/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String[] arr = { "a1", "c🕒", "b2", "d4" };
        Arrays
            .sort(
                arr , 
                Comparator
                .comparingInt( String::length )
                .thenComparing( Comparator.naturalOrder() )
            );
        System.out.println( Arrays.toString( arr ) );
	}
}

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