Exercises

.project

@@ -10,14 +10,8 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
-		<buildCommand>
-			<name>net.sourceforge.pmd.eclipse.plugin.pmdBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
 	</natures>
 </projectDescription>

src/it/unibo/oop/lab/collections2/UserImpl.java

@@ -10,7 +10,7 @@ public class UserImpl implements User {
 
     private final String firstName;
     private final String lastName;
-    private final Integer age;
+    private final int age;
     private final String username;
     /*
      * to be "lazily" initialized.

src/it/unibo/oop/lab/exception1/BaseRobotTest.java

@@ -1,8 +1,10 @@
 package it.unibo.oop.lab.exception1;
 
+import static it.unibo.oop.lab.exception1.RobotEnvironment.WORLD_X_UPPER_LIMIT;
+import static it.unibo.oop.lab.exception1.RobotEnvironment.WORLD_Y_UPPER_LIMIT;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.fail;
 
 import org.junit.Test;
 
@@ -12,48 +14,67 @@
  */
 public final class BaseRobotTest {
 
+    private static final int TEST_BATTERY_LEVEL = 20;
+
     /**
      * Simple test for testing a robot moving, wandering the available
      * environment.
      * 
      */
     @Test
     public void testRobotMovementBase() {
-        /*
-         * FIRST OF ALL, take a look to "TestWithExceptions". Read the source and the
-         * comments very carefully.
-         */
         /*
          *  1) Create a Robot with battery level 100
          */
         final Robot r1 = new Robot("SimpleRobot", 100);
-        // checking if robot is in position x=0; y=0
+        /*
+         * checking if robot in in position x=0; y=0
+         */
         assertEquals("[CHECKING ROBOT INIT POS X]", 0, r1.getEnvironment().getCurrPosX());
         assertEquals("[CHECKING ROBOT INIT POS Y]", 0, r1.getEnvironment().getCurrPosY());
         /*
          * 2) Move the robot right until it touches the world limit
          */
-        for (int i = 0; i < RobotEnvironment.WORLD_X_UPPER_LIMIT; i++) {
-            // check if position if coherent
-            assertTrue("[CHECKING MOVING RIGHT]", r1.moveRight());
+        try {
+            for (int i = 0; i < WORLD_X_UPPER_LIMIT; i++) {
+                r1.moveRight();
+            }
+            /*
+             * this is causing an exception to be raised
+             */
+            r1.moveRight();
+            /*
+             * this must not be reached;
+             */
+            fail("I should not get such far!");
+        } catch (PositionOutOfBoundException e) {
+            assertTrue(e.getMessage().contains("pos(" + (WORLD_X_UPPER_LIMIT + 1) + ", 0)"));
+        } catch (RuntimeException e) { 
+            /*
+             * use a generic exception in a catch clause is always bad idea and you have NEVER to do that.
+             * Here we do that only to be sure that you throw the right exception.
+             */
+            fail("A wrong exception was raised!");
         }
-        // reached the right limit of the world
-        assertFalse("[CHECKING MOVING RIGHT]", r1.moveRight());
-        // checking positions x=50; y=0
-        assertEquals("[MOVING RIGHT ROBOT POS X]", RobotEnvironment.WORLD_X_UPPER_LIMIT, r1.getEnvironment().getCurrPosX());
-        assertEquals("[MOVING RIGHT ROBOT POS Y]", 0, r1.getEnvironment().getCurrPosY());
         /*
          * 2) Move to the top until it reaches the upper right conrner of the world
          */
-        for (int i = 0; i < RobotEnvironment.WORLD_Y_UPPER_LIMIT; i++) {
-            // check if position if coherent
-            assertTrue("[CHECKING MOVING UP]", r1.moveUp());
+        try {
+            for (int i = 0; i < WORLD_Y_UPPER_LIMIT; i++) {
+                // check if position if coherent
+                r1.moveUp();
+            }
+            r1.moveUp();
+        } catch (PositionOutOfBoundException e) {
+            assertTrue(e.getMessage().contains("pos(" + WORLD_X_UPPER_LIMIT + ", " + (WORLD_Y_UPPER_LIMIT + 1) + ")"));
+        } catch (RuntimeException e) { 
+            /*
+             * use a generic exception in a catch clause is always bad idea and you have NEVER to do that.
+             * Here we do that only to be sure that you throw the right exception.
+             */
+            fail("A wrong exception was raised!");
         }
-        // reached the upper limit of the world
-        assertFalse("[CHECKING MOVING UP]", r1.moveUp());
-        // checking positions x=50; y=80
-        assertEquals("[MOVING RIGHT ROBOT POS X]", RobotEnvironment.WORLD_X_UPPER_LIMIT, r1.getEnvironment().getCurrPosX());
-        assertEquals("[MOVING RIGHT ROBOT POS Y]", RobotEnvironment.WORLD_Y_UPPER_LIMIT, r1.getEnvironment().getCurrPosY());
+
     }
 
     /**
@@ -62,26 +83,30 @@ public void testRobotMovementBase() {
      */
     @Test
     public void testRobotBatteryBase() {
-        final Robot r2 = new Robot("SimpleRobot2", 20);
+        final Robot r2 = new Robot("SimpleRobot2", TEST_BATTERY_LEVEL);
         /*
          * Repeatedly move the robot up and down until the battery is completely
          * exhausted.
          */
-        while (r2.getBatteryLevel() > 0) {
-            r2.moveUp();
+        try {
+            while (r2.getBatteryLevel() > 0) {
+                r2.moveUp();
+                r2.moveDown();
+            }
             r2.moveDown();
+            fail("You're not supposed to get that far with no battery!");
+        } catch (PositionOutOfBoundException e) {
+            fail("I expected battery to fail!");
+        } catch (RuntimeException e) { 
+            /*
+             * use a generic exception in a catch clause is always bad idea and you have NEVER to do that.
+             * Here we do that only to be sure that you throw the right exception.
+             * The method getSimpleName is an advanced aspect of java that you'll see later.
+             * It return the runtime class name of the object 
+             */
+            if (!e.getClass().getSimpleName().equals("NotEnoughBatteryException")) {
+                fail("A wrong exception was raised!");
+            }
         }
-        // verify battery level:
-        // expected, actual, delta (accepted error as we deal with decimal
-        // values: in this case we accept NO ERROR, which is generally bad)
-        assertEquals(0d, r2.getBatteryLevel(), 0);
-        // verify position: same as start position
-        assertEquals("[CHECKING ROBOT INIT POS Y]", 0, r2.getEnvironment().getCurrPosY());
-        // out of world: returns false
-        assertFalse("[CHECKING MOVING UP]", r2.moveUp());
-        // recharge battery
-        r2.recharge();
-        // verify battery level
-        assertEquals(100, r2.getBatteryLevel(), 0);
     }
 }

src/it/unibo/oop/lab/exception1/README.md

@@ -34,11 +34,6 @@ Modify `Robot` to make it work with `RobotEnvironment`
 * `moveToPosition` must be changed to account for the changes in `RobotEnvironment.move()`
 * `moveUp` and `moveDown` need a refactoring as well
 
-### `BaseRobotTest`
-
-* Modify `BaseRobotTest.testRobotMovementBase` in order to verify that the exceptions are correctly thrown
-* **HINT**: Use `Assert.fail()` in the try block, and `Assert.assertNotNull()` to verify that the exception message is present
-
 ## Design a new exception
 
 Design and realize `NotEnoughBatteryException`, to be thrown when the robot is asked to move (whatever the direction) in case the battery is not sufficient
@@ -48,6 +43,4 @@ Design and realize `NotEnoughBatteryException`, to be thrown when the robot is a
 * Extend one among: `Exception`, `RuntimeException`, or `IllegalStateException`. Prepare yourself to explain the professor the reason behind your choice.
 * Change the behavior of `moveToPosition` (it must return `void`)
 * Throw an exception if there is not enough battery)
-* Refactor `moveUp` and `moveDown`
-* Modify `BaseRobotTest.testRobotBatteryBase()` to verify that the exception is correctly implemented and thrown
-
+* Refactor `moveUp` and `moveDown`

src/it/unibo/oop/lab/exception2/README.md

@@ -10,4 +10,4 @@ Modify `StrictBankAccountImpl` in such a way that:
 * A `NotEnoughFoundsException` is thrown if there is not enough money for a draw operation to complete
 * A `TransactionsOverQuotaException` is thrown if the count of ATM transactions gets over the maximum allowed
 
-Complete the class `TestStrictBankAccount` using JUnit
+Execute the class `TestStrictBankAccount` to verify that the exceptions are correctly implemented and thrown.

src/it/unibo/oop/lab/exception2/TestStrictBankAccount.java

@@ -1,27 +1,62 @@
 package it.unibo.oop.lab.exception2;
 
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
+
 import org.junit.Test;
 
 /**
  * JUnit test to test
- * {@link StrictBankAccount}.
- * 
+ * {@link it.unibo.oop.lab.exception2.StrictBankAccount}.
  */
 public class TestStrictBankAccount {
 
+    private static final int MAX_ATM_TRANSACTIONS = 10;
+    private static final int INITIAL_AMOUNT = 10_000;
+    private static final int TOO_MUCH = 50_000;
+
     /**
-     * Used to test Exceptions on {@link StrictBankAccount}.
+     * Used to test Exceptions on
+     * {@link it.unibo.oop.lab.exception2.StrictBankAccount}.
      */
     @Test
     public void testBankOperations() {
         /*
-         * 1) Creare due StrictBankAccountImpl assegnati a due AccountHolder a
-         * scelta, con ammontare iniziale pari a 10000 e nMaxATMTransactions=10
+         * TODO: uncomment this test.
+         * 
+         * You can uncomment blocks of code in eclipse by using:
          * 
-         * 2) Effetture un numero di operazioni a piacere per verificare che le
-         * eccezioni create vengano lanciate soltanto quando opportuno, cioè in
-         * presenza di un id utente errato, oppure al superamento del numero di
-         * operazioni ATM gratuite.
+         * Control + Shift + 7 (With an Italian keyboard...)
          */
+//        final AccountHolder usr1 = new AccountHolder("Mario", "Rossi", 1);
+//        final AccountHolder usr2 = new AccountHolder("Luigi", "Bianchi", 2);
+//        final StrictBankAccount account1 = new StrictBankAccount(usr1.getUserID(), INITIAL_AMOUNT, MAX_ATM_TRANSACTIONS);
+//        final StrictBankAccount account2 = new StrictBankAccount(usr2.getUserID(), INITIAL_AMOUNT, MAX_ATM_TRANSACTIONS);
+//        try {
+//            account1.deposit(4, 100);
+//            fail();
+//        } catch (WrongAccountHolderException e) {
+//            assertNotNull(e);
+//        }
+//        for (int i = 0; i < MAX_ATM_TRANSACTIONS; i++) {
+//            try {
+//                account2.depositFromATM(usr2.getUserID(), 1);
+//            } catch (TransactionsOverQuotaException | WrongAccountHolderException e) {
+//                fail("Not exceeded yet max no. transactions!");
+//            }
+//        }
+//        try {
+//            account2.depositFromATM(usr2.getUserID(), 1);
+//            fail("Should raise the exception signaling that we exceeded max no. transactions!");
+//        } catch (TransactionsOverQuotaException | WrongAccountHolderException e) {
+//            assertNotNull(e);
+//        }
+//        try {
+//            account1.withdraw(usr1.getUserID(), TOO_MUCH);
+//        } catch (WrongAccountHolderException e) {
+//            fail();
+//        } catch (NotEnoughFoundsException e) {
+//            assertNotNull(e);
+//        }
     }
 }