public static String unicodeEscaped(Character ch) {
        if (ch == null) {
            return null;
        }
        return unicodeEscaped(ch.charValue());
    }
<p>Converts the string to the Unicode format '\u0020'.</p>

<p>This format is the Java source code format.</p>

<p>If {@code null} is passed in, {@code null} will be returned.</p>

<pre>
  CharUtils.unicodeEscaped(null) = null
  CharUtils.unicodeEscaped(' ')  = "\u0020"
  CharUtils.unicodeEscaped('A')  = "\u0041"
</pre>

@param ch  the character to convert, may be null
@return the escaped Unicode string, null if null input
android/android_framework/base/src/main/java/lang3/CharUtils.java