Introduction to java
Java is a high-level, object-oriented, and platform-independent programming language developed by Sun Microsystems in 1995 (now owned by Oracle Corporation). It follows the "Write Once, Run Anywhere" (WORA) principle, meaning Java programs can run on any platform with a Java Virtual Machine (JVM).
Basic Structure of java
A Java program follows a structured format, which includes a class, methods, and statements. Below is
the fundamental structure of a Java program:Package Declaration (Optional)
Import Statements (Optional)
Class Definition
Main Method
Statements inside the Main Method.
Data Types in Java
In Java, data types specify the type of data that a variable can store. Java is a strongly typed language, meaning every variable must have a declared type.The datatypes of java are premitive and non-premitive data types.
Operators in Java
Operators in Java are symbols used to perform operations on variables and values. Java provides various types of operators for arithmetic, logical, relational, bitwise, and other operations.
Control Statements
Java provides control statements like if-else, switch-case, loops (for, while, do-while).
Functions in Java
Functions allow code reusability. They can be predefined or user-defined.
Pointers in Java
Pointers store memory addresses and enable dynamic memory allocation.
Arrays and Strings
Arrays store multiple elements of the same type, while strings are arrays of characters.
File Handling in Java
File handling in Java allows programs to create, read, write, and manipulate files. Java provides the java.io and java.nio packages for file operations.
Conclusion
Java is a powerful, object-oriented, platform-independent, and secure programming language widely used for web, mobile, and enterprise applications. With its robust libraries, memory management, and multi-threading capabilities, Java provides a strong foundation for developing scalable and efficient software.