Added 25 solutions

Java/Object Oriented Programming/Java Inheritance I/Solution.java

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+//     Author: Rodney Shaghoulian
+//     Github: github.com/rshaghoulian
+// HackerRank: hackerrank.com/rshaghoulian
+
+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.math.*;
+import java.util.regex.*;
+
+class Animal {
+    void walk() {
+        System.out.println("I am walking");
+    }
+}
+
+class Bird extends Animal {
+    void fly() {
+        System.out.println("I am flying");
+    }
+    void sing() {
+        System.out.println("I am singing");
+    }
+}
+
+public class Solution {
+   public static void main(String args[]) {
+      Bird bird = new Bird();
+      bird.walk();
+      bird.fly();
+      bird.sing();
+   }
+}