The difference between char and byte

A lot of beginners (including me, have been learning Java for more than a year) Ken will be on the char and byte two data types have doubts, confusion, today specially looked at a lot of data, the byte and char two types are summarized and compared, first to share the results with you:

Byte is a byte data type, is a signed type, occupies 1 bytes, and has a size range of-128-127. Char is a character data type, is unsigned, occupies 2 bytes (Unicode code), the size range is 0-65535; char is a 16-bit binary Unicode character, and Java uses Char to represent a character.

Here are some examples to compare the differences:

1. Char is unsigned, can represent an integer, cannot represent a negative number, and byte is a signed type, which can represent 128-127;

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2. char C = (char)-3;//char does not recognize negative numbers, must be cast otherwise error, even after casting, does not recognize
4. System.out.println (c);
6. byte d1 = 1;
8. byte d2 =-1;
10. byte d3 = 127;//If it is byte d3 = 128; error
12. byte d4 =-128;//If it is byte d4 =-129; Error
14. System.out.println (D1);
16. System.out.println (D2);
18. SYSTEM.OUT.PRINTLN (D3);
20. System.out.println (D4);

The result is:

?
1
-1
127
-128

2, char can be a table Chinese characters, byte can not, such as:

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1. Char e1 = ' Medium ', e2 = ' country ';
2. byte f= (Byte) ' in ';//must be cast otherwise error
3. SYSTEM.OUT.PRINTLN (E1);
4. SYSTEM.OUT.PRINTLN (E2);
5. System.out.println (f);

The result is:

In
Country
45

3, char, byte, int for English characters, can be converted to each other, such as:

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1. byte g = ' B '; b corresponds to ASCII is 98
2. Char h = (char) g;
3. char i = 85; U corresponds to ASCII is
4. int j = ' H '; H corresponds to ASCII is 104
5. System.out.println (g);
6. System.out.println (h);
7. System.out.println (i);
8. System.out.println (j);

The result is:
98
B
U
104

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The difference between char and byte