Sandbox::https://github.com/prashanthigupta/leetcode-algorithms/blob/master/src/ReorderDataInLogFiles.java

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import java.util.Arrays;

public class ReorderDataInLogFiles {

public String[] reorderLogFiles(String[] logs) {

Arrays.sort(logs, (log1, log2) -> {

String[] split1 = log1.split(" ", 2);

String[] split2 = log2.split(" ", 2);

boolean isDigit1 = Character.isDigit(split1[1].charAt(0));

boolean isDigit2 = Character.isDigit(split2[1].charAt(0));

// case 1). both logs are letter-logs

if (!isDigit1 && !isDigit2) {

// first compare the content

int cmp = split1[1].compareTo(split2[1]);

if (cmp != 0) return cmp;

// logs of same content, compare the identifiers

return split1[0].compareTo(split2[0]);

}

// case 2). one of logs is digit-log

if (!isDigit1)

// the letter-log comes before digit-logs

return -1;

else if (!isDigit2)

return 1;

else

// case 3). both logs are digit-log

return 0;

});

return logs;

}