04 data types & variables
- 1. Data Types & VariablesDhrubojyotiKayal
- 2. What are data types?Data types in JavaVariablesLiteralsAgenda
- 3. classification identifying one of various types of dataThey have special features and requirementsPerform operations on dataThey need memoryWhat are data types?
- 4. 8 primitive data types, all signed (+,-)Irrespective of environment the data types have same sizeData types in Java
- 5. Variables/Fields stores values with specific data typeInstance variables (object fields)Class variables (static fields)Local variables (method fields)Parameters (arguments passed to a method)int age;long creditCardNumber; Terminate with semi-colon or separate with commaint age, long creditCardNumber;Variables
- 6. Variable names are case-sensitiveUnlimited length with letters and digitsBegin with letter, ‘$’,’_’Don’t use ‘$’ or ‘_’Whitespace not allowedSubsequent characters may be letters, digits, dollar signs, or underscore charactersUse meaningful namesUse Camelian NotationintcreditCardNumber;Variable naming
- 7. Fixed values assigned to variables without computationint age = 32;long creditCardNumber = 135353553566;Literals
- 8. Write a simple Java program and declare 3 variables – your age (integer), your credit card number(long), and your bank balance(double)Assign literal values to these fieldsPrint the 3 values in consoleExercise
- 9. Q&A