/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.nio.charset.StandardCharsets;
 
/* 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 {
 
		final String input = "\\xF0\\x9F\\x87\\xB7\\xF0\\x9F\\x87\\xBA";
		final String[] inputItems = input.trim().split("\\\\x");
 
		final byte[] test = new byte[inputItems.length];
        test[0] = (byte) 0xF0;
        test[1] = (byte) 0x9F;
        test[2] = (byte) 0x87;
        test[3] = (byte) 0xB7;
        test[4] = (byte) 0xF0;
        test[5] = (byte) 0x9F;
        test[6] = (byte) 0x87;
        test[7] = (byte) 0xBA;
 
 
        final byte[] emojiByte = new byte[inputItems.length];
    	for (int i = 0; i < inputItems.length-1; i++) {
            emojiByte[i] = (byte) Integer.parseInt(inputItems[i+1].replace("0x", ""), 16);
    	}
    	System.out.println(Arrays.toString(test));
        System.out.println(Arrays.toString(emojiByte));
 
        final String testString = new String(test, StandardCharsets.UTF_8);
        final String emojiString = new String(emojiByte, StandardCharsets.UTF_8);
 
        System.out.println(testString);
        System.out.println(emojiString);
        System.out.println(testString.equals(emojiString));
	}
}

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