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| 2. 33. 1. 数字解析 |
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Parsing is to do with the conversion of a string into a number or a date. |
The purpose of number parsing is to convert a string into a numeric primitive type.
Byte, Short, Integer, Long, Float, and Double classes, provide static methods to parse strings.
For example, the Integer class has the parseInteger method with the following signature. |
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public static int parseInt (String s) throws NumberFormatException
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- The Byte class provides the parseByte method,
- The Long class the parseLong method,
- The Short class the parseShort method,
- The Float class the parseFloat method, and
- The Double class the parseDouble method.
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If the String does not contain a valid integer representation, a NumberFormatException will be thrown.
For example, the following snippet uses parseInt to parse the string "123" to 123. |
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public class MainClass{
public static void main(String[] args){
int x = Integer.parseInt ("123");
}
}
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