如何从 java 中的字符串数组中获取数字

Question

i have a string like String[] str = {"[5, 2, 3]","[2, 2, 3, 10, 6]"} and i need to take numbers to add into an integer list.

i tried to split first index into numbers to see if it will work, looks like:

String[] par = str[0].split("[, ?.@]+");

After the split i tried to see what array i get:

for(String a: par)
    System.out.println(a);

But when i wrote that code i get an array like this:

[5
2
3]

So, how can i get rid of this square brackets?

Answer 1

Instead of your current pattern, I would use \\D+ which will split on one or more non-digits. Add a guard for the empty string too. Something like

String[] str = { "[5, 2, 3]", "[2, 2, 3, 10, 6]" };
for (String par : str) {
    for (String t : par.split("\\D+")) {
        if (t.isEmpty()) {
            continue;
        }
        System.out.println(Integer.parseInt(t));
    }
}

Outputs

5
2
3
2
2
3
10
6