如何在Java中将字符串中的大十进制数字转换为十六进制？

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

public class DecimalToHex {
    public static void main(String[] args) {
        String input = "This is a string with decimal numbers: 123, 456, and 789.";
        String pattern = "\\b\\d+\\b"; // 正则表达式匹配大十进制数字

        Pattern p = Pattern.compile(pattern);
        Matcher m = p.matcher(input);

        StringBuffer sb = new StringBuffer();
        while (m.find()) {
            int decimal = Integer.parseInt(m.group()); // 将大十进制数字转换为整数
            String hex = Integer.toHexString(decimal); // 将整数转换为十六进制字符串
            m.appendReplacement(sb, hex);
        }
        m.appendTail(sb);

        String result = sb.toString();
        System.out.println("转换后的字符串：" + result);
    }
}