SystemGCUseCase

package com.vaani.java.gc;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

public class MappedFileGc {
	public static void main(String[] args) throws IOException {

		File tempFile = File.createTempFile("Temp", null);
		tempFile.deleteOnExit();
		RandomAccessFile raTempFile = new RandomAccessFile(tempFile, "rw");
		FileChannel fChannel = raTempFile.getChannel();

		MappedByteBuffer mappedBuffer = fChannel.map(
				FileChannel.MapMode.READ_WRITE, 0, 512);

		fChannel.close();
		raTempFile.close();
		mappedBuffer = null;

  	System.gc();

		if (tempFile.delete())
			System.out.println("Successfully deleted: " + tempFile);
		else
			System.out.println("Unable to delete: " + tempFile);
	}
}