Add NaiveStringMatching activity

Author: jcazevedo

src/main/java/com/packt/datastructuresandalg/lesson5/activity/naivestringmatching/NaiveStringMatching.java

@@ -0,0 +1,7 @@
+package com.packt.datastructuresandalg.lesson5.activity.naivestringmatching;
+
+import java.util.List;
+
+public class NaiveStringMatching {
+    public List<Integer> match(String P, String T) { return null; }
+}

src/main/java/com/packt/datastructuresandalg/lesson5/activity/naivestringmatching/solution/NaiveStringMatching.java

@@ -0,0 +1,31 @@
+package com.packt.datastructuresandalg.lesson5.activity.naivestringmatching.solution;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class NaiveStringMatching {
+    public List<Integer> match(String P, String T) {
+        int n = T.length();
+        int m = P.length();
+        List<Integer> shifts = new ArrayList<>();
+        for (int i = 0; i < n - m + 1; i++) {
+            boolean hasMatch = true;
+            for (int j = 0; j < m; j++) {
+                if (P.charAt(j) != T.charAt(i + j)) {
+                    hasMatch = false;
+                    break;
+                }
+            }
+            if (hasMatch)
+                shifts.add(i);
+        }
+        return shifts;
+    }
+
+    public static void main(String[] args) {
+        NaiveStringMatching nsm = new NaiveStringMatching();
+        List<Integer> matches = nsm.match("aab", "acaabc");
+        for (Integer i : matches)
+            System.out.println(i);
+    }
+}

src/test/java/com/packt/datastructuresandalg/lesson5/activity/naivestringmatching/NaiveStringMatchingTest.java

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+package com.packt.datastructuresandalg.lesson5.activity.naivestringmatching;
+
+import junit.framework.TestCase;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class NaiveStringMatchingTest extends TestCase {
+    NaiveStringMatching nsm = new NaiveStringMatching();
+
+    public void test1() {
+        assertTrue(nsm.match("abc", "abc").equals(Arrays.asList(0)));
+    }
+
+    public void test2() {
+        assertTrue(nsm.match("abd", "abc").equals(new ArrayList<>()));
+    }
+
+    public void test3() {
+        assertTrue(nsm.match("abcde", "abc").equals(new ArrayList<>()));
+    }
+
+    public void test4() {
+        assertTrue(nsm.match("aab", "acaabc").equals(Arrays.asList(2)));
+    }
+
+    public void test5() {
+        assertTrue(nsm.match("aab", "acaabcaab").equals(Arrays.asList(2, 6)));
+    }
+}