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This article mainly shows you how to convert strings to integers in java. The content is simple and clear. I hope it can help you solve your doubts. Let me take you to study and learn this article "how to convert strings to integers in java".

Converts a string to an integer.

This function first discards as many space characters as needed until the first non-space character is found. If the first non-empty character is a positive or negative sign, select the symbol and combine it with as many consecutive numbers as possible, and that part of the character is the value of the integer. If the first non-null character is a number, it is directly combined with subsequent consecutive numeric characters to form an integer.

A string can include extra characters after the characters that form an integer, which can be ignored and have no effect on the function.

No conversion occurs when the first sequence of non-empty characters in a string is not a valid integer, or when the string is empty, or when the string contains only white space characters.

If the function cannot perform a valid conversion, 0 is returned.

Description:

Suppose our environment can only store 32-bit signed integers with a numerical range of [− 231,231 − 1]. If the value exceeds the representable range, it returns INT_MAX (231 − 1) or INT_MIN (− 231).

Example 1:

Enter: "42"

Output: 42

Example 2:

Enter: "- 42"

Output:-42

Explanation: the first non-white space character is'-', which is a negative sign. We try to combine the minus sign with all the consecutive numbers that follow, and we get-42.

Example 3:

Enter: "4193 with words"

Output: 4193

Explanation: the conversion ends with the number'3' because its next character is not a number.

Example 4:

Enter: "words and 987"

Output: 0

Explanation: the first non-empty character is' wicked, but it is not a number or a positive or negative sign. Therefore, a valid conversion cannot be performed.

Example 5:

Enter: "- 91283472332"

Output:-2147483648

Explanation: the number "- 91283472332" exceeds the range of 32-bit signed integers. So INT_MIN (− 231) is returned.

The code is as follows:

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