What is java char

What is java char?

Char is a reserved word in Java. Unlike other languages, char is 16-bit in Java because Java uses Unicode. However, the 8-bit ASCII code is included in Unicode and ranges from 0 to 127.

But English, Spanish, German, and French don’t need to be expressed this way at all, so it is actually more efficient for them to use ASCII codes. There is a trade-off issue here.

Because char is 16 bits and uses Unicode encoding, char has the following initialization method:

//字符，可以是汉字，因为是Unicode编码
char c = 'c'; 
//可以用整数赋值
char c = 十进制数，八进制数，十六进制数等等;
//用字符的编码值来初始化
char c = '\u数字';

About how many bytes char occupies

1. "Byte" is byte, "bit" is bit;

2.1 byte = 8 bit;

char is 2 bytes in Java. Java uses unicode, 2 bytes (16 bits) to represent a character.

char type assignment

char a = 'a';  //任意单个字符，加单引号。
char a = '中';//任意单个中文字，加单引号。
char a = 111;//整数。0~65535。十进制、八进制、十六进制均可。输出字符编码表中对应的字符。

Note: char can only hold a single character.

Char operation

The char type can be operated on because char has corresponding values ​​in character encoding tables such as ASCII.

In Java, when running on char type characters, they are treated directly as integers corresponding to the ASCII table.

Example:

char m = 'a';
char m = 'a' + 'b';//char类型相加，提升为int类型，输出对应的字符。
int m = 'a' + 'b';//结果是195。//195没有超出int范围，直接输出195。
char m = 'a' + b;//会报错。//因为b是一个赋值的变量。
char m = 197;//输出字符编码表中对应的字符。
char m = '197';//会报错。//因为有单引号，表示是字符，只允许放单个字符。
char m = 'a' + 1;//输出结果是b。//提升为int，计算结果98对应的字符是b。

Summary

Use single quotation marks'' to identify, only a single character can be placed.

char char, char int - the types are promoted to int, and after appending the value to the char variable, the corresponding characters in the character encoding table are output.

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