Mayur Patil :
I am new to Java, kinda transition from C# to Java. java.util.function has a interface defined as Function which is input to computeIfAbsent method of Map.
I wanted to define and delegate that function to computeIfAbsent method.
map.computeIfAbsent(key, k => new SomeObject())
works but I wanted it with callback where func. But the problem is Function requires input parameter to be defined. How can I set it to void or with no argument.
map.computeIfAbsent(key, func);
Eran :
computeIfAbsent will always have an input parameter for the passed Function - that would be the key.
Therefore, just as you can write:
map.computeIfAbsent(key, k -> new SomeObject());
you can also write (assuming the key of your Map is a String):
Function<String,SomeObject> func = k -> new SomeObject();
map.computeIfAbsent(key, func);