ArrayList toArray() method in Java with Examples
The toArray() method of ArrayList is used to return an array containing all the elements in ArrayList in the correct order.
Declaring toArray() method
public Object[] toArray()
or
public <T> T[] toArray(T[] a)
Parameters: This method either accepts no parameters or it takes an array T[] as a parameter which is the array into which the elements of the list are to be stored if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
Return Value: The function returns an array containing all the elements in this list.
Exception: The first overload of this method throws no exceptions. However, the second overload throws the following exceptions:
- ArrayStoreException: if the runtime type of the specified array is not a supertype of the runtime type of every element in this list.
- NullPointerException if the specified array is null
Examples of Java ArrayList.toArray() method
Example 1
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
{
ArrayList<Integer> ArrLis
= new ArrayList<Integer>();
ArrLis.add( 32 );
ArrLis.add( 67 );
ArrLis.add( 98 );
ArrLis.add( 100 );
System.out.println( "ArrayList: " + ArrLis);
Object[] arr = ArrLis.toArray();
System.out.println( "Elements of ArrayList"
+ " as Array: "
+ Arrays.toString(arr));
}
}
|
Output
ArrayList: [32, 67, 98, 100]
Elements of ArrayList as Array: [32, 67, 98, 100]
Example 2
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
{
ArrayList<Integer> ArrLis
= new ArrayList<Integer>();
ArrLis.add( 32 );
ArrLis.add( 67 );
ArrLis.add( 98 );
ArrLis.add( 100 );
System.out.println( " ArrayList: " + ArrLis);
Integer arr[] = new Integer[ArrLis.size()];
arr = ArrLis.toArray(arr);
System.out.println( " Elements of ArrayList "
+ "as Array: "
+ Arrays.toString(arr));
}
}
|
Output
ArrayList: [32, 67, 98, 100]
Elements of ArrayList as Array: [32, 67, 98, 100]
Last Updated :
24 May, 2023
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