如何转换此字符串： 这个字符串包含unicode字符unicodetoString（“\ u0064”）和字符串到unicode，如stringtounicode（“a”）？
public static String GetUnicode(String str_code) {
String hexCode = Integer.toHexString(str_code.codePointAt(0)).toUpperCase();
String hexCodeWithAllLeadingZeros = "0000" + hexCode;
String hexCodeWithLeadingZeros = hexCodeWithAllLeadingZeros
.substring(hexCodeWithAllLeadingZeros.length() - 4);
hexCodeWithLeadingZeros = "\\u" + hexCodeWithLeadingZeros;
System.out.println("Unicode " + hexCodeWithLeadingZeros);
return hexCodeWithLeadingZeros;
}