Remove component from JFrame during runtime

Source code below will show you, how to remove component from a JFrame during program runtime. Component that will be use in source code below is a group of JButton.

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

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Component;

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

public class RemoveComponentOnJFrameAtRuntime extends JFrame implements ActionListener
{
JPanel panel;

public RemoveComponentOnJFrameAtRuntime()
{
 super("Remove component on JFrame during runtime");
 setLayout(new BorderLayout());

 panel=new JPanel();
 panel.setLayout(new FlowLayout());

 JButton button1=new JButton("BUTTON 1");
 JButton button2=new JButton("BUTTON 2");
 JButton button3=new JButton("BUTTON 3");
 JButton button4=new JButton("BUTTON 4");
 JButton button5=new JButton("BUTTON 5");

 panel.add(button1);
 panel.add(button2);
 panel.add(button3);
 panel.add(button4);
 panel.add(button5);

 add(panel,BorderLayout.CENTER);

 JButton removeButton=new JButton("Click here to remove button");
 removeButton.addActionListener(this);

 add(removeButton,BorderLayout.SOUTH);

 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 setSize(500,500);
 setVisible(true);
}

public void actionPerformed(ActionEvent event)
{
 Component[]storeAllButtonInPanel=panel.getComponents();

 if(storeAllButtonInPanel.length!=0)
 {
  panel.remove(storeAllButtonInPanel.length-1);
  panel.revalidate();
  validate();
  repaint();
 }

 else
 {
  JOptionPane.showMessageDialog(this,"No button to remove");
 }
}

public static void main(String[]args)
{
 RemoveComponentOnJFrameAtRuntime rcojfat=new RemoveComponentOnJFrameAtRuntime();
}
}

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JUST COMPILE AND EXECUTE IT
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Remove JFrame title bar

Source code below will show you, how to remove title bar from a JFrame.

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

public class RemoveJFrameTitleBar
{
public static void main(String[]args)
{
 //Create a JFrame
 JFrame frame=new JFrame();

 //Method setUndecorated(true) will eliminate JFrame title bar
 frame.setUndecorated(true);

 //Set JFrame size to :
 //Width : 400 pixels
 //Height : 400 pixels
 frame.setSize(400,400);

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

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JUST COMPILE AND EXECUTE IT
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Remove element from array

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COMPLETE SOURCE CODE FOR : RemoveElementFromAnArray.java
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public class RemoveElementFromAnArray
{
public static void main(String[]args)
{
 //Now we want to remove last element,"crocodile"
 String[]animal={"lion","tiger","elephant","crocodile"};

 //Step 1:Create a temp array with sizeArrayAnimal-1
 String[]temp=new String[animal.length-1];

 //Step 2:Copy element from "lion" to "elephant" into array temp
 System.arraycopy(animal,0,temp,0,(animal.length-1));

 //Make animal array point to temp array
 animal=temp;

 //Print all element in animal
 int temp2=0;
 while(temp2!=animal.length)
 {
  System.out.println(animal[temp2]);
  temp2=temp2+1;
 }
}
}

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JUST COMPILE AND EXECUTE IT
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