split String - 从String的中间获取String的一部分

Question

我想从字符串中获取一个数字 -

if (list.get(k).contains("Total Weight: "))
{
    //get the number between "Total Weight: " and "tonnes" and make it a float
}

字符串看起来像这样

Carriage ID Number: 1
Carriage type: Passenger Carriage
Tare Weight: 5.0
Total Weight: 9.725 tonnes
Number of passengers: 45

或

Carriage ID Number: 2
Carriage type: Goods Carriage
Tare Weight: 3.0
Total Weight: 8.0 tonnes
Goods Weight: 5.0 tonnes
Goods Description: Lego

Answer 1

使用空格字符拆分字符串，将第3个字符串转换为浮点数：

String s = "Total Weight: 9.725 tonnes";
float tonnes = Float.parseFloat(s.split(" ")[2]);

Answer 2

试试这个正则表达式： import java.util.regex.Pattern; String test = (Total Weight\:)\s*([0-9]*[\.]*[0-9]*)\s*(tonnes); Pattern pattern = Pattern.compile (test); Matcher result = pattern.matcher (yourInput); If result.find () yourAnswer = result.group (2);