Core Java Tutorial

Introduction of Core Java

How To Install JDk and Set of Path

Syntax of java Program

Difference between Java and C/C++

Advantage and Disadvantage of Java

What is Java

Why Java is not Pure Object Oriented Language

Java has Following Features/Characteristics

Limitation of Java Language and Java Internet

Common Misconception about Java

Simple Program of Java

Integrated Development Environment in java

Compile and Run Java Program

Applet and Comments in Java

Tokens in Java

Keywords in Java

Identifier and Variables in Java

Literals/Constants

Data Type in Java

Assignments and Initialization in Java

Operators in Java

Rule of Precedence in Java

Operator on Integer and Separators in Java Programming

Java Control Flow of Statements

If and If-else Selection Statement

Nested If-else and If-else-If Selection Statement

switch case and conditional operator Selection Statement

for and while Loop

do..while and for each Loop

break and labeled break statement

continue and labeled continue statement

return Statement and exit() Method

Escape Sequence for Special Characters and Unicode Code

Constants and Block or Scope

Statement in Java

Conversions between Numeric Types in Java

Import Statement in Java

User Input in Java using Scanner Class

User Input in Java using Console Class

Array in Java

One Dimensional Array

Two Dimensional Array

Two Dimensional Array Program

Command Line Argument in Java

String args Types in Java

Uneven/Jagged array in java

Math Class Function and Constant

Math Class all Function used in a program

Enumerated Types in Java

Object Oriented Programming v/s Procedural Programming

Object Oriented Programming Concepts in Java

Introduction to Class,Object and Method in Java

Class Declaration in Java

Class & Objects in java

Encapsulation in Java

Modifiers/Visibility for a Class or Interrface or member of a Class

Polymorphism in Java

Runtime polymorphism (dynamic binding or method overriding)

how to iterate over a LinkedList using the Collections API

how to iterate over a LinkedList using the Collections API

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In this example we shall see how can we iterate over a LinkedList using the Iterator.

In this example we have created a class CollectionExample. For using LinkedList we have
to import the java.util package.
 In this example we have used the Iterator interface for iterating through the LinkedList that we have created. For using the iteratror firstly we will invoke the iterator on the LinkedList object, then we iterate through the list by using the next() method on the iterator.

In this example we have created a LinkedList named list and then added some elements to it by using the add() method on the list. Then we have invoked the Iterator on the LinkedList object list and iterate till the iterator see's there is some other element in the list. The following code in the given example invokes the iterator on the list :

ListIterator<Object> ltr=list.listIterator();                
while(ltr.hasNext())
{
System.out.println(ltr.next());
}

 
package r4r.co.in;
import java.util.*;
import java.util.Iterator;
import java.util.List;
import java.util.Collection;


public class CollectionExample {

/**
* @param args
*/
public static void main(String[] args)
{
// TODO Auto-generated method stub


LinkedList<Object> list=new LinkedList<Object>(); // creating a LinkedList of Object type elements
list.add(1); // adding integer values to the LinkedList
list.add(2);
list.add("r4r"); // adding String values to the LinkedList
list.add("shashi");
list.add("s/w engineer");
System.out.println("The contents of the list are as follows: ");
ListIterator<Object> ltr=list.listIterator(); // Invoking the ListIterator on the list for iterating through the list
while(ltr.hasNext())
{
System.out.println(ltr.next()); // displaying the contents of the list
}


}


}
The output will be displayed as:

The contents of the list are as follows:
1
2
r4r
shashi
s/w engineer

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