#How many bytes does char occupy in Java?
A char in java takes up 2 bytes. Java uses Unicode, 2 bytes to represent a character. A number, English or Chinese character is a character, but when it comes to numbers and English, the first byte of the two bytes stored is 0, which is a waste of space. Storing Chinese characters takes up 2 bytes.
1: "Byte" is byte, "bit" is bit;
2: 1 byte = 8 bit;
The example code is as follows:
public class Test { public static void main(String[] args) { String str = "中"; char x = '中'; byte[] bytes = null; byte[] bytes1 = null; try { bytes = str.getBytes("utf-8"); bytes1 = charToByte(x); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("bytes 大小：" + bytes.length); System.out.println("bytes1大小：" + bytes1.length); } public static byte[] charToByte(char c) { byte[] b = new byte[2]; b[0] = (byte)((c & 0xFF00) >> 8); b[1] = (byte)(c & 0xFF); return b; } }
Run results:
bytes 大小：3 bytes1大小：2
java uses unicode to represent characters. The unicode of the Chinese character "中" is 2 bytes.
String.getBytes(encoding) method is to obtain the byte array representation of the specified encoding.
Usually gbk/gb2312 is 2 bytes and utf-8 is 3 bytes.
If encoding is not specified, the system default encoding will be used.
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