Spring Hibernate Set Background Color in JLabel - Swing

Here is a sample tutorial to set background for a JLabel. By default, calling the setBackground(Color color) will not do the thing.

import javax.swing.*;
import java.awt.*;
class JLabelBackgroundDemo extends JFrame
{
JLabel l1,l2;
public JLabelBackgroundDemo()
{
setTitle("JLabel Background Demo");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(400,400);
setLayout(new FlowLayout());
setVisible(true);
// Create labels
l1=new JLabel("I am first label");
l2=new JLabel("I am second label");
// Make opaque
l1.setOpaque(true);
l2.setOpaque(true);
// Then, set background
l1.setBackground(Color.cyan);
l2.setBackground(Color.pink);
// Add labels
add(l1);
add(l2);
}
public static void main(String args[])
{
new JLabelBackgroundDemo();
}
}

Notes: By default, the JLabel is not opaque, so you will have to make it opaque first in order to set a background for it.

Spring Hibernate Setting Background Image in JFrame - Swing

Here is sample tutorial, a simple trick that enables you to set background image for JFrame.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class BackgroundImageJFrame extends JFrame
{
JButton b1;
JLabel l1;
public BackgroundImageJFrame()
{
setTitle("Background Color for JFrame");
setSize(400,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
/*
One way
-----------------
setLayout(new BorderLayout());
JLabel background=new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png"));
add(background);
background.setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
background.add(l1);
background.add(b1);
*/
// Another way
setLayout(new BorderLayout());
setContentPane(new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png")));
setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
add(l1);
add(b1);
// Just for refresh :) Not optional!
setSize(399,399);
setSize(400,400);
}
public static void main(String args[])
{
new BackgroundImageJFrame();
}
}

 Notes: 

The first way: Here i have taken a JLabel named background and an image icon to it and then set the layout of the frame as BorderLayout so that it appears whole window.And then, i have added the label background to the frame. Next, some components are added to the label background instead of the frame and the layout for the background label is set as FlowLayout so that the components come side by side from the starting of the frame.

The second way: Here i used the setContentPane(Container c) method, which means to set the container (the one that contains the components) to the frame. As JLabel being one of the sub-classes of the Container, i have used it, added an image icon to it. You could also note, the BorderLayout which is set in order to make the image spread on the whole frame Next, as usual i have changed the layout for the frame and then added components to it.

The Refresh: This is essential because, the background image will not visible when the frame is opened. So, we will need to refresh it. So, i have called the setSize(int w,int h) twice which resizes (i.e. refreshes) the frame so that the background image will be visible.

Spring Hibernate Set Background Color in JFrame - Swing

Here is a sample tutorial for setting the background color for a JFrame. By default, as in the AWT, a call to the setBackground(Color) method won't do the thing. Here is how-to achieve this.

Background Color for JFrame

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class BackgroundColorJFrame extends JFrame
{
public BackgroundColorJFrame()
{
setTitle("Background Color for JFrame");
setSize(400,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
// Get the container and set the background
getContentPane().setBackground(Color.lightGray);
}
public static void main(String args[])
{
new BackgroundColorJFrame();
}
}

Spring Hibernate Using JButton - Minimize/Maximize/Close JFrame

You can use a JButton to perform the actions on the JFrame. This is also a tutorial for JButton with ActionListener.

Use JButton to Maximize/Minimize/Close JFrame

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class JButtonWindowActions extends JFrame
{
JButton button1,button2,button3;
public JButtonWindowActions()
{
setTitle("JButtonWindowActions Demo");
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
setOpacity(0.7f);
button1=new JButton("Maximize/Restore");
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
{
if(getExtendedState()==NORMAL)
setExtendedState(MAXIMIZED_BOTH);
else
setExtendedState(NORMAL);
}
});
button2=new JButton("Minimize");
button2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
{
setState(ICONIFIED);
}
});
button3=new JButton("Close");
button3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
{
dispose();
}
});
// add buttons to frame
add(button1);
add(button2);
add(button3);
// pack the frame
pack();
}
public static void main(String args[])
{
new JButtonWindowActions();
}
}

setOpacity(0.7f): To just set the Opacity of the frame. It is optional.
NORMAL: Set the frame to the normal state i.e. it's original state.
MAXIMIZED_BOTH: Make the frame maximized i.e. spread it to the full screen.
ICONIFIED: Make the frame be at the task bar.
dispose(): Dispose the frame.

Spring Hibernate Create JProgressBar using Timer class in Swing

Here is a sample and easy tutorial to make a JProgressBar do its work i.e. keep loading. The javax.swing.Timer class allows you to do so.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class JProgressBarTimer extends JFrame
{
JProgressBar jp;
Timer t;
int i=0;
public JProgressBarTimer()
{
try
{
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
}catch(Exception e){}
setTitle("JProgressBar Timer Demo");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new GridBagLayout());
setLocationRelativeTo(null);
setVisible(true);
// Create a progress bar
jp=new JProgressBar();
// Paint the percent complete on progress bar
jp.setStringPainted(true);
// Set a size (optional)
jp.setPreferredSize(new Dimension(500,30));
// Start at 0
jp.setMinimum(0);
// End at 1000
jp.setMaximum(1000);
// Create a timer that executes for every 2 millisec
t=new Timer(2,new ActionListener(){
public void actionPerformed(ActionEvent ae)
{
if(i==1000)
i=0;
jp.setValue(i++);
}
});
// Start the timer
t.start();
add(jp);
pack();
}
public static void main(String args[])
{
new JProgressBarTimer();
}
}

NimbusLookAndFeel: I used the NimbusLookAndFeel because it is my choice personally. Alternatively, you can just leave that if you don't want to switch from the default MetalLookAndFeel.

Spring Hibernate Create Shaped Transparent JFrames in Java Swing

Here is a sample tutorial making fun with JFrame, giving it all the shapes that you can to a frame. Make a frame look circular, ellipse, curve, rounded rectanble, some other different shape that cannot be defined and may not be seen. Here i will show how you can customize your JFrame as you wish.

Circular Shape

Cubic Curve Shape

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
class ShapedJFrame extends JFrame
{
JButton b1;
public ShapedJFrame()
{
setTitle("Transparent JFrame Demo");
setLayout(new GridBagLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setUndecorated(true);
setVisible(true);
setOpacity(0.4f);

// Try different shapes

// Normal rounded rectangle
//setShape(new RoundRectangle2D.Double(0,0,getWidth(),getHeight(),20,40));

//Ellipse shape
//setShape(new Ellipse2D.Double(0,0,400,400));

// Quad Curve
//setShape(new QuadCurve2D.Double(0,0,400,50,400,400));

// Cubic Curve. Looks funny:)
//setShape(new CubicCurve2D.Double(0,0,500,5,200,0,500,500));

// For three-fourth circle
//setShape(new Arc2D.Double(new Rectangle2D.Double(0,0,500,500),90,270,Arc2D.PIE));

// For round circle shape
setShape(new Arc2D.Double(new Rectangle2D.Double(0,0,500,500),90,360,Arc2D.PIE));

b1=new JButton("I am a button!");
add(b1);

setSize(500,500);
setLocationRelativeTo(null);
}
public static void main(String args[])
{
new ShapedJFrame();
}
}

Round Rectangle:  Mostly found. A Rectangle with rounded corners. Double is a static class in the RoundRectangle2D class located in the java.awt.geom package.

new RoundRectangle2D.Double(double x, double y, double width, double height,double cornerwidth,double cornerheight)

QuadCurve.Double(double x1,double y1,double ctrlx,double ctrly,double x2,double y2):  Another shape.

CubicCurve2D.Double(double x1,double y1, double ctrlx1,double ctrly1,double ctrlx2,double ctrly2,double x2,double y2): The cubic curve shape. Define it yourself seeing what shape you get :)

Arc2D.Double(Rectangle2D rd,double start,double end, int type): Rectangle2D is an abstract class therefore, we use Rectangle2D.Double class which is static inner class. In this we specify, the x,y coordinates and width and height. Next the type of the arc. Possible types are Arc2D.CHORD, Arc2D.PIE, Arc2D.OPEN.

Spring Hibernate How-To: Create a Transparent JFrame in Java Swing

Here is a sample tutorial, can be a swing hack to optimize your JFrame to give it a better look through transparency.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class TransparentJFrame extends JFrame
{
JButton b1;
public TransparentJFrame()
{
setTitle("Transparent JFrame Demo");
setSize(400,400);
setLayout(new GridBagLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
//For Java 1.7 or above
setOpacity(0.4f);
//For lower java versions
//com.sun.awt.AWTUtilities.setWindowOpacity(this,0.4f);
b1=new JButton("I am a button!");
add(b1);
}
public static void main(String args[])
{
new TransparentJFrame();
}
}

GridBagLayout: To make the JButton come to center. You can use your own layout depending upon your wish.

Spring Hibernate Using Nimbus Look And Feel in JButton (Swing)

Here is how the JButton looks in the new Nimbus Look And Feel of Java 7. The following example works only in Java 7 or may be higher versions but not on Java 6 and lower.

 

import javax.swing.*;
import java.awt.*;
class NimbusButtonDemo extends JFrame
{
JButton b1,b2;
    public NimbusButtonDemo()
    {

    // set the nimbus look and feel
    try
    {
    UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
    }catch(Exception e){}


    setTitle("Nimbus Button Demonstration Swing");
    setLayout(new FlowLayout());
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);

   
    // Create buttons
    b1=new JButton("I am first Nimbus button!");
    b2=new JButton("I am second Nimbus button!");
   
    // add buttons to the frame
    add(b1);
    add(b2);
       
    // pack the frame
    pack();
    }
    public static void main(String args[])
    {
    new NimbusButtonDemo();
    }
}

UIManager: Present in the javax.swing package. Capable of performing look and feel related operations.

setLookAndFeel: An overloaded method that takes the class name or the Look And Feel object and the sets the corresponding look to the components. It throws ClassNotFoundException, InstantiationException, IllegalAccessException

Spring Hibernate Creating Menu Like Buttons in Swing

Buttons acting like menus in Java. It's just like what you have seen in Windows 7 and in most software. It is like Menus without a MenuBar. It is dead simple.

import javax.swing.*;
import java.awt.*;
class MenuButton extends JFrame
{
JMenuBar menuBar;
JMenu menu;
JMenuItem newFile,open,save,saveas,exit;

    public MenuButton()   
    {
    setTitle("Menu Button");
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(new FlowLayout());
   
    // Set a background for menubutton to have a visible look
    getContentPane().setBackground(Color.darkGray);

    menuBar=new JMenuBar();
    menuBar.setBorderPainted(false);
   
    menu=new JMenu("File");

    // It's my style!
    menu.setBorderPainted(false);

    newFile=new JMenuItem("New");
    open=new JMenuItem("Open");
    save=new JMenuItem("Save");
    saveas=new JMenuItem("Save As");
    exit=new JMenuItem("Exit");

    menu.add(newFile);
    menu.add(open);
    menu.add(save);
    menu.add(saveas);
    menu.add(exit);
   
    // Add menu to menubar
    menuBar.add(menu);

    // Add(don't set) menubar to frame
    add(menuBar);

    // Make frame maximized for a good look
        //setExtendedState(MAXIMIZED_BOTH);

    // or pack
    pack();   
    }
    public static void main(String args[])
    {
    new MenuButton();
    }

}

javax.swing.*: Contains JFrame, JMenuBar, JMenu, JMenuItem.
java.awt.*: Contains the layout classes. FlowLayout here.
borderPainted(): Make the border painted false. It is your wish!

Spring Hibernate Add and Remove Elements in JList Dynamically

Till now we've seen how to work with JLists, store jlist selected items using serialization also on how it looks on NimbusLookAndFeel and now it's time to look at how to dynamically add contents to JList and delete them.

Shall we go? OK. Let's go!

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
class DynamicJList extends JFrame
{
JMenuBar mbar;
JMenu menu;
JTextField jf;
JButton jb;
JList<String> jl;
Vector<String> v;
public DynamicJList()
{
// Set frame properties
setTitle("Dynamic JList");
setSize(400,400);
setLayout(new FlowLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);

// Create a vector that can store String objects
v=new Vector<String>();

// Create a JList that is capable of storing String type items
jl=new JList<String>(v);

// Make it fat.
jl.setPreferredSize(new Dimension(200,200));

// Add key listener to JList jl
jl.addKeyListener(new KeyAdapter(){

// What to do when a key is pressed?
public void keyPressed(KeyEvent ke)
{

// If user presses Delete key,
if(ke.getKeyCode()==KeyEvent.VK_DELETE)
{

// Remove the selected item
v.remove(jl.getSelectedValue());

// Now set the updated vector (updated items)
jl.setListData(v);

}
}
});

// Create a new MenuBar
mbar=new JMenuBar();

// Create a menu with text Menu
menu=new JMenu("Menu");

// Create a JButton with text Add
jb=new JButton("Add");

// Add actionlistener to JButton jb
jb.addActionListener(new ActionListener(){

// When user does an action?
public void actionPerformed(ActionEvent ae)
{

// Add what the user types in JTextField jf, to the vector
v.add(jf.getText());

// Now set the updated vector to JList jl
jl.setListData(v);

// Make the button disabled
jb.setEnabled(false);

}

});

jf=new JTextField(20);

// Add key listener to JTextField
jf.addKeyListener(new KeyAdapter(){

// What to do when a key is pressed?
public void keyPressed(KeyEvent ke)
{
// Make the JButton enabled
jb.setEnabled(true);

// When user presses enter key, then..
if(ke.getKeyCode()==KeyEvent.VK_ENTER)
// Click on JButton, doClick() does it!
jb.doClick();

}
});

// Add JTextField jf to JMenu menu
menu.add(jf);

// Add JButton jb to JMenu menu
menu.add(jb);

// Add JMenu menu to JMenuBar mbar
mbar.add(menu);

// Add MenuBar to frame. Don't set.
add(mbar);

// Create a scrollpane for JList jl
JScrollPane js=new JScrollPane(jl);

// Add that scrollpane to JFrame. You don't need to add JList again, as you add scrollpane, it means that you are adding JList because JScrollPane is pointing JList only!
add(js);

}

public static void main(String args[])
{
new DynamicJList();
}

}

That's it. Everything is explained within the program and all that is in this paragraph for you has a link to other  swing components. Take a look.

Watch it. Before you leave!

Spring Hibernate Create Swing Buttons using JButton

Here is a tutorial illustrating javax.swing.JButton class in Java used to create buttons.

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class JButtonDemo extends JFrame
{
JButton button1,button2;
    public JButtonDemo()
    {
    setTitle("JButton Demo - I am the default title!");
    setSize(400,400);
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(new FlowLayout());

    button1=new JButton("Click me!");
    button1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ae)
            {
            setTitle("You clicked me!");
            getContentPane().setBackground(Color.red);
            }
        });
    button2=new JButton("Click me too!");
    button2.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ae)
            {
            setTitle("You clicked me too!");
            getContentPane().setBackground(Color.blue);
            }
        });
    add(button1);
    add(button2);
    }
    public static void main(String args[])
    {
    new JButtonDemo();
    }

}

getContentPane(): By default, we cannot apply background to a JFrame so we use this method to get the container of the JFrame and paint the background on it.
ActionListener(){}: An anonymous inner class is written for ease because only we've got two buttons.
javax.swing.*: Import everything from swing package, including JFrame, JButton
java.awt.event.*: Everything to handle the events. Here ActionListener and ActionEvent
java.awt.*: For Color and FlowLayout class here.

-----------------------------------
Output
-----------------------------------

Spring Framework Set Hand Cursor for JButton

An example on setting hand cursor for JButton in Java.

Example

import javax.swing.*;

import java.awt.*;

class HandCursorButton

{

	public static void main(String args[])

	{

		JFrame f=new JFrame();

		f.setTitle("Hand Cursor for JButton");

		f.setSize(400,400);

		f.setLayout(new FlowLayout());

		f.setVisible(true);

		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		

		JButton b=new JButton("Click me!");

		b.setCursor(new Cursor(Cursor.HAND_CURSOR));

		f.add(b);

	}

}

Output

Hand Cursor for JButton

Spring Framework Set Background Image to JMenuBar

This illustrates setting background image to JMenuBar. For this we need to paint an background image on JMenuBar. 1 main step is far from background image.

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class MenuBarBackground extends JFrame

{

JMenuBar mbar;

JMenu menu;

 public MenuBarBackground()

 {

 setTitle("MenuBar Background");

 setDefaultCloseOperation(EXIT_ON_CLOSE);

 setVisible(true);

 

 mbar=new JMenuBar(){

  public void paintComponent(Graphics g)

  {

  g.drawImage(Toolkit.getDefaultToolkit().getImage("F:/Wallpapers/violetpink.png"),0,0,this);

  }

 };

 

 menu=new JMenu("Menu");

 menu.setForeground(Color.white);

  for(int i=1;i<=5;i++)

  menu.add(new JMenuItem("MenuItem "+i));

 

 mbar.add(menu);

 setJMenuBar(mbar);

 setSize(400,400);

 }

 public static void main(String args[])

 {

 new MenuBarBackground();

 }

}

Output

Look at menubar background image

paintComponent(Graphics g): Takes java.awt.Graphics as parameter. This contains drawImage() method which takes java.awt.Image object, x,y axes and ImageObserver object. paint() is not used here because, if we use this, i could not see the Menu.

g.drawImage(Toolkit.getDefaultToolkit().getImage("F:/Wallpapers/violetpink.png"),0,0,this): Method of java.awt.Graphics class. java.awt.Toolkit is a class containing a static method getDefaultToolkit() which returns the object of that class only (java.awt.Toolkit). This class contains getImage() method which takes the path of the image file and returns the java.awt.Image object. My background image is located in F:\Wallpapers. You can notice / instead of \ this is because / is equal to \\ in Windows and similar operating systems. Next, 0,0 are the x,y co ordinates respectively. Try changing them, you'll notice the change. this represents current object which acts as ImageObserver.

In this way, we can set background image to JMenuBar easily in single step.

Spring Framework Set Selection Background, Foreground for JMenu

The following illustrates setting selection background, foreground for JMenu in java swing. This is simple and involves 2 lines of important code. Here we go.

import javax.swing.*;

import java.awt.*;

class SelectionBackgroundJMenu extends JFrame

{

JMenuBar mbar;

JMenu menu;

JMenuItem m1,m2,m3,m4;



	public SelectionBackgroundJMenu()

	{



	UIManager.put("Menu.selectionBackground",new Color(245,29,29));

	UIManager.put("Menu.selectionForeground",Color.white);



	setTitle("Colored Menu");

	setDefaultCloseOperation(EXIT_ON_CLOSE);

	setVisible(true);

	

	mbar=new JMenuBar();

	menu=new JMenu("Menu");



		for(int i=1;i<=5;i++)

		menu.add(new JMenuItem("Menu Item "+i));



	mbar.add(menu);

	setJMenuBar(mbar);



	setSize(400,400);

	setLocationRelativeTo(null);

	}



	public static void main(String args[])

	{

	new SelectionBackgroundJMenu();

	}

}

Output

Also see Setting selection background, foreground for JMenuItem

The respective properties are useful for setting selection backgrounds for JMenu. The first word (before .) indicates the component (Menu here), after that the property. Note that not all components have this property.

UIManager.put("Menu.selectionBackground",new Color(245,29,29)): This sets the selection background with the given color.
UIManager.put("Menu.selectionForeground",Color.white): This sets the selection foreground with given color (white).

Spring Hibernate Random Progress Speed for JProgressBar

Random Progress in JProgressBar

Here is a sample tutorial, to randomize JProgressBar progress speed.

Randomize Progress - Example

import javax.swing.*;
import java.awt.*;
import java.util.*;
class RandomProgressbar extends JFrame implements Runnable
{
JProgressBar jb;
Thread t;
Random r;

public RandomProgressbar()
{
setTitle("Random Progress in ProgressBar");
setLayout(new GridBagLayout());
setSize(400,400);
setLocationRelativeTo(null);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);

jb=new JProgressBar();
jb.setStringPainted(true);

r=new Random();

t=new Thread(this);
t.start();
add(jb);
}
public static void main(String args[])
{
new RandomProgressbar();
}
public void run()
{
try
{
for(int i=1;i<=jb.getMaximum();i++)
{
jb.setValue(i);

int rnum=r.nextInt(100);

Thread.sleep(rnum);

// Print random number
System.out.println("Generated number : "+rnum);

// Loop forever

if(i==jb.getMaximum())
i=1;
}
}catch(Exception e){}

}

}

javax.swing.*: JFrame, JProgressBar used.

java.awt.*: GridBagLayout used.

java.util.*: Random class used.

jb.setStringPainted(true): Let the percent complete be visible.

t.start(): Start thread execution. Run is invoked.

jb.getMaximum(): Returns maximum value. Default: 100

jb.setValue(i): Update JProgressBar value to i (declared in loop).

r.nextInt(100): Returns random number from 0 to 100

Thread.sleep(rnum): Set random sleep time, for random speed.

Runnable interface: Contains run() method.

Spring Framework Set Selection Background, Foreground for JMenuItem

The following example illustrates setting selection background, foreground for JMenuItem in java swing. This is simple and involves 2 lines of important code. Here we go.

import javax.swing.*;

import java.awt.*;

class SelectionBackgroundJMenuItem extends JFrame

{

JMenuBar mbar;

JMenu menu;

JMenuItem m1,m2,m3,m4;



	public SelectionBackgroundJMenuItem()

	{



	UIManager.put("MenuItem.selectionBackground",new Color(245,29,29));

	UIManager.put("MenuItem.selectionForeground",Color.white);



	setTitle("Colored Menu Item");

	setDefaultCloseOperation(EXIT_ON_CLOSE);

	setVisible(true);

	

	mbar=new JMenuBar();

	menu=new JMenu("Menu");



		for(int i=1;i<=5;i++)

		menu.add(new JMenuItem("Menu Item "+i));



	mbar.add(menu);

	setJMenuBar(mbar);



	setSize(400,400);

	setLocationRelativeTo(null);

	}



	public static void main(String args[])

	{

	new SelectionBackgroundJMenuItem();

	}

}

Output

Output Window

The respective properties are useful for setting backgrounds for MenuItem. The first word (before .) indicates the component (MenuItem here), after that the property. Note that not all components have this property.

UIManager.put("MenuItem.selectionBackground",new Color(245,29,29)): This sets the selection background with the given color.

UIManager.put("MenuItem.selectionForeground",Color.white): This sets the selection foreground with given color (white).

Spring Hibernate Using JTextArea in Java Swing

JTextArea

Component that stores data of multiple rows. Part of javax.swing package.

Class Structure

public class JTextArea extends javax.swing.JTextComponent

Constructors

  public JTextArea();

  public JTextArea(String text);

  public JTextArea(int rows, int columns);

  public JTextArea(String text, int rows, int columns);

  public JTextArea(Document documentobj);

  public JTextArea(Document documentobj, String text, int rows, int columns);

Methods

  public void setTabSize(int size);
  public int getTabSize();

  public void setLineWrap(boolean flag);
  public boolean getLineWrap();

  public void setWrapStyleWord(boolean flag);
  public boolean getWrapStyleWord();

  public void insert(String text, int pos);

  public void append(String text);

  public void replaceRange(String text, int start, int end);

  public int getRows();
  public void setRows(int);

  public int getColumns();
  public void setColumns(int cols);


  public void setFont(Font font);

Example

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

class JTextAreaJava extends JFrame
{
JTextArea jt1,jt2,jt3,jt4;
JScrollPane js1,js2,js3,js4;
public JTextAreaJava()
{
setTitle("Java JTextArea");
setLayout(new GridLayout());
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);

jt1=new JTextArea();

/* Methods */
jt1.setText("First TextArea");
jt1.setFont(new Font("Times New Roman",Font.PLAIN,22));
jt1.append("Appended Text.");
jt1.setTabSize(20);
jt1.setRows(100);
jt1.setColumns(100);
jt1.setLineWrap(true);
jt1.setWrapStyleWord(false);
jt1.insert(" Inserted in middle. ",10);

js1=new JScrollPane(jt1);
add(js1);


jt2=new JTextArea("Second TextArea");
jt2.setFont(new Font("Times New Roman",Font.PLAIN,22));
jt2.append(" Appended Text Second TextArea ");
jt2.setLineWrap(true);
jt2.setWrapStyleWord(true);

js2=new JScrollPane(jt2);
add(js2);

jt3=new JTextArea(100,50);
jt3.setText("Third TextArea");
jt3.setFont(new Font("Times New Roman",Font.PLAIN,22));

js3=new JScrollPane(jt3);
add(js3);

jt4=new JTextArea("Fourth TextArea",100,50);
jt4.setFont(new Font("Times New Roman",Font.PLAIN,22));
jt4.replaceRange("Forth", 0,6);

js4=new JScrollPane(jt4);
add(js4);
setExtendedState(MAXIMIZED_BOTH);
}

public static void main(String args[])
{
new JTextAreaJava();
}
}

jt1.setText("First TextArea") : Set "First TextArea" in jt1.

jt1.setFont(new Font("Times New Roman"),Font.PLAIN,22): Set font for the textarea jt1. The font, Times New Roman, style: PLAIN, size: 22.

jt1.append("Appended Text."): This text will be appended at last to jt1.

jt1.setLineWrap(true): Enable linewrap, i.e. if the text reaches end of line, then remaining text gets in new line.

jt1.setWrapStyleWord(false): Set word style to false, so that if a word reaches the end and is not completed, the whole word doesn't come in the new line. You can understand it if you are familiar with WordWrap in Notepad.

jt1.insert(" Insert in middle. ",10): Insert text at the specified position, here 10

jt4.replaceRange("Forth",0,6): Replace text with Forth with the text between 0 and 6.

Spring Hibernate JComboBox - See this example to know what's inside the box?

What is JComboBox?

Nothing, it is just son of Choice in the AWT. Son doesn't mean that it is the sub class of Choice, instead i just mean that it does the same thing as the Choice in the AWT does. It allows only one item to choose. Mostly used to check Male/Female, Date of Birth (Day-Month-Year) etc.

The Example

import javax.swing.*;
import java.awt.*;
class JComboBoxExample extends JFrame
{
JComboBox jc1,jc2;
public JComboBoxExample()
{

setTitle("I am JComboBox Example!");
setSize(400,400);
setLayout(new FlowLayout());
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);

jc1=new JComboBox();

// Add items
jc1.addItem("Google");
jc1.addItem("Yahoo!");
jc1.addItem("Bing");
jc1.addItem("iGo4iT Search");

// Set 4th item selected
jc1.setSelectedIndex(3);

// Add jc1 to JFrame
add(jc1);

jc2=new JComboBox();

// Add items
jc2.addItem("Amazon.com");
jc2.addItem("eBay");
jc2.addItem("Walmart");
jc2.addItem("Best Buy");

// Make it editable
jc2.setEditable(true);

// Add jc to JFrame
add(jc2);

}

public static void main(String args[])
{
new JComboBoxExample();
}
}

Explanation

jc1,jc2: Both are the objects for the JComboBox.

addItem(""): Method of the JComboBox used to add items to it. The parameter to it is usually java.lang.Object, as per the requirement i have used String as it is a sub class of java.lang.Object class.

jc1.setSelectedIndex(3): As we know, index usually start from 0. Setting the selected index as 3 means that select the 4th item (0 1 2 3). Therefore, iGo4iT Search is selected.

jc2.setEditable(true): You might have observed, some drop downs can be edited i.e. the user is allowed to type something in it usually in autocomplete. It is obvious now i hope so, that the by passing true to the method lets the user type something in the JComboBox.

Spring Framework Add Custom Components to JFileChooser

Let me show you how to add custom components to JFileChooser in Swing. This is very easy and even you have a method for that. In this post, i will be showing you how to use that method to use your own components and enjoy! Here we go!

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class CustomJFileChooser extends JFrame

{

private JButton jb;

private JFileChooser jf;

private JPanel jp;

private JLabel jl;



 public CustomJFileChooser()

 {

 createAndShowGUI();

 }

 

 private void createAndShowGUI()

 {

 

 // Set frame properties

 setTitle("Custom JFileChooser");

 setSize(400,400);

 setLayout(new FlowLayout());

 setLocationRelativeTo(null);

 setDefaultCloseOperation(EXIT_ON_CLOSE);

 setVisible(true);

 

 // Create JButton

 jb=new JButton("Open JFileChooser");

 

 // Add ActionListener to JButton

 jb.addActionListener(new ActionListener(){

  public void actionPerformed(ActionEvent ae)

  {

  // Create JFileChooser

  jf=new JFileChooser();



  // Create JPanel

  jp=new JPanel();

 

  // Create JLabel

  jl=new JLabel("I am a label on custom JFileChooser");

 

  // Add JLabel to the JPanel

  jp.add(jl); 



  // This is that method, do it before showOpenDialog!

  jf.setAccessory(jp);

  

  // Show Open Dialog

  jf.showOpenDialog(null);

   }

 });

 

 // Add JButton to the JFrame

 add(jb);

 }

 

 public static void main(String args[])

 {

 new CustomJFileChooser();

 }

}

Output of the CustomJFileChooser

Custom JFileChooser Screenshot

This is not a hack, it is just a feature provided. This is the way you can add your own custom components to JFileChooser. You don't actually need the JPanel, I just added it, you can directly add JLabel to it. But in order to have a layout of the components we added i added JPanel. Good to know if we can add components in a certain layout to the JFileChooser without JPanel and without disturbing the layout of the JFileChooser's by-birth components.

Spring Framework Center JDialog on Screen & JFrame in Java Swing

An example on keeping JDialog on the center of the screen and on the center of JFrame in Java.

Example

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class CenterJDialog extends JFrame
{

JButton jb;
JDialog jd;
JFrame thisFrame;

public CenterJDialog()
{

// Set frame properties
setTitle("Center a JDialog");
setSize(400,400);
setLayout(new FlowLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);

// Set value of thisFrame to current object
thisFrame=this;

// Create a JButton
jb=new JButton("Click me to open JDialog :)");

// Add JButton to the JFrame
add(jb);

// Add action listener for jb
jb.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent ae)
{
// Set dialog properties
jd=new JDialog(thisFrame);
jd.setTitle("I am a JDialog");
jd.setLayout(new FlowLayout());

// Add sample components
jd.add(new JTextField(20));
jd.add(new JButton("Button"));

jd.setVisible(true);
jd.pack();

// Set location centered for JFrame
jd.setLocationRelativeTo(thisFrame);

// Set location centered for screen
//jd.setLocationRelativeTo(null);

}
});

}

public static void main(String args[])
{

new CenterJDialog();

}

}

Output

Center JDialog for JFrame [here] for screen [src]

Also see my post on Creating Transparent JFrame in Java Swing