What is the value range of java integer

The value range of java integer is from [-2147483648 to 2147483647], including [-2147483648] and [2147483647]. The highest efficiency is when the value is [-128--127].

java The value range of integer is:

The value of the Integer class is consistent with the value of the int type. The value range is from -2147483648 to 2147483647 (-231 to 231-1), including -2147483648 and 2147483647.

But for the Integer class, in order to improve efficiency, Java initializes integer objects between -128--127, so the Integer class is most efficient when it takes a value of -128--127.

Test:

public class Integertest { public static void main(String[] args) {
          System.out.println("最大取值：" + Integer.MAX_VALUE);
          System.out.println("最小取值：" + Integer.MIN_VALUE);
         }
}

Output:

最大取值：2147483647 最小取值：-2147483648

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