List Interface in Java.java

 
import java.util.*; 

// Main class 
// ListDemo class 
class GFG { 

	// Main driver method 
	public static void main(String[] args) 
	{ 

		// Creating an object of List interface 
		// implemented by the ArrayList class 
		List<Integer> l1 = new ArrayList<Integer>(); 

		// Adding elements to object of List interface 
		// Custom inputs 

		l1.add(0, 1); 
		l1.add(1, 2); 

		// Print the elements inside the object 
		System.out.println(l1); 

		// Now creating another object of the List 
		// interface implemented ArrayList class 
		// Declaring object of integer type 
		List<Integer> l2 = new ArrayList<Integer>(); 

		// Again adding elements to object of List interface 
		// Custom inputs 
		l2.add(1); 
		l2.add(2); 
		l2.add(3); 

		// Will add list l2 from 1 index 
		l1.addAll(1, l2); 

		System.out.println(l1); 

		// Removes element from index 1 
		l1.remove(1); 

		// Printing the updated List 1 
		System.out.println(l1); 

		// Prints element at index 3 in list 1 
		// using get() method 
		System.out.println(l1.get(3)); 

		// Replace 0th element with 5 
		// in List 1 
		l1.set(0, 5); 

		// Again printing the updated List 1 
		System.out.println(l1); 
	} 
}