java随机生成16位UUID

public String getuuid(){
UUID uuid=UUID.randomUUID();
String str = uuid.toString();
String uuidStr=str.replace("-", "");
return uuidStr;
}

public String getuuid(String str){
UUID uuid=UUID.nameUUIDFromBytes(name.getBytes());
String str = uuid.toString();
String uuidStr=str.replace("-", "");
return uuidStr;
}