Basic data types in JAVA

byte: The smallest data type in java. 1 byte/8 bits. -128 (2^7)~127 (2^7-1), default value 0.

short: Short integer, 2 bytes/16 bits, value range -32768 (--2^15)~32767 (2^15-1), default value 0

int: Integer type, 4 bytes/32 bits, value range -2147483648 (-2^31) ~ 2147483647 (2^31-1), default value 0

long: Long integer type, 8 words Section/64 bits, -2^63 (-2^63)~2^63-1 (2^63-1), default value 0L

float: Floating point type, 4 bytes/32 bits , used to store numbers with decimal points (the difference from double is that the float type has only 6 to 7 valid decimal digits), default value 0

double: Double precision floating point type, 8 bytes/64 bits, default Value 0

char: Character type, single character, 2 bytes/16 bits, 0 ('\u0000') ~ 65535 ('\uffff'), default value is empty

boolean: Boolean type, 1 byte, judge true or false (only two values, true, false), default value false

Small capacity --------------- ----------------> Large capacity

byte,short,char << int << long << float << double

byte << short

byte and char, short and char will not have implicit conversion, only forced type conversion can be performed between each other.

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