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 Primitive data types are passed by value boolean like6837 = true; // boolean likewise have values {true, false} byte teeth = 32; // bytes go from -128 to 127 if (!like6837) teeth = teeth - 1; float pi = 3.141592f; // you need the "f" here short classes = 0xbad; // hexadecimal
	Lecture 2		Slide 8		6.837 Fall '98

All variables in Java must be declared as an object, an array, or a primitive data types.

Java has 8 primitive data types:

(boolean, byte, short, int, long, double, float, char)

• Primitive types are created by declaration if they are created at all
• Primitive types are passed to methods by value, their actual value of a primitive type can only be modified by the methods of the declaring or derived object
• Java is somewhat strongly typed (more so than either C or C++)