如何从输入模式如下的java字符串输入中提取正整数和负整数？

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class NumberExtractor {
    public static void main(String[] args) {
        String input = "abc 123 def -456 ghi 789";
        List<Integer> positiveIntegers = extractPositiveIntegers(input);
        List<Integer> negativeIntegers = extractNegativeIntegers(input);

        System.out.println("Positive Integers: " + positiveIntegers);
        System.out.println("Negative Integers: " + negativeIntegers);
    }

    public static List<Integer> extractPositiveIntegers(String input) {
        List<Integer> positiveIntegers = new ArrayList<>();
        Pattern pattern = Pattern.compile("\\b\\d+\\b");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
            int number = Integer.parseInt(matcher.group());
            if (number > 0) {
                positiveIntegers.add(number);
            }
        }

        return positiveIntegers;
    }

    public static List<Integer> extractNegativeIntegers(String input) {
        List<Integer> negativeIntegers = new ArrayList<>();
        Pattern pattern = Pattern.compile("-\\b\\d+\\b");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
            int number = Integer.parseInt(matcher.group());
            negativeIntegers.add(number);
        }

        return negativeIntegers;
    }
}

Positive Integers: [123, 789]
Negative Integers: [-456]