Added Linear Search in Java

HelloWorld_LinearSearch.java

@@ -0,0 +1,44 @@
+import java.util.*;
+
+public class HelloWorld_LinearSearch {
+    private static final String ERROR_STRING = "Please provide a list of characters (\"'h','e','l','l','o'\") and the character to find ('l')";
+    public static void main(String[] args) {
+        try {
+            // Returns TRUE
+            List<Character> listOfNumbers = new ArrayList<Character>(Arrays.asList('h','e','l','l','o','w','o','r','l','d'));
+            Character keyToSearch = 'r';
+            InputOutputMethod(listOfNumbers, keyToSearch);
+
+            // Returns FALSE
+            keyToSearch = 'a';
+            InputOutputMethod(listOfNumbers, keyToSearch);
+
+            // Gives error as no input
+            listOfNumbers = new ArrayList<Character>(Arrays.asList());
+            InputOutputMethod(listOfNumbers, keyToSearch);
+        }
+        catch(Exception e) {
+            System.out.println(ERROR_STRING);
+        }
+    }
+
+    private static void InputOutputMethod(List<Character> listOfNumbers, Character keyToSearch) {
+        if(listOfNumbers.size() >= 1){
+            Boolean searched = linearSearch(listOfNumbers, keyToSearch);
+            System.out.println(searched);
+        }else{
+            System.out.println(ERROR_STRING);
+        }
+    }
+
+    private static Boolean linearSearch(List<Character> list, Character keyToSearch) {
+        Boolean answer = false;
+        for (Character number : list) {
+            if(number == keyToSearch) {
+                answer = true;
+                break;
+            }
+        }
+        return answer;
+    }
+}