Use of copyOf() syntax in Java || How to use copyOf() method in Java

Using copyOf() method:

Syntax:

Object[] gfg= a1.toArray()
String[] str = Arrays.copyOf(gfg, 
                             gfg.length, 
                             String[].class);

Approach:

1. Get the ArrayList of String.
2. Convert ArrayList to Object array using toArray() method.
3. Convert it to String Array using Arrays.copyOf() method.
4. Print String Array.

// Java program to Convert ArrayList to 

// String ArrayList using get() method 

import java.util.*; 

public class GFG { 

// Function to convert ArrayList<String> to String[] 

public static String[] GetStringArray(ArrayList<String> arr) 

{ 

// Convert ArrayList to object array 

Object[] objArr = arr.toArray(); 

// convert Object array to String array 

String[] str = Arrays 

.copyOf(objArr, objArr 

.length, 

String[].class); 

return str; 

} 

// Driver code 

public static void main(String[] args) 

{ 

// declaration and initialise ArrayList 

ArrayList<String> 

a1 = new ArrayList<String>(); 

a1.add("Geeks"); 

a1.add("for"); 

a1.add("Geeks"); 

// print ArrayList 

System.out.println("ArrayList: " + a1); 

// Get String Array 

String[] str = GetStringArray(a1); 

// Print Array elements 

System.out.print("String Array[]: "

+ Arrays.toString(str)); 

} 

} 

1. Output:
   

   ArrayList: [Geeks, for, Geeks]
   String Array[]: [Geeks, for, Geeks]
   

2.