Java Programming: Constants, Variables, and Data Types, Lecture notes of Java Programming

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CONSTANTS,

VARIABLES

AND

DATA TYPES

Constants

Constants do not change final datatype CONSTANTNAME = VALUE; final double PI = 3.14159; final int SIZE = 3;

Assignment Statements

x = 1; // Assign 1 to x; radius = 1.0; // Assign 1.0 to radius; a = 'A'; // Assign 'A' to a;

Data Types

Type Casting

Implicit casting double d = 3 ; (type widening) Explicit casting int i = (int) 3. 0 ; (type narrowing) int i = (int)3.9; (Fraction part is truncated)