Detailed Java basic data types

1. BYTE, short, int, long:
   • BYTE takes 8 bits (bit) binary: 0000 0000 and 1111 1111, decimal: -128 < byte < 127
   • Short takes 2 bytes (byte), 16 bits (bit)
   • int is 4 bytes (byte), 32 bit (bit)
   • Long takes 8 bytes, 64 bits (bit)
2. float, double
   • Float takes 4 bytes, 32 bits
   • Double takes 8 bytes, 64 bits
3. Char
   • Char takes 2 bytes, 16 bits
4. Boolean
   • Boolean accounted for 1/8 bytes, 1 bits

calculation table for binary calculator1000 0000 = 1280100 0000 = 640010 0000 = 320001 0000 = 160000 1000 = 80000 0100 = 40000 0010 = 20000 0001 = 10000 0000 = 0
Binary speed algorithm:

• Take 195 binary?

Ideas:

1. 195 is greater than 128 so the highest position is 1:1XXX XXXX
2. 195-128 = 67 is greater than 64 so the highest second bit is calculated as 1:11XX XXXX
3. 67-64 = 3 is greater than 2 so the projection is: 1100 001X
4. 3-2 = 1 So the extrapolation is: 1100 0011 is the binary of 195

calculation between basic data types:

1. The computed result between Byte, short, char is int
2. int + Long = long
3. int + float = float
4. int + double = Double
5. Any type that is added to string is string

Detailed Java basic data types