ashcoll / test2

1.3 types

[ and ] means inclusive, ( and ) means exclusive;

1. primitive type
   1. numeric type
      1. integral type
         • byte (8 bits signed two's-complement, [-128, 127] / [-2^7, 2^7 - 1], default value 0);
         • short (16 bits signed two's-complement, [-32768, 32767] / [-2^15, 2^15 - 1], default value 0);
         • int (32 bits signed two's-complement, [-2147483648, 2147483647] / [-2^31, 2^31 - 1], default value 0);
         • long (64 bits signed two's-complement, [-9223372036854775808, 9223372036854775807] / [-2^63, 2^63 - 1], default value 0);
         • char (16 bits unsigned represents unicode BMP's code points, utf-16 encoding, [0, 65535], default value \u0000/null);
      2. floating point type
         • float (32bits, IEEE 754 standard, default value +0);
         • double (64bits, IEEE 754 standard, default value +0);
   2. boolean type
2. reference type
3. null type: no name, can not direct declare; we can simply treat null as a special literal;
   1. strictly speak, null is not reference type;