Map getOrDefault VS getOrUseSupplier

I am starting to learn lambdas and i do not understand why java Map has: getOrDefault(Object key, V defaultValue) and not(working just the same, but if value is absent, then defaultValue will be …

Java 8: Lambda with variable arguments

I am looking for a way to invoke multiple argument methods but using a lambda construct. In the documentation it is said that lambda is only usable if it can map to a functional interface. I want to …

Why does Stream.allMatch() return true for an empty stream?

My colleague and I had a bug that was due to our assumption that an empty stream calling allMatch() would return false. if (myItems.allMatch(i -> i.isValid()) { //do something } Of course, …

Java access bean methods with LambdaMetafactory

my question is strongly related to Explicit use of LambdaMetafactory in that thread, some very good examples are provided to use the LambdaMetafactory to access a static method of a class; however, I …

Are lambdas garbage collected?

If I’m not mistaken, under certain situations a lambda in Java is generated as an anonymous class instance. For example, in this code the lambda needs to capture a variable from the outside: final …

Java 8: Where is TriFunction (and kin) in java.util.function? Or what is the alternative?

I see java.util.function.BiFunction, so I can do this: BiFunction f = (x, y) -> { return 0; }; What if that is not good enough and I need TriFunction? It doesn’t …