How many bytes are int in java?

Byte: byte: a unit of measurement used to measure storage capacity; bit: bit

One byte is equal to 8 bits (Recommended learning: java course)

1byte = 8bit

int The data type is 4 bytes, 32 bits, signed An integer represented by two's complement;

Generally, integer variables default to int type;

The default value is 0; int variable names and values ​​are both stored In stack memory, and the data in stack memory can be shared.

Example:

int a = 10, int b = -10。

Thinking: What is the value range of an int? How is it stored in memory?

Answer: Its value range is: [-2 to the 31st power (-2147483648), 2 to the 31st power minus one (2147483647)], it is in memory The

stored in the form of two's complement (the binary digit corresponding to a positive number is inverted and added by 1) is first presented with the code and observed through the execution results of the following code

public class Test {
 
    public static void main(String[] args) {
        // 2的31次方
        int j = (int) Math.pow(2,31);
        System.out.println("j的值" + j);
    }
}

Run result:

j的值2147483647

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