Java Deque addAll() Method

The addAll() method of Java Deque Interface is used to add all the elements in a specified collection at the end of the deque.

Specified by:

addAll in interface Collection<E>

Syntax:

Parameter:

The above method consists of only one parameter:

The element 'c' that needs to be inserted.

Return:

The above method returns true if the given deque is changed.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeaddAllExample1 {
    public static void main(String[] args) {
	Deque<Integer> deque1 = new ArrayDeque<Integer>();
	System.out.println("The marks for student1 : ");
	deque1.add(28);
	deque1.add(25);
	deque1.add(26);
   for (Integer integer : deque1) {
	System.out.println(integer);
    }
   Deque<Integer> deque2 = new ArrayDeque<Integer>();
    System.out.println("The marks for student2 : ");
	deque2.add(22);
	deque2.add(19);
	deque2.add(20);
  for (Integer integer : deque2) {
	System.out.println(integer);
     }
    deque1.addAll(deque2);
    System.out.println("The total list for the marks : ");
     for (Integer integer : deque1 ) {
		System.out.println(integer);
	}
   }
}

Test it Now

Output:

The marks for student1 : 
28
25
26
The marks for student2 : 
22
19
20
The total list for the marks : 
28
25
26
22
19
20

Example 2

import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Scanner;
public class JavaDequeaddAllExample2 {
   public static void main(String[] args) {
	Scanner scanner = new Scanner(System.in);
	Deque<String> deque = new ArrayDeque<String>();
	System.out.println("Enter the name of Employees for List 1: ");
    for (int i = 0; i < 4; i++) {
    	String name = scanner.next();
      deque.add(name);	
	}
    Deque<String> deque1 = new ArrayDeque<String>();
    System.out.println("Enter the name of Employees for List 2: ");
    for (int i = 0; i < 4; i++) {
    	String name = scanner.next();
      deque1.add(name);	
	}
     deque.addAll(deque1);
    System.out.println("The final list for the employees is given as : ");     
     for (String string : deque) {
		System.out.println(string);
	}
   }
}

Output:

Enter the name of Employees for List 1: 
Sam
Ram 
Priya
Urvashi
Enter the name of Employees for List 2: 
Ravi
Rita 
Yashika
Lavish
The final list for the employees is given as : 
Sam
Ram
Priya
Urvashi
Ravi
Rita
Yashika
Lavish

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