Thinking in java (2)----primitive types
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The variable holds the value directly and the object is stored in the stack, so the primitive type variable is more efficient than the obecjt by using new.
boolean --- true/false Boolean
char 2byte 0--2^16-1 Character
byte 1byte -2^8 2^8-1 Byte
short 2byte -2^15 2^15-1 Short
int 4byte -2^31 2^31-1 Integer
long 8byte -2^63 2^63-1 Long
float 4byte IEEE754 IEEE754 Float
double 8byte IEEE754 IEEE754 Double
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