Every Java programmer must read books

Every Java programmer must read and understand the following books.

1. Effective Java

2. Concurrency in practice

Effective Java:

This book is authored by Joshua Bloch. He took the major role in authoring the java.util package which is [collection framework] one of the java core libraries.

He explains the best practices that every programmer should consider while writing java programs.

Some of them are:

• Contract between hashcode() and equals() of Object class when programmer overrides one of these methods in their classes
• Exceptions
• concurrency: Inter thread communication, synchronization etc
• Immutable Objects

The above points are few among others.

Concurrency in practice:

This book gives complete explanation about how efficient concurrency is achieved in java programs using concurrency utility classes which were introduced in Java 5 version.

This book is authored by:

• Brian Goetz
• Tim peierls
• Joshua Bloch
• Joseph Bowbeer
• David Holmes and
• Doug Lea

You can get them from amazon in form of hard copy or soft copy or both. Get them soon. :)
  

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: