Convert string list to array

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Convert string list to array

instantly convert your text list to array; valid for JS, PHP, PERL, PYTHON (as list) and much more. [ your text list here ] Is your list ready? In the need to optimize your list (remove duplicates, empty lines, sort, prefix and suffix, etc.) use KitTxt before. In this java tutorial we are converting a String to an ArrayList. The steps for conversion are as

follows: 1) First split the string using String split() method and assign the substrings into an array of strings. We can split the string based on any character, expression etc. 2) Create an ArrayList and copy the element of string array to newly created ArrayList using Arrays.asList() method. This method returns a list created based on the elements of

the specified array. Program to convert String to ArrayList In this java program we have a string which contains some numbers with delimiter as comma (,). We are splitting the string based on the delimiter and then assigning those numbers to an array of strings. Later we are copying all the elements of string array to an ArrayList using the asList()

method of Arrays. import java.util.ArrayList; import java.util.List; import java.util.Arrays; public class JavaExample { public static void main(String args[]){ String num = "22,33,44,55,66,77"; String str[] = num.split(","); List al = new ArrayList(); al = Arrays.asList(str); for(String s: al){ System.out.println(s); } } } Output: 22 33 44 55 66 77 Note: In

the above example, the delimiter is comma however we can split the string based on any delimiter. For example ? if the string is "hello hi namaste bye" then we can split the string using whitespace as delimiter like this ? Here we have provided whitespace as delimiter String str[] = num.split(" "); Converting between List and Array is a very common

operation in Java. The best and easiest way to convert a List into an Array in Java is to use the .toArray() method. Likewise, we can convert back a List to Array using the Arrays.asList() method. The examples below show how to convert List of String and List of Integers to their Array equivalents. Convert List to Array of Stringimport

java.util.ArrayList; import java.util.List; public class ConvertArrayListToArray { public static void main(String[] args) { List itemList = new ArrayList(); itemList.add("item1"); itemList.add("item2"); itemList.add("item3"); String[] itemsArray = new String[itemList.size()]; itemsArray = itemList.toArray(itemsArray); for(String s : itemsArray)

System.out.println(s); } } We can use the same approach to convert List of Integers to Array of Integers, for example: Related: Convert List to Array of Integersimport java.util.ArrayList; import java.util.List; public class ConvertArrayListToArray { public static void main(String[] args) { List intList = new ArrayList(); intList.add(10); intList.add(20);

intList.add(30); Integer[] intArray = new Integer[intList.size()]; intArray = intList.toArray(intArray); for(Integer i : intArray) System.out.println(i); } } Convert String Array to List You can also convert an Array back to a List. To do this, we use Arrays.asList(). For example:import java.util.ArrayList; import java.util.Arrays; import java.util.List; public

class ConvertArrayToList { public static void main(String[] args) { String[] stringArray = {"item 1", "item 2", "item 3", "item 4"}; List stringList = new ArrayList(Arrays.asList(stringArray)); for (String listItem : stringList) { System.out.println(listItem); } } } Given an ArrayList of String, the task is to convert the ArrayList to String array in

java.Examples: Input: ArrayList = [ "Geeks", "for", "Geeks" ] Output: String[] = {"Geeks", "for", "Geeks"} Input: ArrayList = [ "Jupiter", "Saturn", "Uranus", "Neptune", "Sun"] Output: String[] = {"Jupiter", "Saturn", "Uranus", "Neptune", "Sun"} Using ArrayList.get() MethodSyntax: str[j] = a1.get(j)Approach:Get the ArrayList of Strings.Find the size of

ArrayList using size() method, and Create a String Array of this size.Fetch each element of the ArrayList one by one using get() method.Assigned each element into String Array using assignment(=) operator.Print String Array.Below is the implementation of the above approach:import java.util.*;public class GFG { public static String[]

GetStringArray(ArrayList arr) {

String str[] = new String[arr.size()];

for (int j = 0; j < arr.size(); j++) {

str[j] = arr.get(j);

}

return str; } public static void main(String[] args) {

ArrayList

a1 = new ArrayList();

a1.add("Geeks");

a1.add("for");

a1.add("Geeks");

System.out.println("ArrayList: " +

a1);

String[] str = GetStringArray(a1);

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

+ Arrays.toString(str)); }}Output: ArrayList: [Geeks, for, Geeks] String Array[]: [Geeks, for, Geeks] Using Object array as intermediateSyntax:Object[] arr = a1.toArray() String str = (String)obj; Approach:Get the ArrayList of String.Convert ArrayList to

Object array using toArray() method.Iterate and convert each element to desired type using typecasting. Here it is converted to String type and added to the String Array.Print String Array.Below is the implementation of the above approach:import java.util.*;public class GFG { public static String[] GetStringArray(ArrayList arr) {

String str[]

= new String[arr.size()];

Object[] objArr = arr.toArray();

int i = 0;

for (Object obj : objArr) {

str[i++] = (String)obj;

}

return str; } public static void main(String[] args) {

ArrayList

a1 = new ArrayList();

a1.add("Geeks");

a1.add("for");

a1.add("Geeks");

System.out.println("ArrayList: " +

a1);

String[] str = GetStringArray(a1);

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

+ Arrays.toString(str)); }}Output: ArrayList: [Geeks, for, Geeks] String Array[]: [Geeks, for, Geeks] Using copyOf() method:Syntax:Object[] gfg= a1.toArray() String[] str = Arrays.copyOf(gfg, gfg.length, String[].class); Approach:Get the ArrayList of

String.Convert ArrayList to Object array using toArray() method.Convert it to String Array using Arrays.copyOf() method.Print String Array.Below is the implementation of the above approach:import java.util.*;public class GFG { public static String[] GetStringArray(ArrayList arr) {

Object[] objArr = arr.toArray();

String[] str =

Arrays

.copyOf(objArr, objArr

.length,

String[].class);

return str; } public static void main(String[] args) {

ArrayList

a1 = new ArrayList();

a1.add("Geeks");

a1.add("for");

a1.add("Geeks");

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

String[] str =

GetStringArray(a1);

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

+ Arrays.toString(str)); }}Output: ArrayList: [Geeks, for, Geeks] String Array[]: [Geeks, for, Geeks] Attention reader! Don't stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course

at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.

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