Java Data Types

Variables in Java must be objects, arrays, or one of the primitive data types

Java has 8 primitive data types
(boolean, byte, short, int, long, double, float, char)

Notes:

• All integer types are signed (and there is no unsigned keyword)

• Unlike C and C++ char variables are 16 rather than 8 bits
  Because Java is Unicode compliant

• Unlike C, Java types have a definitely fixed size
  in C, it used to depend on the compiler

• Primitive data types are passed to method by value
  the actual value of a primitive type can only be modified by the methods of the declaring or derived object

boolean likeeScience = true;
	/*	boolean likewise have values {true, false}
		they can never be mixed up with integer or other type
	 */
byte teeth = 32;		// bytes go from -128 to 127
if (!likeeScience) teeth = teeth - 1;
float pi = 3.141592f; 	// you need the "f" here
short classes = 0xbad;	// hexadecimal
   

eScience