How to add all items in a String array to a vector in Java ?

Question

My code looks like this :

Vector<String> My_Vector=new Vector<String>();
String My_Array[]=new String[100];

for (int i=0;i<100;i++) My_Array[i]="Item_"+i;
......
My_Vector.addAll(My_Array);

But I got an error message, what's the right way to do it, without looping to add each item ?

Frank

Answer 1

My_Vector.addAll(Arrays.asList(My_Array));

If you notice, Collection.addAll takes a Collection argument. A Java array is not a Collection, but Arrays.asList, in combination with Collection.toArray, is the "bridge between array-based and collection-based APIs".

Alternatively, for the specific purpose of adding elements from an array to a Collection, you can also use the static helper method addAll from the Collections class.

Collections.addAll(My_Vector, My_Array);

Answer 2

Collections.addAll(myVector, myArray);

This is the preferred way to add the contents of an array into a collection (such as a vector).

Answer 3

Hi, The vector.addAll()takes a Collection in parameter. In order to convert array to Collection, you can use Arrays.asList():

My_Vector.addAll(Arrays.asList(My_Array));