Java Linear Search with better speed

java-linear-search/JavaLinearSearch1.java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.LinkedList;
+
+/**
+ * Created by SpaceDigi
+ * Implementing Linear Search on java with better performance and testing
+ **/
+
+/**
+ * This class demosntrate working linear search in collection
+ * Using buffered reader for more quick parsing text and LinkedList for using iterators
+ */
+public final class JavaLinearSearch1 {
+
+    private static final String STOP_SIGNAL = "STOP";
+
+    public static void main(String[] args) {
+        BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
+        //change to false for automatic testing
+        boolean manualTest = true;
+        //boolean manualTest = false;
+        try {
+            if(manualTest) {
+                String line = bfr.readLine();
+                LinkedList<Long> list = new LinkedList<>();
+                while (!stop(line)) {
+                    addNumber(line, list);
+                    line = bfr.readLine();
+                }
+                long randomFinder = (long) (Math.random() * Long.MAX_VALUE);
+                System.out.println("Number for found: " + randomFinder + " was found: " + linearSearch(list, randomFinder));
+            }else{
+                LinkedList<Long> list = new LinkedList<>();
+                int numOfTest =5000;
+                for(int k =0;k<numOfTest;k++) {
+                    long valueForAdd = (long) (Math.random() * Long.MAX_VALUE);
+                    list.add(valueForAdd);
+                    System.out.println(valueForAdd);
+                }
+                long randomFinder = (long) (Math.random() * Long.MAX_VALUE);
+                System.out.println("Number for found: " + randomFinder + " was found: " + linearSearch(list, randomFinder));
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static long linearSearch(LinkedList<Long> list, long randomFinder) {
+        for(long value: list)
+            if(value==randomFinder)
+                return randomFinder;
+        return -1;
+    }
+
+    private static void addNumber(String line, LinkedList<Long> list) {
+        try {
+            long value = Long.parseLong(line.trim());
+            list.add(value);
+        } catch (NumberFormatException e) {
+            //User value isn't correct
+        }
+    }
+
+    private static boolean stop(String line) {
+        return line == null ||line.equals("")|| line.contains(STOP_SIGNAL);
+    }
+}