Converting Collection to an Array
Here is the illustration for the conversion from the
collection to an array. In this section, you will learn how to do this. The given example gives you a brief introduction for convert
collection to an array without losing any data or element present in the
collection.
This program creates a List. List is a type of
collection that contains a ordered list of elements. This list (collection) is
converted into an array. Length of the created array is defined by the system
according to the number of elements in the list. Each and every subscripts hold
separate element.
Code Description:
Here is the explanation of some methods and APIs
whatever has been used in the program:
List:
List is the class of the java.util
package which creates a list for
containing some elements. In this program, this class is used with the type
checking.
add():
Above method adds elements to the list. This method holds string which is
the element name.
List.toArray(new String[0]):
Above code converts a list into a String Array. This method returns a string
array which length is fixed according to the number of elements present in the
list. Overall this code converts collection to an array.
Here is the code of the program:
import java.util.*;
public class CollectionToArray{
public static void main(String[] args){
List<String> list = new ArrayList<String>();
list.add("This ");
list.add("is ");
list.add("a ");
list.add("good ");
list.add("boy.");
String[] s1 = list.toArray(new String[0]); //Collection to array
for(int i = 0; i < s1.length; ++i){
String contents = s1[i];
System.out.print(contents);
}
}
}
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