Essential Java

“Essential Java” delves into the core concepts and practical applications of Java programming. The document covers fundamental Java syntax, object-oriented programming principles, data structures, and algorithms. It also explores advanced topics such as multithreading, networking, and GUI development. With a focus on enhancing Java proficiency, the content provides insights into best practices, design patterns, and optimization techniques. Whether you are a beginner looking to grasp the basics or an experienced developer aiming to deepen your Java skills, “Essential Java” serves as a comprehensive guide to mastering the language and leveraging its capabilities effectively.

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Insertion into ConcurrentHashMap

Essential Java

public class InsertIntoConcurrentHashMap { public static void main(String[] args) { ConcurrentHashMap<Integer, SomeObject concurrentHashMap = new ConcurrentHashMap<(); SomeObject value = new SomeObjec...

String literals

Essential Java

String literals provide the most convenient way to represent string values in Java source code. A String literal consists of: An opening double-quote ( " ) character. Zero or more other characters tha...

The Null literal

Essential Java

The Null literal (written as null ) represents the one and only value of the null type. Here are some examples MyClass object = null; MyClass[] objects = new MyClass[]{new MyClass(), null, new MyClass...

Character literals

Essential Java

Character literals provide the most convenient way to express char values in Java source code. A character literal consists of: An opening single-quote ( \' ) character. A representation of a characte...

Literals

Essential Java

Versions [{“Name”:“Java SE 1.0”,“GroupName”:null},{“Name”:“Java SE 1.1”,“GroupName”:null},{“Name”:“Java SE 1.2”,“GroupName”:null},{“Name”:“Java SE 1.3”,“GroupName”:null},{“Name”:“Java SE 1.4”,“GroupNa...

Decimal Integer literals

Essential Java

Integer literals provide values that can be used where you need a byte , short , int , long or char instance. (This example focuses on the simple decimal forms. Other examples explain how to literals ...

Boolean literals

Essential Java

Boolean literals are the simplest of the literals in the Java programming language. The two possible boolean values are represented by the literals true and false . These are case-sensitive. For examp...

Escape sequences in literals

Essential Java

String and character literals provide an escape mechanism that allows express character codes that would otherwise not be allowed in the literal. An escape sequence consists of a backslash character (...

Floating-point literals

Essential Java

Floating point literals provide values that can be used where you need a float or double instance. There are three kinds of floating point literal. Simple decimal forms Scaled decimal forms Hexadecima...

Using underscore to improve readability

Essential Java

Since Java 7 it has been possible to use one or more underscores (_) for separating groups of digits in a primitive number literal to improve their readability. For instance, these two declarations ar...

Minimal Applet

Essential Java

A very simple applet draws a rectangle and prints a string something on the screen. public class MyApplet extends JApplet{ private String str = "StackOverflow"; @Override public void init() { setBackg...

Loading images audio and other resources

Essential Java

Java applets are able to load different resources. But since they are running in the web browser of the client you need to make sure that these resources are accessible. Applets are not able to access...