SCJP Lecture on Language Fundamentals

Introduction

• Focus on Language Fundamentals
• Keep submitting assignments on Language Fundamentals

Key Concepts

1. Keywords

• Reserved words in Java
• Examples: int, boolean, class, etc.

2. Identifiers

• Names given to elements such as classes, methods, and variables
• Rules:
  • Must begin with a letter (A-Z, a-z), dollar sign $, or underscore _
  • Subsequent characters can be letters, digits, dollar signs, or underscores
  • Case-sensitive
  • Cannot use Java reserved words

3. Data Types

• Primitive Data Types: byte, short, int, long, float, double, char, boolean
• Non-Primitive Data Types: Objects, Arrays

4. Variables

• Containers that hold data
• Types of variables: local, instance, and static

5. Literals

• Fixed values assigned to variables
• Types: Integer, Floating-point, Character, String, Boolean

6. Arrays

• Collection of similar type elements
• Declaration: datatype[] arrayName;
• Instantiation: arrayName = new datatype[size];

Summary

• Understand and use keywords, identifiers, and data types.
• Properly declare and initialize variables and arrays.
• Submit assignments on time.