A synchronized WeakHashMap may be constructed using the Collections.synchronizedMap method.Īn object can have both weak and string (normal) references.Īs long as at least one strong reference exists to the object, the referenced object can never be garbage collected.Ī weak reference by itself doesnot prevent an object from being garbage collected. It supports null values and the null key.

This allows an element in the map to be garbage-collected when the key is unused. With Java it is just ready set go, no matter which IDE, with just one IDE for Java and native, alongside mixed mode debugging (a feature JetBrains doesn't see a value supporting) and not all Java shops are into InteliJ idolatry.A WeakHashMap implements a map that uses a weak reference to the keys. There is an Eclipse plug-in, which is kind of 2nd tier, and none at all for Netbeans. Then one is required to buy into JetBrains tooling for Kotlin, and get an additional license for Clion as means to have a graphical debugger for Kotlin/Native. Calling Scala or Clojure from Java leads to similar lists. Nothing unique to Kotlin per se, all guest languages happen to have similar bumps. When Loom arrives, it will be a similar story, Java proper fibers and Kotlin co-routines and how they might interoperate.

Specially when co-routines and similar higher level constructs get added, or having to deal with compatibility between Java streams and Kotlin sequences, which don't build on top of Java ones. Try to call idiomatic Kotlin code from Java and see how it looks like.

Yep, I mean the semantic model for data structures.

Kotlin weak reference