Add iterate linkedlist example

Author: gauravkukade

collections/linkedlist/iterate-linkedlist-in-java/LinkedListForEachMethod.java

@@ -0,0 +1,30 @@
+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * A java program to iterate over linkedList
+ * using the java 8 foreach method.
+ * 
+ * @author coderolls.com
+ */
+public class LinkedListForEachMethod {
+
+	public static void main(String[] args) {
+
+		List<String> linkedList = new LinkedList<String>();
+
+		linkedList.add("Mango");
+		linkedList.add("Banana");
+		linkedList.add("Grapes");
+		linkedList.add("Watermelon");
+		linkedList.add("Apple");
+		linkedList.add("Avocado");
+
+		System.out.println("Iterating through LinkedList using forEach method and lamda expression........\n");
+
+		// add lambda expression in the foreach method
+		linkedList.forEach(s -> System.out.println("Object form the LinkedList is " + s));
+	}
+}

collections/linkedlist/iterate-linkedlist-in-java/LinkedListForLoop.java

@@ -0,0 +1,38 @@
+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * A java program to iterate over linkedList
+ * using the basic for loop.
+ * 
+ * @author coderolls.com
+ *
+ */
+public class LinkedListForLoop {
+
+	public static void main(String[] args) {
+
+		List<String> linkedList = new LinkedList<String>();
+
+		linkedList.add("Mango");
+		linkedList.add("Banana");
+		linkedList.add("Grapes");
+		linkedList.add("Watermelon");
+		linkedList.add("Apple");
+		linkedList.add("Avocado");
+
+		System.out.println("Iterating through LinkedList using the basic for loop!\n");
+		
+		int len = linkedList.size();
+		
+		// iterate over linkedList using basic for loop
+		for (int i = 0; i < len; i++) {
+			
+			// get String object from linkedList at index i
+			String str = linkedList.get(i);
+			System.out.println("Object form the LinkedList at " + i + " is " + str);
+		}
+	}
+}

collections/linkedlist/iterate-linkedlist-in-java/LinkedListForeachLoop.java

@@ -0,0 +1,33 @@
+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * A java program to iterate over linkedList
+ * using the foreach loop.
+ * 
+ * @author coderolls.com
+ *
+ */
+public class LinkedListForeachLoop {
+
+	public static void main(String[] args) {
+
+		List<String> linkedList = new LinkedList<String>();
+
+		linkedList.add("Mango");
+		linkedList.add("Banana");
+		linkedList.add("Grapes");
+		linkedList.add("Watermelon");
+		linkedList.add("Apple");
+		linkedList.add("Avocado");
+
+		System.out.println("Iterating through LinkedList using the foreach loop!\n");
+		
+		// iterate over linkedList using foreach loop
+		for (String str: linkedList) {
+			System.out.println("Object form the LinkedList is "+str);
+		}
+	}
+}

collections/linkedlist/iterate-linkedlist-in-java/LinkedListIterator.java

@@ -0,0 +1,37 @@
+package com.gaurav.ExProject.LinkedList;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * A java program to iterate through LinkedList using Iterator interface.
+ * 
+ * @author coderolls.com
+ *
+ */
+public class LinkedListIterator {
+
+	public static void main(String[] args) {
+		List<String> linkedList = new LinkedList<String>();
+
+		linkedList.add("Mango");
+		linkedList.add("Banana");
+		linkedList.add("Grapes");
+		linkedList.add("Watermelon");
+		linkedList.add("Apple");
+		linkedList.add("Avocado");
+		System.out.println("Iterating through LinkedList using Iterator interface........\n");
+
+		// getting iterator
+		Iterator<String> iterator = linkedList.iterator();
+
+		// hasNext() returns true only if object is available at next call
+		while (iterator.hasNext()) {
+
+			// next() returns obejct, we can cast it to reuqired type
+			String str = iterator.next();
+			System.out.println("Object form the LinkedList is " + str);
+		}
+	}
+}

collections/linkedlist/iterate-linkedlist-in-java/LinkedListWhileLoop.java

@@ -0,0 +1,44 @@
+package com.gaurav.ExProject.LinkedList;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * A java program to iterate over linkedList
+ * using the while loop.
+ * 
+ * @author coderolls.com
+ *
+ */
+public class LinkedListWhileLoop {
+
+	public static void main(String[] args) {
+
+		List<String> linkedList = new LinkedList<String>();
+
+		linkedList.add("Mango");
+		linkedList.add("Banana");
+		linkedList.add("Grapes");
+		linkedList.add("Watermelon");
+		linkedList.add("Apple");
+		linkedList.add("Avocado");
+
+		System.out.println("Iterating through LinkedList using the while loop!\n");
+		
+		int len = linkedList.size();
+		
+		// iterate over linkedList using while loop
+		int i =0;
+		
+		while(i<len) {
+			
+			// get String object from linkedList at index i
+			String str = linkedList.get(i);
+			
+			System.out.println("Object form the LinkedList is "+str);
+			
+			//increment index after getting the object
+			i++;
+		}
+	}
+}