Adicionando codigo para as atividades de hoje

src/algoritmos/MergeSort.java

@@ -2,7 +2,7 @@
 
 import java.io.IOException;
 
-public class Mergesort {
+public class MergeSort {
 
 	public static void main(String[] args) throws IOException {
 		int quantidade = 10000;

src/exemplos/Main.java

@@ -0,0 +1,52 @@
+package exemplos;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class Main {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		f(10);
+		readFile("");
+		validarString("omnilink");
+	}
+
+	public static long f(int n) {
+        int x;
+		if (n < 2) {
+            return n;
+        } else {
+            return f(n - 1) + f(n - 2);
+        }
+    }
+
+	public static String readFile(String fileName){ 
+	    BufferedReader br; 
+	    try { 
+	        br = new BufferedReader(new FileReader(fileName)); 
+	        final StringBuilder sb = new StringBuilder(); 
+	        String line = br.readLine(); 
+
+	        while (line != null) { 
+	            sb.append(line); 
+	            sb.append(System.lineSeparator()); 
+	            line = br.readLine(); 
+	        } 
+	        br.close(); 
+	        return sb.toString(); 
+	    } catch (IOException e) { 
+	        e.printStackTrace(); 
+	    } 
+	    return ""; 
+	}
+
+	public static boolean validarString(String entrada) {
+		if (entrada != null && !entrada.equals("") && entrada.length() > 3) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+}