addAll(index) Method : Java.util.ArrayList

Declaration :

public boolean addAll(int index, Collection<? extends E> c)

1	public boolean addAll(int index, Collection<? extends E> c)

Explanation :

Purpose	Method inserts the specified element E at the specified position in this list.
Parameters	index ==> Index at which to insert the first element from the specified collection
	c ==> Collection containing elements to be added to this list
Return Value	True if this list changed after calling method
Exception	NullPointerException ==> If the specified collection is null
	IndexOutOfBoundsException ==> If the index is out of range

Example

The following example shows the usage of java.util.Arraylist.addall(index, c) method.

package com.c4learn.arraylist;
import java.util.ArrayList;
public class ArrayListExamples {
  public static void main(String args[]) {
    // Create ArrayList 1
    ArrayList<String> arrlist1 = new ArrayList<String>(5);
    // Fill Elements in ArrayList 1
    arrlist1.add("A");
    arrlist1.add("B");
    arrlist1.add("C");
    // Print Elements in ArrayList 1
    System.out.println("ArrayList 1 : ");
    for (String ele : arrlist1) {
      System.out.println("Element : " + ele);
    }
    // Create ArrayList 2
    ArrayList<String> arrlist2 = new ArrayList<String>(5);
    // Fill Elements in ArrayList 2
    arrlist2.add("D");
    arrlist2.add("E");
    arrlist2.add("F");
    // Print Elements in ArrayList 2
    System.out.println("ArrayList 2 : ");
    for (String ele : arrlist2) {
      System.out.println("Element : " + ele);
    }
    // Insert all elements of List2 to List1 at 0th position
    arrlist1.addAll(0,arrlist2);
    System.out.println("List1 + List 2 :");
    for (String ele : arrlist1) {
      System.out.println("Element : " + ele);
    }
  }
}

package com.c4learn.arraylist;

import java.util.ArrayList;

public class ArrayListExamples {

public static void main(String args[]) {

// Create ArrayList 1

ArrayList<String> arrlist1 = new ArrayList<String>(5);

// Fill Elements in ArrayList 1

arrlist1.add("A");

arrlist1.add("B");

arrlist1.add("C");

// Print Elements in ArrayList 1

System.out.println("ArrayList 1 : ");

for (String ele : arrlist1) {

System.out.println("Element : " + ele);

}

// Create ArrayList 2

ArrayList<String> arrlist2 = new ArrayList<String>(5);

// Fill Elements in ArrayList 2

arrlist2.add("D");

arrlist2.add("E");

arrlist2.add("F");

// Print Elements in ArrayList 2

System.out.println("ArrayList 2 : ");

for (String ele : arrlist2) {

System.out.println("Element : " + ele);

}

// Insert all elements of List2 to List1 at 0th position

arrlist1.addAll(0,arrlist2);

System.out.println("List1 + List 2 :");

for (String ele : arrlist1) {

System.out.println("Element : " + ele);

}

Output :

ArrayList 1 : 
Element : A
Element : B
Element : C
ArrayList 2 : 
Element : D
Element : E
Element : F
List1 + List 2 :
Element : D
Element : E
Element : F
Element : A
Element : B
Element : C

ArrayList 1 :

Element : A

Element : B

Element : C

ArrayList 2 :

Element : D

Element : E

Element : F

List1 + List 2 :

Element : D

Element : E

Element : F

Element : A

Element : B

Element : C