How to know when a component resized

We use button as component in this example.

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COMPLETE SOURCE CODE FOR : HowToKnowWhenComponentResize.java
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import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

import java.awt.event.ComponentListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import java.awt.Component;

public class HowToKnowWhenComponentResize
{
 JFrame b=new JFrame("TRY RESIZE ME");
 
 JButton d=new JButton("MONSTER");
 
 public HowToKnowWhenComponentResize()
 {
  ComponentListener cl=new ComponentAdapter()
  {
   public void componentResized(ComponentEvent evt)
   {
    Component temp=(Component)evt.getSource();
    int currentWidth=temp.getSize().width;
    int currentHeight=temp.getSize().height;
    JOptionPane.showMessageDialog(null,"SIZE OF COMPONENT IS CHANGE\nMONSTER WIDTH NOW : "+currentWidth+"\nMONSTER HEIGHT NOW : "+currentHeight,"MONSTER'S SIZE",JOptionPane.INFORMATION_MESSAGE);
   }
  };
  
  d.addComponentListener(cl);
  b.add(d);
  
  b.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  b.setSize(400,100);
  b.setVisible(true);
 }
 
 public static void main(String[]args)
 {
  HowToKnowWhenComponentResize myObject=new HowToKnowWhenComponentResize();
 }
}

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How to know current location of jframe after it moved to other location on screen

Result of the current location for a jframe in this program is current coordinate of the top left corner for the jframe.

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

import javax.swing.JFrame;
import javax.swing.JOptionPane;

import java.awt.event.ComponentListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import java.awt.Point;
import java.awt.Component;

public class HowToKnowCurrentLocationOfJframe extends ComponentAdapter
{
 JFrame b=new JFrame("TRY MOVE ME");
 
 public HowToKnowCurrentLocationOfJframe()
 {
  b.addComponentListener(this);
  
  b.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  b.setSize(400,100);
  b.setVisible(true);
 }
 
 public void componentMoved(ComponentEvent evt)
 {
  Component temp=(Component)evt.getSource();
  JOptionPane.showMessageDialog(null,"CURRENT LOCATION : "+" X = "+(temp.getLocationOnScreen()).getX()+" Y = "+(temp.getLocationOnScreen()).getY(),"CURRENT LOCATION",JOptionPane.INFORMATION_MESSAGE);
 }
 
 public static void main(String[]args)
 {
  HowToKnowCurrentLocationOfJframe myObject=new HowToKnowCurrentLocationOfJframe();
 }
}

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How to know when a component has been made invisible or visible ???

In this example, we use button as component.

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

import java.awt.event.ComponentListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import java.awt.FlowLayout;

public class HowToKnowWhenComponentVisible
{
 JFrame a=new JFrame("CLICK HERE");
 JFrame b=new JFrame("FRAME TO STORE JBUTTON NAME'S MONSTER");
 
 JButton c=new JButton("VISIBLE");
 JButton e=new JButton("INVISIBLE");
 JButton d=new JButton("MONSTER");
 
 public HowToKnowWhenComponentVisible()
 {
  ComponentListener cl=new ComponentAdapter()
  {
   public void componentHidden(ComponentEvent evt)
   {
    JOptionPane.showMessageDialog(null,"MONSTER IS INVISIBLE");
   }
   
   public void componentShown(ComponentEvent evt)
   {
    JOptionPane.showMessageDialog(null,"MONSTER IS VISIBLE");
   }
  };
  
  d.addComponentListener(cl);
  b.add(d);
  
  ActionListener al=new ActionListener()
  {
   public void actionPerformed(ActionEvent evt)
   {
    if(evt.getSource()==e)
    {
     d.show(false);
     b.repaint();
    }
    
    if(evt.getSource()==c)
    {
     d.show(true);
     b.repaint();
    }
   }
  };
  
  c.addActionListener(al);
  e.addActionListener(al);
  a.setLayout(new FlowLayout());
  a.add(c);
  a.add(e);
  
  a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  a.setSize(400,100);
  a.setVisible(true);
  
  b.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
  b.setSize(400,100);
  b.setLocation(400,400);
  b.setVisible(true);
 }
 
 public static void main(String[]args)
 {
  HowToKnowWhenComponentVisible myObject=new HowToKnowWhenComponentVisible();
 }
}

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How to determine when a JFrame opened or closed

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

import javax.swing.JFrame;
import java.awt.Frame;
import javax.swing.JButton;
import javax.swing.JOptionPane;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


public class DetermineWhenAJframeIsOpenOrClose
{
  JFrame frame;

  JFrame a=new JFrame("OPEN A JFRAME WITH TITLE'S MONSTER");
  JButton b=new JButton("CLICK HERE TO OPEN");
  
  public DetermineWhenAJframeIsOpenOrClose()
  {
   
  b.addActionListener(new ActionListener()
  {
   public void actionPerformed(ActionEvent evt)
   {
    frame=new JFrame("MONSTER");
    frame.setSize(300,500);
    frame.setVisible(true);
    
    frame.addWindowListener(new WindowAdapter()
    {
     //windowOpened METHOD WILL BE CALLED WHEN A JFRAME IS OPENED
     public void windowOpened(WindowEvent evt)
     {
      JOptionPane.showMessageDialog(null,"MONSTER IS OPEN");
     }
   
     //windowClosing METHOD WILL BE CALLED WHEN A JFRAME IS CLOSING
     public void windowClosing(WindowEvent evt)
     {
      Frame temp=(Frame)evt.getSource();
      temp.dispose();
      JOptionPane.showMessageDialog(null,"MONSTER IS CLOSE");
     }
   
    });
   
   }
  });
  
  a.add(b);
  
  a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  a.setSize(500,100);
  a.setVisible(true);
  
  }
 
 public static void main(String[]args)
 {
  DetermineWhenAJframeIsOpenOrClose mainObject=new DetermineWhenAJframeIsOpenOrClose();
 }
}

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Close application when click on JFrame close button

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

import javax.swing.JFrame;

public class ExitApplicationUsingJFrameCloseButton
{
 public static void main(String[]args)
 {
  JFrame a=new JFrame("EXIT AN APPLICATION USING JFRAME CLOSE BUTTON");
  
  //JFrame.EXIT_ON_CLOSE will make your application close when you hit JFrame close button
  a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  a.setSize(200,200);
  a.setVisible(true);
 }
}

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JFrame hide when click close button

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

import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class HidingJFrameWithoutDestroy
{
 public static void main(String[]args)
 {
  JFrame a=new JFrame("HIDE A JFRAME");
  
  a.addWindowListener(new WindowAdapter()
  {
   public void windowClosing(WindowEvent evt)
   {
    try
    {
    JFrame temp=(JFrame)evt.getSource();
    temp.setVisible(false);
    String a=JOptionPane.showInputDialog(null,"CHOOSE ONE : \n 1-Make It Visible \n 2-Exit");
    int b=Integer.parseInt(a);
    
    if(b==1)
    {
     temp.show(true);
    }
    
    else if(b==2)
    {
     System.exit(0);
    }
    
    else
    {
     JOptionPane.showMessageDialog(null,"YOU PUT WRONG NUMBER");
    }
    }
    catch(Exception exception)
    {
     JOptionPane.showMessageDialog(null,"ERROR, DON'T DO THAT\nTHIS PROGRAM WILL CLOSE");
     System.exit(0);
    }
   }
   
   public void windowActivated(WindowEvent event)
   {
    JFrame temp=(JFrame)event.getSource();
    temp.setVisible(true);
   }
  }
  );
  
  a.setSize(200,200);
  a.setVisible(true);
 }
}

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Set jframe size and it's location when click on maximize button

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COMPLETE SOURCE CODE FOR : SettingBound.java
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/**
 *THIS TUTORIAL WILL SHOW YOU HOW TO SET THE MAXIMUM SIZE OF YOUR FRAME 
 *AND IT'S LOCATION WHEN YOU CLICK
 *MAXIMIZE BUTTON BESIDE JFRAME CLOSE BUTTON
 **/
 
import java.awt.Rectangle;
import javax.swing.JFrame;

public class SettingBound
{
 public static void main(String[]args)
 {
  //first value, 400=x coordinate on your screen
  //second value, 400=y coordinate on your screen
  //third value, 800=JFrame width
  //fourth value, 200=JFrame height
  Rectangle rec=new Rectangle(400,400,800,200);
  
  JFrame frame1=new JFrame("Setting Bound");
  
  frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame1.setMaximizedBounds(rec);//set maximize setting for your JFrame
  frame1.setVisible(true);
 }
}

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Remove JFrame title bar

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

import javax.swing.JFrame;

public class RemovingTitleBar
{
 public static void main(String[]args)
 {
  JFrame a=new JFrame("REMOVING TITLE BAR");
  a.setUndecorated(true);
  a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  a.setSize(200,200);
  a.setVisible(true);
 }
}

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