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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.

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package it.unimi.dsi.fastutil.ints;

import static org.junit.Assert.assertEquals;
import it.unimi.dsi.fastutil.io.BinIO;

import java.io.File;
import java.io.IOException;

import org.junit.Test;

public class IntHeapPriorityQueueTest {
	@SuppressWarnings("deprecation")
	@Test
	public void testSerialize() throws IOException, ClassNotFoundException {
		IntHeapPriorityQueue q = new IntHeapPriorityQueue();
		for( int i = 0; i < 100; i++ ) q.enqueue( i );
		
		File file = File.createTempFile( getClass().getPackage().getName() + "-", "-tmp" );
		file.deleteOnExit();
		BinIO.storeObject( q, file );
		IntHeapPriorityQueue r = (IntHeapPriorityQueue)BinIO.loadObject( file );
		file.delete();
		for( int i = 0; i < 100; i++ ) {
			assertEquals( q.first(), r.first() );
			assertEquals( q.dequeue(), r.dequeue() );
		}
	}
}