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Java Program to Convert the ArrayList into a string and vice versa
In this article, we will understand how to convert the arrayList into a string and vice versa. The ArrayList class is a resizable array, which can be found in the java. util package. The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified.
Below is a demonstration of the same −
Suppose our input is −
Input string: Java Program
The desired output would be −
The array after conversion from string is: J a v a P r o g r a m
Algorithm
Step 1 - START Step 2 - Declare namely Step 3 - Define the values. Step 4 - Create an array and add elements to it using the ‘add’ method. Step 5 - Display the list on the console. Step 6 - Create another empty array of previous array size. Step 7 - Convert it into string using the ‘toString’ method. Step 8 - Iterate over the elements and display the elements on the console. Step 9 - Stop
Example 1
import java.util.ArrayList;
public class Demo {
public static void main(String[] args) {
System.out.println("The required packages have been imported");
ArrayList input_array= new ArrayList<>();
input_array.add("Java");
input_array.add("Python");
input_array.add("Scala");
input_array.add("JavaScript");
System.out.println("The array is defined as: " + input_array);
String result_string = input_array.toString();
System.out.println("\nThe result string is: " + result_string);
}
}Output
The required packages have been imported The array is defined as: [Java, Python, Scala, JavaScript] The result string is: [Java, Python, Scala, JavaScript]
Example 2
Here, we convert a string to an array.
public class Demo {
public static void main(String args[]){
String input_string = "Java Program";
System.out.println("The string is defined as: " + input_string);
char[] result_array = new char[input_string.length()];
for (int i = 0; i < input_string.length(); i++) {
result_array[i] = input_string.charAt(i);
}
System.out.println("The array after conversion from string is: " );
for (char c : result_array) {
System.out.print(c + " ");
}
}
}Output
The string is defined as: Java Program The array after conversion from string is: J a v a P r o g r a m
Updated on: 30-Mar-2022
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