Added Java prompts

java/ArrayDemo.java

@@ -0,0 +1,20 @@
+package java;
+
+public class ArrayDemo{
+
+    // create a function to find the maximum element in an array
+
+    // create a function that takes in an array of numbers and returns the sum of all the odd numbers.
+
+    // create a function to add elements of two arrays
+
+
+    // create a main method
+    public static void main(String[] args){
+        // create an array
+
+        // print the array
+
+    }
+
+}

java/StringDemo.java

@@ -0,0 +1,19 @@
+package java;
+
+public class StringDemo {
+
+    // create a function to reverse a string
+
+    // create a function to check whether a string is palindrome or not
+
+    // create a function to convert lowercase to uppercase and vice versa
+
+
+    // create a main method
+    public static void main(String[] args) {   
+        // create a string
+
+    }
+
+
+}