Question

I have a string builder and it contains some data.I want to ensure whenever there is a null or empty(“”) data in it, i want to replace it with some message e.g not available. This is a huge data and i cannot go and replace each and every String.
Following is a snippet of code :

Stringbuilder sb = new Stringbuilder();
String a = "10";
String b = 13;
sb.append("entity.id=").append(a).append("entity.value=").append(b);
sb.toString;

So whenever entity.id or entity.”ANYTHING” equals “null” or is empty, it should be replaced with a message like entity.id= not available

Answer 1

Create a function, for example…

public String checkString(String str) {
 if(str == null || str.isEmpty())
  return "N/A";
 return str;
}

Call it on a String you want to append.

sb.append("entity.id=").append(checkString(a)).append("entity.value=").append(checkString(b));