Add LinkedList in java blog examples

Author: gauravkukade

collections/linkedlist/LinkedAllowDuplicates.java

@@ -0,0 +1,25 @@
+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+/**
+ * A Java program to prove that LinkedList Allows null values
+ * @author coderolls.com
+ *
+ */
+public class LinkedAllowDuplicates {
+
+	public static void main(String[] args) {
+
+		LinkedList<String> linkedList = new LinkedList<String>();
+		linkedList.add("John");
+		linkedList.add(null);
+		linkedList.add("Mark");
+		linkedList.add(null);
+		linkedList.add("Ruby");
+		linkedList.add("Lucy");
+		linkedList.add("Vikram");
+		linkedList.add(null);
+		
+		System.out.println(linkedList);
+	}
+}

collections/linkedlist/LinkedAllowNull.java

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+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+/**
+ * A Java program to prove that LinkedList Allows Duplicates
+ * @author coderolls.com
+ *
+ */
+public class LinkedAllowNull {
+
+	public static void main(String[] args) {
+
+		LinkedList<String> linkedList = new LinkedList<String>();
+		linkedList.add("John");
+		linkedList.add("Mark");
+		linkedList.add("Mark");
+		linkedList.add("Mark");
+		linkedList.add("Ruby");
+		linkedList.add("Lucy");
+		linkedList.add("Vikram");
+		linkedList.add("Vikram");
+		
+		System.out.println(linkedList);
+	}
+}

collections/linkedlist/LinkedListInsertionOrder.java

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+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+/**
+ * A Java program to prove that LinkedList maintains insertion order
+ * @author coderolls.com
+ *
+ */
+public class LinkedListInsertionOrder {
+
+	public static void main(String[] args) {
+
+		LinkedList<String> linkedList = new LinkedList<String>();
+		linkedList.add("John");
+		linkedList.add("Mark");
+		linkedList.add("Ruby");
+		linkedList.add("Lucy");
+		linkedList.add("Vikram");
+		
+		System.out.println(linkedList);
+	}
+}