How to determine whether a character is a number in java

1. Use regular expressions to check whether the character is a number. If it is, it will return true, if not, it will be false

2. Use The function "Character.isDigit" that comes with java determines whether a character is a number. The specific code is as follows:

#3. You can use the indexof index to determine whether a character is a number. See the code. Picture below:

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