How many bytes does char occupy in Java?

#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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