Java Variables and Data Types Explained | Beginners, Exams, Viva & Interviews
Learn Java Variables and Data Types from zero in simple language. This beginner-friendly Java tutorial explains variables, primitive data types, non-primitive data types and practical Java examples step by step.
In this complete tutorial, you will learn how Java stores different types of data, how to declare and initialize variables, and how to select the correct data type while writing a Java program.
✅ TOPICS COVERED
• What is a variable in Java?
• Why do we need variables?
• Variable declaration and initialization
• Java variable naming rules
• Declaration vs initialization vs assignment
• Primitive and non-primitive data types
• The 8 primitive data types in Java
• byte, short, int and long
• float and double
• char and boolean
• String, arrays, classes and objects
• Primitive vs reference data types
• Local, instance and static variables
• Default values of Java variables
• Range and size of primitive data types
• How to choose the correct data type
• Practical Java programs and examples
• Common beginner mistakes
• Exam, viva and interview questions
💻 SIMPLE JAVA EXAMPLE
int age = 20;
double price = 99.50;
char grade = 'A';
boolean passed = true;
String name = "Riya";
In this example:
• age stores a whole number
• price stores a decimal number
• grade stores one character
• passed stores true or false
• name stores text
🎯 THIS VIDEO IS USEFUL FOR
• Absolute beginners learning Java
• B.Tech, BCA, MCA, Diploma and CSE students
• School and college examinations
• Java practical examinations
• Viva preparation
• Placement preparation
• Java fresher interviews
• Anyone learning programming from zero
By the end of this video, you will understand what variables and data types are, how they work in Java and how to explain them confidently in an exam, viva or interview.
Watch the complete video, practise every example and write the programs yourself. This will help you remember the concepts for a long time.
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