test&lab

DataLabs/lab4/LinkedBagDemo.java

@@ -0,0 +1,85 @@
+/** A test of the methods add, toArray, isEmpty, and getCurrentSize, 
+    as defined in the first draft of the class LinkedBag.
+    @author Frank M. Carrano
+    @version 4.0
+*/
+public class LinkedBagDemo
+{
+	public static void main(String[] args) 
+	{
+      System.out.println("Creating an empty bag.");
+      BagInterface<String> aBag = new LinkedBag<>();
+      testIsEmpty(aBag, true);
+		displayBag(aBag);
+      
+      String[] contentsOfBag = {"A", "D", "B", "A", "C", "A", "D"};
+		testAdd(aBag, contentsOfBag);
+		testIsEmpty(aBag, false);
+	} // end main
+   
+   // Tests the method isEmpty.
+   // Precondition: If the bag is empty, the parameter empty should be true;
+   // otherwise, it should be false.
+	private static void testIsEmpty(BagInterface<String> bag, boolean empty)
+   {
+      System.out.print("\nTesting isEmpty with ");
+      if (empty)
+         System.out.println("an empty bag:");
+      else
+         System.out.println("a bag that is not empty:");
+      
+      System.out.print("isEmpty finds the bag ");
+      if (empty && bag.isEmpty())
+			System.out.println("empty: OK.");
+		else if (empty)
+			System.out.println("not empty, but it is: ERROR.");
+		else if (!empty && bag.isEmpty())
+			System.out.println("empty, but it is not empty: ERROR.");
+		else
+			System.out.println("not empty: OK.");      
+	} // end testIsEmpty
+   // Tests the method add.
+	private static void testAdd(BagInterface<String> aBag, String[] content)
+	{
+		System.out.print("Adding the following " + content.length +
+                       " strings to the bag: ");
+		for (int index = 0; index < content.length; index++)
+		{
+			if (aBag.add(content[index]))
+            System.out.print(content[index] + " ");
+         else
+            System.out.print("\nUnable to add " + content[index] +
+                             " to the bag.");
+		} // end for
+      System.out.println();
+      
+		displayBag(aBag);
+	} // end testAdd
+   
+   // Tests the method toArray while displaying the bag.
+	private static void displayBag(BagInterface<String> aBag)
+	{
+		System.out.println("The bag contains the following string(s):");
+		Object[] bagArray = aBag.toArray();
+		for (int index = 0; index < bagArray.length; index++)
+		{
+			System.out.print(bagArray[index] + " ");
+		} // end for
+		
+		System.out.println();
+	} // end displayBag
+} // end LinkedBagDemo1
+/*
+ Creating an empty bag.
+ 
+ Testing isEmpty with an empty bag:
+ isEmpty finds the bag empty: OK.
+ The bag contains the following string(s):
+ 
+ Adding the following 7 strings to the bag: A D B A C A D
+ The bag contains the following string(s):
+ D A C A B D A
+ 
+ Testing isEmpty with a bag that is not empty:
+ isEmpty finds the bag not empty: OK.
+*/