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This article will explain in detail how to implement type conversion in Java, the quality of the article content is high, so Xiaobian shares it for everyone to make a reference, I hope you have a certain understanding of related knowledge after reading this article.

public class Change {

public static void main(String[] args) {

byte a = (byte)-1;

System.out.println(a);

char b =(char)a;

System.out.println(b);

int c = (int)b;

System.out.println(c);

}

}

Take a look at the output:

Here's an explanation of the problem:

Step 1: int type-1 strong to byte type or-1

The second part: byte type-1 converted to char, by ascii code table,-1 is not in the table range, because the default char accounts for 2 bytes, that is, 8 bits, the maximum value that can be stored is 65536, so the char number range is 0-65535, turn-1 into char, will look backwards, that is, the maximum value 65535,

Step 3:65535 of char type converted to int or 65535

ASCII code comparison table

basic data type byte size byte1 byte minimum is-128 (-2^7); maximum is 127 (2^7-1);boolean at least 1 byte This type is used only as a flag to record true/false conditions;short2 bytes minimum is-32768 (-2^15); maximum is 32767 (2^15 - 1);char2 bytes minimum is\u0000 (i.e. 0); maximum is\uffff (i.e. 65,535);int4 bytes minimum is-2,147,483,648 (-2^31); maximum is 2,147,483,647 (2^31 - 1);float4 byte single-precision floating-point number 32 bits long, mantissa length 23, exponent length 8, exponent offset 127;long8 bytes minimum is-9,223,372,036,854,775,808 (-2^63); maximum is 9,223,372,036,854,775,807 (2^63 -1); double4-byte double-precision floating point number 64 bits long, mantissa length 52, exponent length 11, exponent offset 1023;

English letters:

Number of bytes: 1; Code: GB2312

Number of bytes: 1; Code: GBK

Number of bytes: 1; Code: ISO-8859-1

Number of bytes: 1; encoding: UTF-8

Chinese characters:

Number of bytes: 2; Code: GB2312

Number of bytes: 2; Code: GBK

Number of bytes: 1; Code: ISO-8859-1

Number of bytes: 3; encoding: UTF-8

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