/* 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 str = "é😅";
StringBuilder sb = new StringBuilder(str.length());
for (int i = 0; i < str.length(); ++i) {
  char c = str.charAt(i);
  if (Character.isHighSurrogate(c) || Character.isLowSurrogate(c)) {
    // Append the escaped character.
    sb.append("\\u");
    sb.append(String.format("%04x", (int) c));
  } else {
    // Append the character as-is.
    sb.append(c);
  }
}
String partlyEscaped = sb.toString();
System.out.println(partlyEscaped);
	}
}

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