如何对给定行中的第一个单词进行子串

Question

版本scala 2.10。+

我有一个地址

 420 Bedok North aveneu 2

我需要的只是提取

420 

超出给定的行。如何获得它？

Answer 1

val address = "420 Bedok North aveneu 2"
address.takeWhile(_ != ' ')

Answer 2

val address = "420 Bedok North aveneu 2"
address.split(" ").head

Answer 3

var str = '420 Bedok North aveneu 2';
var newStr = '';
for (var i = 0; i < str.length; i ++) {
    if (str.substring(i, i+1) == ' ') {
      break;
    } else {
       newStr += str.substring(i, i+1);
    }
}