Internals of JVM

Internals of Java Virtual Machine are explained very clearly in the below blog by James Blooms. 

Internals of JVM by James Blooms

Simple program which demonstrates Swing/AWT Grid layout

Simple program which demonstrates Swing/AWT Grid layout:

This post is intended to the beginners of swing/awt.

This below program creates a JFrame with 2 labels, 2 textfields and 2 buttons.

import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

/**
 * @author Nagasharath Kopalle
 *
 * Simple program to demontrate Gridlayout
 *
 */
public class GridLayoutDemo extends JFrame {

private JLabel labelName = null;

private JTextField textFieldName = null;

private JLabel labelPassword = null;

private JPasswordField passwordFieldPassword = null;

private JButton buttonSubmit = null;

private JButton buttonCancel = null;

/**
*
*/
public GridLayoutDemo() {
initComponents();
}

/**
* instantiates components and adds properties.
*/
void initComponents() {

this.setTitle("Grid Layout Demo");
this.setSize(300, 200);
GridLayout layout = new GridLayout(3, 2);
layout.setHgap(10);
layout.setVgap(5);
labelName = new JLabel("User Name: ");
textFieldName = new JTextField();

labelPassword = new JLabel("Password: ");
passwordFieldPassword = new JPasswordField();

buttonSubmit = new JButton("Submit");
buttonCancel = new JButton("Cancel");

this.setLayout(layout);
this.getContentPane().add(labelName);
this.getContentPane().add(textFieldName);

this.getContentPane().add(labelPassword);
this.getContentPane().add(passwordFieldPassword);

this.getContentPane().add(buttonSubmit);
this.getContentPane().add(buttonCancel);
}

public static void main(String[] args) {

GridLayoutDemo demo = new GridLayoutDemo();
demo.setVisible(true);
}
}

Output:

Eclipse Java Editor Shortcuts

Eclipse Oxygen Java editor Shortcuts helps in editing source code more comfortably. Frequently used default shortcuts are listed below. 

Description	Shortcut
Delete Line	CTRL + D
Copy Line	CTRL + ALT + Down Arrow
Add method level, class level, member level Comments	SHIFT + ALT + J
Format Java Source code	CTRL + SHIFT + F
Make line commented	CTRL + /
Make multiple lines [block] commented	CTRL + SHIFT + /
Search selected similar word within the source document	CTRL + K
Select line from beginning to end	SHIFT + End key
Select line from end to beginning	SHIFT + Home key
Select Word by word in same line	CTRL + SHIFT + Right Arrow
Move line above	ALT + Up Arrow
Move line below	ALT + Down Arrow

Shortcuts can be customized and new shortcuts can be created through Keys Page in Preferences wizard.

1.  Window menu > Go To Preferences 
2.  Type Keys as the "filter text"
3.  Please find the image below for reference.

Example:

Add new Shortcut for cut whole line command.

1.  In Keys page type filter text -- Cut line
2.  Type your convenient key. In my case I added SHIFT + X
3.  Finally, Click Apply and Click Apply and Close.
4.  That's it. Now Test your new Shortcut. 

Happy Coding :)