This is an example of how to append all elements of a Collection to an ArrayList. We are using the Vector as a Collection implementation. Appending all elements of a Vector to an ArrayList implies that you should:
- Create a new ArrayList.
- Populate the arrayList with elements, using
add(E e)API method of ArrayList. - Create a new Vector.
- Populate the vector with elements, using
add(E e)API method of Vector. - Invoke
addAll(Collection c)API method of ArrayList to append all of the elements of the vector to the end of the arrayList. The elements are in the order that they are returned by the vector’s Iterator.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.ArrayList;
import java.util.Vector;
public class AppendAllElementsOfCollectionToArrayList {
public static void main(String[] args) {
// Create an ArrayList and populate it with elements
ArrayList arrayList = new ArrayList();
arrayList.add("element_1");
arrayList.add("element_2");
arrayList.add("element_3");
// Create another Collection e.g. Vector object and populate it with elements
Vector vector = new Vector();
vector.add("vector_element_1");
vector.add("vector_element_2");
// Append all elements of Vector to ArrayList using the addAll(Collection) operation
arrayList.addAll(vector);
System.out.println("Elements in ArrayList :");
for(int i=0; i < arrayList.size(); i++)
System.out.println(arrayList.get(i));
}
}
Output:
Elements in ArrayList :
element_1
element_2
element_3
vector_element_1
vector_element_2
This was an example of how to append all elements of a Collection to an ArrayList in Java.
