从字符串中提取整数并将其添加到Java中 [英] Extract integers from string and add them in Java

问题描述

我想从字符串中提取整数并添加它们.

I want to extract the integers from string and add them.

Ex:

String s="ab34yuj789km2";

我应该从中获得825的整数输出(即34 + 789 + 2 = 825)

I should get the output of integers from it as 825 ( i.e., 34 + 789 + 2 = 825 )

推荐答案

这是使用String.split的一种方法:

Here's one way, by using String.split:

public static void main(String[] args) {
    String s="ab34yuj789km2";
    int total = 0;
    for(String numString : s.split("[^0-9]+")) {
        if(!numString.isEmpty()) {
            total += Integer.parseInt(numString);
        }
    }
    // Print the result
    System.out.println("Total = " + total);
}

请注意模式"[^ 0-9] +" 是正则表达式.它匹配一个或多个非十进制数字的字符.还有一个用于小数的 \ d 模式.

Note the pattern "[^0-9]+" is a regular expression. It matches one or more characters that are not decimal numbers. There is also a pattern \d for decimal numbers.

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