Java Basic data types

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/**java is divided into 4 classes of 8 basic data Types 4 classes: 1. Integral type (Byte,short,int,long) 2. Floating-point type (float,double) 3. Character type (char) 4.         Boolean (Boolean) */public class basedatatype{public static void Main (string[] args) {//integer byte, short, int, long       BYTE A1=1;      Byte occupies 1 bytes = 8 bits -2^7~2^7-1 ( -128~127) short a2=10;     Short accounts for 2 bytes = 16 bits -2^15~2^15-1 int a3=100;    int accounts for 4 bytes = 32 bits -2^31~2^31-1 long a4=1000;        Long takes 8 bytes = 64 bits -2^63~2^63-1 System.out.println (A1);        SYSTEM.OUT.PRINTLN (A2);        SYSTEM.OUT.PRINTLN (A3);        System.out.println (A4);    */* Note: 1. Integer assignment if beyond the storage range compile error loss accuracy *//float float, double double b1=10.1;   Double takes 8 bytes = 64 bit float b2=12.2f;        Float accounts for 4 bytes = 32-bit float b3= (float) 13.3;        System.out.println (B1);        System.out.println (B2);        SYSTEM.OUT.PRINTLN (B3); /* Note: 1. Float data default is double type, if you want to assign to float type must be forced type conversion, for floating-point number of forced type conversion twoOne way is: directly in the back plus F one is: in front plus (float) *//char char is a single character enclosed in single quotation marks char c1= ' a ';        Char takes 2 bytes = 16 bits char c2= ' 1 ';        Char c3= ' good ';        SYSTEM.OUT.PRINTLN (C1);        System.out.println (C2);        System.out.println (C3); /* Note: 1. In the computed storage, the numbers and letters accounted for 1 bytes, while the kanji accounted for 2 bytes, Java in order to solve this problem, so defined char accounted for 2 bytes to uniformly store letters and Kanji 2.    The difference between char and string is that strings are multiple characters enclosed in double quotes *///Boolean Boolean Boolean d1=true;        Boolean 1 bytes = 8-bit Boolean d2=false;        System.out.println (D1);        System.out.println (D2); /* Note: 1. A Boolean type of true cannot be equal to 1, false also not equal to 0, this and C language to distinguish */}}/* Review Summary: 1. Divide the basic data type variable by the data type that belongs to: 8 basic data types (Byte,short,int, Long,float,double,boolean,char) Reference data type variables: variables except for 8 basic data types are reference variable 2. String is not part of the base data type of the reference data type */

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Java Basic data types