I am trying to simplify the following code.
The basic steps that the code should carry out are as follows:
- Assign String a default value
- Run a method
- If the method returns a null/empty string leave the String as default
- If the method returns a valid string set the String to this result
A Simple example would be:
String temp = System.getProperty("XYZ"); String result = "default"; if(temp != null && !temp.isEmpty()){ result = temp; }
I have made another attemp using a ternary operator:
String temp; String result = isNotNullOrEmpty(temp = System.getProperty("XYZ")) ? temp : "default";
The isNotNullOrEmpty() Method
private static boolean isNotNullOrEmpty(String str){ return (str != null && !str.isEmpty()); }
Is it possible to do all of this in-line? I know I could do something like this:
String result = isNotNullOrEmpty(System.getProperty("XYZ")) ? System.getProperty("XYZ") : "default";
But I am calling the same method twice. I would be something like to do something like this (which doesn’t work):
String result = isNotNullOrEmpty(String temp = System.getProperty("XYZ")) ? temp : "default";
I would like to initialize the ‘temp’ String within the same line. Is this possible? Or what should I be doing?
Thank you for your suggestions.
Tim
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Answer
If using JDK 9 +, use Objects.requireNonNullElse(T obj, T defaultObj)