Java悬赏问题，Java语言如何展开字符串：

Question

Java悬赏问题，Java语言如何展开字符串

String s = "3a11b7cdef2b5e";
转换成
aaabbbbbbbbbbbcccccccdefbbeeeee

Answer 1

这个问题很有趣，忍不住尝试了一把

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

public class Test {

    public static void main(String[] args) throws Exception{

        String s = "3a11b7cdef2b5e";
        String regex = "\\d*[a-zA-Z]";
        Pattern pattern = Pattern.compile (regex);
        Matcher matcher = pattern.matcher (s);
        String[] array = new String[0];
        while (matcher.find ()){
            String[] cloned = new String[array.length + 1];
            System.arraycopy (array, 0, cloned, 0, cloned.length - 1);
            cloned[cloned.length - 1] = matcher.group ();
            array = cloned;
        }

        StringBuffer sbBuffer=new StringBuffer();
        for ( String str2 : array ){
            //System.out.println (str2);
            String[] strArr=str2.split("[a-zA-Z]");
            if(strArr.length==1) {
                str2=str2.replace(strArr[0], "");
                int i=Integer.parseInt(strArr[0]);
                for (int j=0;j<i;j++) {
                    sbBuffer.append(str2);
                }
            }else {
                sbBuffer.append(str2);
            }
        }

        System.out.println(sbBuffer.toString());//aaabbbbbbbbbbbcccccccdefbbeeeee
    }
}