Chapter 2 - Java for Beginners Course

Assignment Operator

The simple assignment operator, represented by an equals (=) sign in Java, indicates that the variable on the left will take the value that we provide on the right hand side of the = operator.

We’ve already seen some examples of this operator in previous sections as it is one of the most common operators.

To provide some further examples:

int cores = 4;
int memoryInGB = 256;
boolean externalGraphicsCard = true;

Compound Assignments

When you want to update the value of a variable as a result of an arithmetic operation, you can mix the arithmetic operator with the assignment operator for simplicity. These are called compound assignments and are represented by: +=, -=, etc.

This means that the following 2 statements are equivalent to the statement in the respective code comment:

int value = 1;

// equivalent to: value = value + 1;
value += 1;

// equivalent to: value = value * 2;
value *= 2;

System.out.println("New value is: " + value);

Output:

New value is: 4
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Contents
Welcome to the Course!
Course Introduction
Chapter 1 - Building Blocks
Quick introduction to Java Variables Classes And Objects Class Example - Defining a class Object Examples - Creating instances Java Application Example - Running our first app Accessing class members - The dot operator Packages - Organizing the code
Chapter 2 - Primitives and Operators
Primitives Arithmetic Operators Assignment Operator Unary Operators Equality and Relational Operators Conditional Operators
Chapter 3 - Statements and Control Flow
Expressions Statements If-Then Statement If-Then-Else Statement More If Statements Switch Statement While and Do-While Statements For Statement Branching Statements Exception Handling
Chapter 4 - Code Example
Example Project - A Simple Vending Machine Adding money Delivering Items Giving Change
Chapter 5 - Classes and Interfaces
Introduction Access Level Modifiers Class Declaration - Class, Methods and Fields Class Declaration - Constructors Inheritance Basics Inheritance - Constructors Inheritance - Methods and Fields Polymorphism Abstract Classes and Methods Interfaces Static Class Members Class Composition Final Classes and Class Members Generic Classes
Chapter 6 - Base Object Behaviors
Introduction Type Comparison Type Casting Object Equality - The Contract Object Equality - Common Pitfalls Object String Representation Garbage Collection Object Comparison Primitive Wrappers and Autoboxing
Chapter 7 - Data Structures
Introduction Arrays - Declaration and Creation Arrays - Basic Operations Core Collection Interfaces List and ArrayList - Basic Operations ArrayList Internals Introduction to Hash Tables Map and HashMap - Basic Operations Set and HashSet - Basic Operations
Chapter 8 - Anonymous classes and lambdas
Introduction Filtering a List Anonymous Classes Lambdas Built-in Functional Interfaces
Chapter 9 - Streams
Introduction Creating Streams Intermediate Operations Terminal Operations