hakaneroztekin

class Employee{  
  int id;  
  String name;  
  Address address; // <- aggregation here (Address is a class)  
  // ...  
}  

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@FunctionalInterface
public interface MyFirstFunctionalInterface {
    public void firstWork();
}

hakaneroztekin

// Java program to demonstrate lambda expressions 
// to implement a user defined functional interface. 
// A sample functional interface (An interface with single abstract method) 
interface FuncInterface 
{ 
    // An abstract function 
    void abstractFun(int x); 
  
    // A non-abstract (or default) function (Java 8 feature)
    default void normalFun() 

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// Moveable interface defines a method move() 
// and provided a default implementation as well. 
// If any class implements this interface then it 
// need not to implement it’s own version of move() method. 
// It can directly call instance.move(). e.g.
public interface Moveable {
    default void move(){
        System.out.println("I am moving");
    }
}

hakaneroztekin

// List Interface
// We can store the ordered collection of objects. It can have duplicate values.
List <data-type> list1= new ArrayList();  
List <data-type> list2 = new LinkedList();  
List <data-type> list3 = new Vector();  
List <data-type> list4 = new Stack();  

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// ArrayList
import java.util.*;  
class TestJavaCollection1{  
  public static void main(String args[]){  
    ArrayList<String> list=new ArrayList<String>();//Creating arraylist  
    list.add("Ravi");//Adding object in arraylist  
    list.add("Vijay");  
    list.add("Ravi");  
    list.add("Ajay");  
    // Traversing list through Iterator  

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//LinkedList
import java.util.*;  
public class TestJavaCollection2{  
  public static void main(String args[]){  
    LinkedList<String> al=new LinkedList<String>();  
    al.add("Ravi");  
    al.add("Vijay");  
    al.add("Ravi");  
    al.add("Ajay");  
    Iterator<String> itr=al.iterator();  

hakaneroztekin

// Stack
import java.util.*;  
public class TestJavaCollection4{  
  public static void main(String args[]){  
    Stack<String> stack = new Stack<String>();  
    stack.push("Ayush");  
    stack.push("Garvit");  
    stack.push("Amit");  
    stack.push("Ashish");  
    stack.push("Garima");  

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// PriorityQueue
import java.util.*;  
public class TestJavaCollection5{  
  public static void main(String args[]){  
    PriorityQueue<String> queue=new PriorityQueue<String>();  
    queue.add("Amit Sharma");  
    queue.add("Vijay Raj");  
    queue.add("JaiShankar");  
    queue.add("Raj");  
    System.out.println("head:"+queue.element());  

hakaneroztekin

// Array Deque
import java.util.*;  
public class TestJavaCollection6{  
  public static void main(String[] args) {  
    //Creating Deque and adding elements  
    Deque<String> deque = new ArrayDeque<String>();  
    deque.add("Gautam");  
    deque.add("Karan");  
    deque.add("Ajay");  
    //Traversing elements