How values in Java are represented in a computer

Many children who have just studied Java do not understand why the int is sometimes turned into a negative number when strongly converted to byte.

This is because you do not understand the representation of numeric values in Java.

java specifies a negative number in the form of twos complement.

With the concept above, we know why the high-precision conversion of low-precision types can sometimes become negative.

For example, int 232 to byte value becomes-24

The conversion process is as follows:

232 is stored in the computer as follows:

00000000 00000000 00000000 11101000

To byte after the high-level storage is as follows:

11101000

The highest bit of this value is 1: So he is a negative number, expressed in twos complement. Then we can figure out what the value of this negative number is.

The inverse code is:

10010111

The original code is:

10011000

So his value is:-24

How values in Java are represented in a computer