重新排列日志文件

/*
 * 思路：
 * 1. 使用Stream对日志进行分类和排序。
 * 2. 将字母日志和数字日志分开处理，最后合并结果。
 */

import java.util.*;
import java.util.stream.Collectors;

public class LogReorderStream {
    public String[] reorderLogFiles(String[] logs) {
        List<String> letterLogs = Arrays.stream(logs)
            .filter(log -> !Character.isDigit(log.split(" ")[1].charAt(0)))
            .sorted((log1, log2) -> {
                String logBody1 = log1.substring(log1.indexOf(' ') + 1);
                String logBody2 = log2.substring(log2.indexOf(' ') + 1);
                int cmp = logBody1.compareTo(logBody2);
                if (cmp != 0) return cmp;
                return log1.compareTo(log2);
            })
            .collect(Collectors.toList());

        List<String> digitLogs = Arrays.stream(logs)
            .filter(log -> Character.isDigit(log.split(" ")[1].charAt(0)))
            .collect(Collectors.toList());

        letterLogs.addAll(digitLogs);
        return letterLogs.toArray(new String[0]);
    }
}