1. Click to learn the excellent courses of famous teachers from big factories with the inverse number of minus sign.
This is the easiest way. Just add a minus sign directly before the number, for example:
```
int num = 10；
intnegative num =-num； //negative enum will be-10.
```
2. Subtract 2 times the value.
This method is to subtract twice the value from a positive number, for example:
```
int num = 10；
intnegative num = num-(2 * num)； //negative enum will be-10.
```
3. Use bit operations
Bit operators in Java can be used to perform binary bit operations on integers. Where "~" is a bit inversion operator, which can invert all binary bits, for example:
```
int num = 10；
intnegative num = ~ num+ 1； //negative enum will be-10.
```
The principle of this method is to invert a positive binary bit to get a complement, and then add 1 to get a negative complement. The decimal value of this negative number is the negative number we need.
In short, there are many ways to convert positive numbers into negative numbers in Java, and developers can choose the most suitable method according to their own needs.
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