The ternary operator ? java is giving me error using it in the following way:
ArrayList <String> titleTabs= new ArrayList<>();
ArrayList <String> countTitleTabs= new ArrayList<>();
public ViewPagerAdapter(ArrayList<String> titleTabs, ArrayList<String> countTitleTabs) {
titleTabs.get(0).isEmpty() ? this.titleTabs.add(0,"----") : this.titleTabs.add(0,titleTabs.get(0));
}
What am I doing wrong?
The ternary operator ? is also known as conditional . So, use it to assign a value based on a given condition.
In your case it would be:
this.titleTabs.add(0, (titleTabs.get(0).isEmpty() ? "----" : titleTabs.get(0)));
Since the first value is the same in both cases, only the second changes and the construction form of that operator is:
valorDeseado = (condición)? valorSiSeCumple : valorSi_NO_SeCumple;
The ternary operator is used to return a value, not to perform operations. Your code should be something like this:
valor = titleTabs.get(0).isEmpty()?"----":titleTabs.get(0);
this.titleTabs.add(0,valor);
or
this.titleTabs.add(0,titleTabs.get(0).isEmpty()?"----":titleTabs.get(0));
In the cases that I had to use it, I used it as follows:
algunObjetoJson.addProperty("accion",(null != algo.getNombre() ? "<a href="">HolaJuan</a>" : "<a href="">HolaAlguien</a>"));
Both ? and : must assign a value followed by them.