Java Language Basics
Java is a simple, object-oriented programming language known for its readability and platform independence. Here’s a basic overview of Java syntax and some essential concepts to help you get started.
Java Output
Java uses the System.out.println()
method to print text to the console. It is commonly used for displaying output.
Java Comments
Comments in Java are used to explain code and are ignored by the compiler. There are three types: single-line, multi-line, and Javadoc comments.
Java Variables
Variables are used to store data. In Java, variables must be declared with a data type before use.
Java Data Types
Java has two categories of data types: primitive types (such as int, double, char, boolean) and reference types (such as objects and arrays).
Java Type Casting
Type casting is the process of converting a variable from one data type to another. There are two types: widening casting (automatic) and narrowing casting (manual).
Java Operators
Operators in Java perform operations on variables and values. Common types include arithmetic, comparison, and logical operators.
Java Strings
Strings represent text and are objects in Java. They are immutable, meaning their values cannot be changed after they are created.
Java Math
The Math
class provides methods for performing numeric operations, such as square root, power, and rounding.
Java Booleans
A boolean represents one of two values: true or false. It is commonly used for conditional logic.
Java If...Else
The if...else
statement is used for conditional logic, executing code blocks based on whether a condition is true or false.
Java Switch Statement
The switch
statement tests a variable for equality against a list of values, allowing different actions based on the value.
Java While Loop
The while
loop repeatedly executes a block of code as long as the given condition is true.
Java For Loop
The for
loop is used for executing a block of code a specific number of times.
Java Break and Continue
The break
statement is used to exit a loop prematurely, while the continue
statement skips the current iteration and moves to the next one.