APL2.1 - Controle Machine & DEV 2.3

DEV 2.3/Largest/Largest.java

@@ -0,0 +1,19 @@
+import java.util.Objects;
+
+public class Largest {
+    
+    /**
+    * Return the largest element in a list.
+    *
+    * @param list A list of integers
+    * @return The largest number in the given list
+    */
+    public static int largest(int[] list) {
+        Objects.requireNonNull(list);
+        int index, max=Integer.MIN_VALUE;
+        for (index = 0; index < list.length; index++) {
+            max = list[index] > max ? list[index] : max;
+        }
+        return max;
+    }
+  }

DEV 2.3/Largest/TestLargest.java

@@ -0,0 +1,36 @@
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+ 
+public class TestLargest {
+ 
+    @Test
+    public void testSimple() {
+        assertEquals(9, Largest.largest(new int[] {9,8,7}));
+    }
+
+    @Test
+    public void testBoundary() {
+        assertEquals(Integer.MAX_VALUE, Largest.largest(new int[] {1, 28825, Integer.MAX_VALUE}));
+    }
+
+    @Test
+    public void testInverse() {
+        assert(3 != Largest.largest(new int[] {1, 3, 7}));
+    }
+
+    @Test
+    public void testCrosscheck() {
+        int[] a = new int[] {3, 1, 7};
+        Arrays.sort(a);
+        assert(Largest.largest(new int[] {3, 1, 7}) == a[a.length-1]);
+    }
+
+    @Test
+    public void testError() {
+        Largest.largest(new int[] {});
+        Largest.largest(null);
+    }
+}