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How to convert a string into an integer array in java
arg . charat(I)-“0”； And arg.charAt(i)

Arg.charAt(i)-'0' is an ascii code, which subtracts 0 from the previous ascii code.

For example, arg.charAt(i) represents the character f.

The ascii code of f is 102.

Ascii code 48 of 0

102-48=54

Ascii code 54 stands for character 6 (f ranks sixth among 26 letters).

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