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Java Program to Replace Elements in a List
In this article, we will understand how to replace elements in a list. The List extends Collection and declares the behavior of a collection that stores a sequence of elements.
The Collection is a framework that provides architecture to store and manipulate the group of objects. Java Collections can achieve all the operations that you perform on a data such as searching, sorting, insertion, manipulation, and deletion.
Below is a demonstration of the same −
Suppose our input is −
Input list : [Java, Scala, Mysql, Redshift]
The desired output would be −
After replacing one element of the list: [Java, Scala, Python, Redshift]
Algorithm
Step 1 - START Step 2 - Declare a list namely input_list. Step 3 - Define the values. Step 4 - Use the function .set() and pass the index to be updated and the string to be added as parameter. Step 5 - Display the list as result Step 6 - Stop
Example 1
Here, we bind all the operations together under the ‘main’ function.
import java.util.*;
public class Demo {
public static void main(String[] args) {
System.out.println("The required packages have been imported");
try {
ArrayList<String> input_list = new ArrayList<>();
input_list.add("Java");
input_list.add("Scala");
input_list.add("Mysql");
input_list.add("Redshift");
System.out.println("The list is defined as" +input_list);
input_list.set(2, "Python");
System.out.println("\nAfter replacing one element of the list: " +input_list);
}
catch (Exception e) {
System.out.println(e);
}
}
}Output
The required packages have been imported The list is defined as[Java, Scala, Mysql, Redshift] After replacing one element of the list: [Java, Scala, Python, Redshift]
Example 2
Here, we encapsulate the operations into functions exhibiting object oriented programming.
import java.util.*;
public class Demo {
static void replace(List<String> input_list, String input_string){
input_list.set(2, input_string);
System.out.println("\nAfter replacing one element of the list: " +input_list);
}
public static void main(String[] args) {
System.out.println("The required packages have been imported");
try {
ArrayList<String> input_list = new ArrayList<>();
input_list.add("Java");
input_list.add("Scala");
input_list.add("Mysql");
input_list.add("Redshift");
System.out.println("The list is defined as" +input_list);
String input_string = "Python";
replace(input_list, input_string);
}
catch (Exception e) {
System.out.println(e);
}
}
}Output
The required packages have been imported The list is defined as[Java, Scala, Mysql, Redshift] After replacing one element of the list: [Java, Scala, Python, Redshift]
Updated on: 30-Mar-2022
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