1 files changed, 168 insertions, 0 deletions
diff --git a/labs/lab03_dll/DLinkedListTester.java b/labs/lab03_dll/DLinkedListTester.java
new file mode 100644
index 0000000..b583e84
--- /dev/null
+++ b/labs/lab03_dll/DLinkedListTester.java
@@ -0,0 +1,168 @@
+import java.util.Random;
+
+public class DLinkedListTester
+{
+	public static void main(String[] args)
+	{
+		// Construct a list and add entries
+		
+		int numberOfData = 100000;	// number of data to add to the list
+		int maxDataValue = 10000;	// number of different values to add to the list
+		int numSampling = 10000;	// number of calling the method getEntry
+		int dryRunReps = numSampling / 1000;
+		
+		DLinkedList<Integer> list = new DLinkedList<Integer>();
+		
+		Random rand = new Random();
+		rand.setSeed(System.nanoTime());
+		
+		System.out.print("Adding data into the list: ");
+		
+		for(int i = 0; i < numberOfData; i++)
+		{
+			list.add(rand.nextInt(maxDataValue));
+		}
+		
+		System.out.println("DONE");
+		
+		int[] positions = new int[numSampling];
+		int[] returnValues = new int[numSampling];
+
+		System.out.print("Dry run for the method getEntry(): ");
+		
+		// Dry run for the method getEntry1 (no timer)
+		// Also store all result for testing the method getEntry2()
+		
+		for(int i = 0; i < numSampling; i++)
+		{
+			int aPosition = rand.nextInt(numberOfData) + 1;
+			positions[i] = aPosition;
+			returnValues[i] = list.getEntry(aPosition);
+		}
+		
+		System.out.println("DONE");
+		
+		double startTime;	// Start time millisecond
+		double endTime;		// End time millisecond
+
+		System.out.print("Time the method getEntry(): ");
+		
+		// Timing the method getEntry()
+		
+		startTime = System.currentTimeMillis();
+		
+		for(int i = 0; i < numSampling; i++)
+		{
+			if(returnValues[i] != list.getEntry(positions[i]))
+			{
+				System.out.println("There is something wrong.");
+				System.out.println("The entry in position " + positions[i] + " should be " + returnValues[i] + ".");
+				System.out.println("But the method getEntry(" + positions[i] + ") returns " + list.getEntry(positions[i]) + ".");
+				System.out.println("Fix the method getNodeAt() first.");
+				return;
+			}
+		}
+		
+		endTime = System.currentTimeMillis();
+		
+		double getEntryTime = endTime - startTime;
+		
+		System.out.println("DONE");
+
+		// getEntry1() - Solution 1
+
+		// Dry run (no timer)
+
+		System.out.print("Dry run for the method getEntry1(): ");
+		
+		for(int i = 0; i < dryRunReps; i++)
+		{
+			if(returnValues[i] != list.getEntry1(positions[i]))
+			{
+				System.out.println("There is something wrong.");
+				System.out.println("The entry in position " + positions[i] + " should be " + returnValues[i] + ".");
+				System.out.println("But the method getEntry1(" + positions[i] + ") returns " + list.getEntry1(positions[i]) + ".");
+				System.out.println("Fix the method getNodeAt1() first.");
+				return;
+			}
+		}
+
+		System.out.println("DONE");
+		
+		// Timing the method getEntry1()
+		
+		System.out.print("Time the method getEntry1(): ");
+		
+		startTime = System.currentTimeMillis();
+		
+		for(int i = 0; i < numSampling; i++)
+		{
+			if(returnValues[i] != list.getEntry1(positions[i]))
+			{
+				System.out.println("There is something wrong.");
+				System.out.println("The entry in position " + positions[i] + " should be " + returnValues[i] + ".");
+				System.out.println("But the method getEntry1(" + positions[i] + ") returns " + list.getEntry1(positions[i]) + ".");
+				System.out.println("Fix the method getNodeAt1() first.");
+				return;
+			}
+		}
+		
+		endTime = System.currentTimeMillis();
+		
+		double getEntry1Time = endTime - startTime;
+		
+		System.out.println("DONE");
+	
+		// getEntry2() - Solution 2
+
+		// Dry run (no timer)
+
+		System.out.print("Dry run for the method getEntry2(): ");
+		
+		for(int i = 0; i < dryRunReps; i++)
+		{
+			if(returnValues[i] != list.getEntry2(positions[i]))
+			{
+				System.out.println("There is something wrong.");
+				System.out.println("The entry in position " + positions[i] + " should be " + returnValues[i] + ".");
+				System.out.println("But the method getEntry2(" + positions[i] + ") returns " + list.getEntry2(positions[i]) + ".");
+				System.out.println("Fix the method getNodeAt2() first.");
+				return;
+			}
+		}
+
+		System.out.println("DONE");
+		
+		// Timing the method getEntry2()
+		
+		System.out.print("Time the method getEntry2(): ");
+		
+		startTime = System.currentTimeMillis();
+		
+		for(int i = 0; i < numSampling; i++)
+		{
+			if(returnValues[i] != list.getEntry2(positions[i]))
+			{
+				System.out.println("There is something wrong.");
+				System.out.println("The entry in position " + positions[i] + " should be " + returnValues[i] + ".");
+				System.out.println("But the method getEntry2(" + positions[i] + ") returns " + list.getEntry2(positions[i]) + ".");
+				System.out.println("Fix the method getNodeAt2() first.");
+				return;
+			}
+		}
+		
+		endTime = System.currentTimeMillis();
+		
+		double getEntry2Time = endTime - startTime;
+		
+		System.out.println("Done\n");
+		
+		
+		System.out.println("The method getEntry() took " + getEntryTime + " millisecond.");
+		System.out.println("The method getEntry1() took " + getEntry1Time + " millisecond.");
+		System.out.println("The method getEntry2() took " + getEntry2Time + " millisecond.\n");
+		
+		System.out.println("If getEntry1() took roughly about half the time of getEntry(), you get 5 points.");
+		System.out.println("If getEntry2() took roughly about a quarter the time of getEntry(), you get 5 points.");
+	}
+}