The eight basic data types of Java are: byte (bit), short (short integer), int (integer), long (long integer), float (single precision), double (double precision) , char (character), boolean (Boolean value).
About Java’s 8 basic data types, their names, digits, default values, value ranges and examples are shown in the following table:
Serial number |
##Data type |
Number of digits |
Default value |
Value range |
Examples |
byte(bit) | 8 | 0 | -2^7 - 2^7-1 | byte b = 10; | |
short(short integer) | 16 | ##0 | -2^ 15 - 2^15-1 | ##short s = 10; | ##3 |
int(integer) | ##320 | -2^ 31 - 2^31-1 | int i = 10; | 4 | |
64 | ##0 | -2 ^63 - 2^63-1 | long l = 10l; | 5 | |
32 | ##0.0 | - 2^31 - 2^31-1 | ##float f = 10.0f; | 6 | double(double) |
64 | 0.0 | -2^63 - 2^63-1 | double d = 10.0d; | ||
##7 | char (character) | 16 | empty | ##0 - 2^16-1char c = 'c'; | |
boolean(Boolean value) | 8 | false | ##true, false | boolean b = true; |
##In order to verify the contents of the form, run the verification code in eclipse as follows :
package com.ce.test; class Test { static byte b; static short s; static int i; static long l; static float f; static double d; static char c; static boolean bo; public static void main(String[] args) { System.out.println("byte的大小:"+Byte.SIZE +";默认值:"+b +";数据范围:"+Byte.MIN_VALUE+" - "+Byte.MAX_VALUE); System.out.println("short的大小:"+Short.SIZE +";默认值:"+s +";数据范围:"+Short.MIN_VALUE+" - "+Short.MAX_VALUE); System.out.println("int的大小:"+Integer.SIZE +";默认值:"+i +";数据范围:"+Integer.MIN_VALUE+" - "+Integer.MAX_VALUE); System.out.println("long的大小:"+Long.SIZE +";默认值:"+l +";数据范围:"+Long.MIN_VALUE+" - "+Long.MAX_VALUE); System.out.println("float的大小:"+Float.SIZE +";默认值:"+f +";数据范围:"+Float.MIN_VALUE+" - "+Float.MAX_VALUE); System.out.println("double的大小:"+Double.SIZE +";默认值:"+d +";数据范围:"+Double.MIN_VALUE+" - "+Double.MAX_VALUE); System.out.println("char的大小:"+Character.SIZE +";默认值:"+c +";数据范围:"+Character.MIN_VALUE+" - "+Character.MAX_VALUE); System.out.println("boolean的大小:"+Byte.SIZE +";默认值:"+bo +";数据范围:"+Byte.MIN_VALUE+" - "+Byte.MAX_VALUE); } }The output result on the console is as shown below:
The char type in Java is represented by two bytes, that is, sixteen bits. Because it is an unsigned number, it is 2 to the 16th power, and the value range is: 0 - 2^16-1;
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