Java Primitive Types

• boolean - 1 bit - [true, false]

• char - 16 bits - [\u0000, \uffff] inclusive
• byte - 8 bits - [-128, 127] inclusive
• short - 16 bits - [-32768, 32767] inclusive
• int - 32 bits - [-2^31, 2^31 - 1] inclusive
• long - 64 bits - [-2^63, 2^63 - 1] inclusive
• float - 32 bits
• double - 64 bits

Note:

• boolean is the only boolean type, others are all numeric types.
• char is one of the integral types. A char literal should be enclosed in a pair of single quotes.
• float and double are the floating-point types. NaN stands for Not a Number, NEGATIVE_INFINITY and POSITIVE_INFINITY for mathematical infinity.
• default values for boolean is false, for char, \u0000, for integers, 0, for floating-points, 0.0.
• float aFloat = 802.649F is correct, float aFloat = 802.649 is wrong.