我想知道如何从一个字符串中解析几个双数,但是字符串可以混合,例如:String s = "text 3.454 sometext5.567568more_text"
.
I would like to know how to parse several double numbers from a string, but string can be mixed, for instance: String s = "text 3.454 sometext5.567568more_text"
.
标准方法(Double.parseDouble
)不合适.我尝试使用 isDigit
方法解析它,但是如何解析其他字符和 .
?
The standard method (Double.parseDouble
) is unsuitable. I've tried to parse it using the isDigit
method, but how to parse other characters and .
?
谢谢.
在使用此代码或其他帖子中的合适正则表达式解析双打后,迭代以将匹配的双打添加到列表中.在这里,您可以在代码中的其他任何地方使用 myDoubles
.
After parsing your doubles with the suitable regular expressions like in this code or in other posts, iterate to add the matching ones to a list. Here you have myDoubles
ready to use anywhere else in your code.
public static void main ( String args[] )
{
String input = "text 3.454 sometext5.567568more_text";
ArrayList < Double > myDoubles = new ArrayList < Double >();
Matcher matcher = Pattern.compile( "[-+]?\d*\.?\d+([eE][-+]?\d+)?" ).matcher( input );
while ( matcher.find() )
{
double element = Double.parseDouble( matcher.group() );
myDoubles.add( element );
}
for ( double element: myDoubles )
System.out.println( element );
}
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