java data type and the code table, the escape character

	type name	Byte space	range
Integer	byte	1	-2 ^{. 7} to 2 ^{. 7} -1 to 127 or -128
	short	2	-2 ¹⁵ to 2 ¹⁵ -1
	int	4	-2 ^{31 is} to 2 ^{31 is} -1
	long	8	-2 ^{63 is} to 2 ^{63 is} -1
Float	float	4	Single precision, less precision fractional part of
	double	8	Double precision fractional part is large and the operation value
character	char	2	0-65535 as a sign bit less so than twice as large as int
Boolean	boolean	1	True true false false

float and double have a problem in terms of our most decimal conversion binary bits are infinite, the lack of accuracy. In the latter would solve api java

Then you can use the following test

package com.tedu.basic;


//测试取值范围
public class Test1_Scope {
	public static void main(String[] args) {
		byte bmax = Byte.MAX_VALUE;
		byte bmin = Byte.MIN_VALUE;
		
		//打印变量的值快捷键alt+/
		System.out.println(bmax);//127
		System.out.println(bmin);//-128
		
		short smax = Short.MAX_VALUE;
		short smin = Short.MIN_VALUE;
		System.out.println(smax);//32767
		System.out.println(smin);//-32768
		
		//int  Integer
		int imax = Integer.MAX_VALUE;
		int imin = Integer.MIN_VALUE;
		System.out.println(imax);//2147483647
		System.out.println(imin);//-2147483648
		
		//long Long
		long lmax = Long.MAX_VALUE;
		long lmin = Long.MIN_VALUE;
		System.out.println(lmax);//9223372036854775807
		System.out.println(lmin);//9223372036854775808
		
		//float   Float
		float fmax = Float.MAX_VALUE;
		float fmin = Float.MIN_VALUE;
		System.out.println(fmax);//3.4028235E38
		System.out.println(fmin);//1.4E-45 
		
		//double  Double
		double dmax = Double.MAX_VALUE;
		double dmin = Double.MIN_VALUE;
		System.out.println(dmax);//1.7976931348623157E308
		System.out.println(dmin);//4.9E-324
		
		System.out.println();
		
		
		char  c = 'h';//""  字符串  ''字符
		char c2 = '0';
		char c3 = '我';//char可以存一个汉字
		char c4 = 200;
		// character type, the final output is a character
		98 // able to convert into character b, 
		// char type because the underlying code table will be checked ascii
		// ascii code table defines the character corresponding to 0-127, 
		// ascii code numbers are by no table? Character to deal with 
		System.out.println (c4); //? 
	} 
	
}

Encoding - the digit character conversion process is the conversion rule - code table

ASCLL (Astor code table) 0-127 although it occupies half a byte or a byte

ISO8859-1 (Western European code table) one byte 0-255

GB2312 (English), BIG5 (Traditional) 2 bytes

GBK (GB code) // State's own coding

UnIcode coding system which has a lot code table (Unicode) are specific (utf-8, utf-16, utf-32, etc.)

Escape character:

\ T space \ r carriage return \ n line feed, etc.

java data type and the code table, the escape character

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