Disposing of objects

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You can integrate the Java garbage collector with your .NET objects using Javonet. When you create an .NET object and store it in a Java variable, it will be handled in .NET process as long as your variable lives in the Java memory.

When Java collects the NObject object, this event is passed to .NET, and the corresponding .NET object is disposed and collected. If the .NET object implements the IDisposable interface, then the appropriate disposal procedure is followed.

You can also force object disposal by calling the "Dispose" method on the "NObject" object. Javonet exposes the dedicated "Dispose" method for closing all objects and releasing .NET memory. This method should be called only at the end of your Java application.

Assuming we have a custom .NET Framework DLL with the following class inside:

using System;

namespace TestNamespace
{
	public class TestClass
	{
		public TestClass() { }
		~TestClass()
		{
			Console.WriteLine("Displaying object from .NET destructor message");
		}
		public static int MyStaticField { get; set; }
		public int MyInstanceField { get; set; }

		public static string SayHello(string name)
		{
			return "Hello " + name;
		}

		public int MultiplyByTwo(int arg)
		{
			return arg * 2;
		}

		public T MyGenericMethod<T>(T arg1)
		{
			return arg1;
		}
		public K MyGenericMethodWithTwoTypes<T, K>(T arg1)
		{
			return default(K);
		}

		public void MethodWithRefArg(ref int arg)
		{
			arg = arg + 44;
		}

		public string PassTypeArg(Type myType)
		{
			return myType.ToString();
		}

		public string MethodWithEnumArg(SampleEnum value)
		{
			return value.ToString();
		}
	}
}

To see how destructor fro .NET works:

I code in:
// Todo: activate Javonet and add reference to .NET library

// create instance
NObject sampleObject = Javonet.New("TestNamespace.TestClass");

// some operations with object
sampleObject.set("MyInstanceField", 22);

//Clearing the object reference so it will be removed by garbage collector
sampleObject = null;

See Live Example!

Additional references