Basic type-java

** Basic type ** byte<<short<<int<<long<< float<<double ← Small box Large box →

・ Integer can be assigned to double type ・ Int type and double type operations → double type Reason: The double type is larger Movement to fit larger molds

・ Integer int -2147483648 ～ 2147483647 int i = 100; no decimal point ・ Integer long -9223372036854775808 ～ 9223372036854775807 long lo = 300000L; Add L at the end without decimal point -Integer short -32768 to 32767 ・ Integer byte -128 to 127

Integers are usually used as int type, and I don't understand the significance of byte and short. ** But I have problems with Oracle **

· Boolean boolean boolean Boolean, true or false boolean Win = false; ・ Character type char Unicode character \ u0000 ～ \ uFFFF char A ='A';

sample

            char uni =  ‘¤’; //OK
            char uni2 = U+00A4; //NG Unicode can't be inserted
            char uni3 = ‘U+00A4’; //NG　''It is useless even if it is surrounded by

・ Floating point type float Single precision floating point number With a decimal point, F or f float fo = 30.5f; ・ Floating point type double double precision floating point number double do = 30.5;

You can get the maximum and minimum values with