not a lowercase
  System.out.println("It is not a lowercase");
 }
}
}

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Determine character is letter or digit

Complete source code below will show you, how to determine character is letter or digit in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsLetterOrDigit.java
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public class DetermineCharacterIsLetterOrDigit
{
public static void main(String[]args)
{
 //Create a character using char with value(3)
 //You can try change it's value to letter(k)
 char a='3';

 //Determine created character is letter or digit
 //using method isLetterOrDigit from class Character.
 //isLetterOrDigit is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isLetterOrDigit(a))
 {
  //Print (It is a letter or a digit) if character is a letter or digit
  System.out.println("It is a letter or a digit");
 }
 else
 {
  //Print (It is not a letter or digit) if character is not a letter or digit
  System.out.println("It is not a letter or digit");
 }
}
}

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Determine character is letter or not

Complete source code below will show you, how to determine character is letter or not in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsLetter.java
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public class DetermineCharacterIsLetter
{
public static void main(String[]args)
{
 //Create a character using char with value(m)
 char a='m';

 //Determine created character is letter or not
 //using method isLetter from class Character.
 //isLetter is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isLetter(a))
 {
  //Print (It is a letter) if character is a letter
  System.out.println("It is a letter");
 }
 else
 {
  //Print (It is not a letter) if character is not a letter
  System.out.println("It is not a letter");
 }
}
}

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Determine character is digit or not

Complete source code below will show you, how to determine character is digit or not in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsDigit.java
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public class DetermineCharacterIsDigit
{
public static void main(String[]args)
{
 //Create a character using char with value(4)
 char a='4';

 //Determine created character is digit or not
 //using method isDigit from class Character.
 //isDigit is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isDigit(a))
 {
  //Print (It is a digit) if character is a digit
  System.out.println("It is a digit");
 }
 else
 {
  //Print (It is not a digit) if character is not a digit
  System.out.println("It is not a digit");
 }
}
}

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Set JButton gradient color

Complete source code below will show you, how to change JButton default gradient color.



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COMPLETE SOURCE CODE FOR : SetJButtonGradientColor.java
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import java.util.LinkedList;

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.UIManager;

import javax.swing.plaf.ColorUIResource;

public class SetJButtonGradientColor
{
public static void main(String[]args)
{
//Create UIManager object
UIManager manager=new UIManager();


//IMPORTANT : Key to know : "Button.gradient"

//Set color base on RGB
//You can get RGB value for your color at "Color picker" at above

//******************************************************
//Create linked list that will store all gradient information
//You can try to understand it by change it's value
LinkedList<Object> a=new LinkedList<Object>();
a.add(0.3);
a.add(0.3);

//First colour : R=2,G=208,B=206
a.add(new ColorUIResource(2,208,206));

//Second colour : R=136,G=255,B=254
a.add(new ColorUIResource(136,255,254));

//Third colour : R=0,G=142,B=140
a.add(new ColorUIResource(0,142,140));
//******************************************************

//Set Button.gradient key with new value
manager.put("Button.gradient",a);

//Create a button using JButton with text ( BUTTON )
JButton button=new JButton("BUTTON");

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

//Add created button into JFrame
frame.add(button);

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

//Set JFrame size
frame.setSize(330,80);

//Make JFrame visible. So we can see it.
frame.setVisible(true);
}
}

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Set JTextArea background image

Complete source code below will show you, how to set image background in a JTextArea. You can download image (textAreaBackground.jpg) that use in source code at below.

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COMPLETE SOURCE CODE FOR : AddImageBackgroundInJTextArea.java
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/**
*AddImageBackgroundInJTextArea will extends JTextArea class.
*So it also inherit all method from JTextArea
*It mean, we can use it directly.For example, setOpaque(false)..
**/
import javax.swing.*;

import java.awt.*;

public class AddImageBackgroundInJTextArea extends JTextArea
{
public AddImageBackgroundInJTextArea()
{
 //Create a window using JFrame with title ( Add image background in JTextArea )
 JFrame frame=new JFrame("Add image background in JTextArea");

 //Add JTextArea into JFrame
 frame.add(this);

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

 //Set JFrame size
 frame.setSize(500,500);

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

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

//Override JTextArea paint method
//It enable us to paint JTextArea background image
public void paint(Graphics g)
{
 //Make JTextArea transparent
 setOpaque(false);

 //Make JTextArea line wrap
 setLineWrap(true);

 //Make JTextArea word wrap
 setWrapStyleWord(true);

 //Get image that we use as JTextArea background
 ImageIcon ii=new ImageIcon("textAreaBackground.jpg");
 Image i=ii.getImage();

 //Draw JTextArea background image
 g.drawImage(i,0,0,null,this);

 //Call super.paint. If we don't do this...We can't see JTextArea
 super.paint(g);
}

public static void main(String[]args)
{
 AddImageBackgroundInJTextArea aibijta=new AddImageBackgroundInJTextArea();
}
}

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textAreaBackground.jpg