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Java Program to Split a list into Two Halves
In this article, we will understand how to split a list into two halves. A list is an ordered collection that allows us to store and access elements sequentially. It contains the index-based methods to insert, update, delete and search the elements. It can also have duplicate elements.
Below is a demonstration of the same −
Suppose our input is −
Input list :[Java, Python, JavaScript, Shell, Scala]
The desired output would be −
The first half of the list is: [Java, Python] The second half of the list is: [JavaScript, Shell, Scala]
Algorithm
Step 1 - START Step 2 - Declare three array list namely input_list, first_list, second_list. Step 3 - Define the values. Step 4 - Get the size of the array using the function .size(). Step 5 - Iterate the input_list using a for-loop, add all the elements with index lesser the size/2 index value to the first_list and add all the elements with index greater the size/2 index value to the second_list using the .add() function. Step 6 - Display the result Step 7 - Stop
Example 1
Here, we bind all the operations together under the ‘main’ function.
import java.util.ArrayList;
import java.util.List;
public class Demo {
public static void main(String[] args) {
System.out.println("Required packages have been imported");
List<String> input_list = new ArrayList<String>();
input_list.add("Java");
input_list.add("Python");
input_list.add("JavaScript");
input_list.add("Shell");
input_list.add("Scala");
System.out.println("The list is defined as " +input_list);
List<String> first_list = new ArrayList<String>();
List<String> second_list = new ArrayList<String>();
int size = input_list.size();
System.out.println("\nThe first half of the list is: ");
for (int i = 0; i < size / 2; i++)
first_list.add(input_list.get(i));
System.out.println(first_list);
System.out.println("The second half of the list is: ");
for (int i = size / 2; i < size; i++)
second_list.add(input_list.get(i));
System.out.println(second_list);
}
}Output
Required packages have been imported The list is defined as [Java, Python, JavaScript, Shell, Scala] The first half of the list is: [Java, Python] The second half of the list is: [JavaScript, Shell, Scala]
Example 2
Here, we encapsulate the operations into functions exhibiting object-oriented programming.
import java.util.ArrayList;
import java.util.List;
public class Demo {
static void split_list(List<String> input_list) {
List<String> first_list = new ArrayList<String>();
List<String> second_list = new ArrayList<String>();
int size = input_list.size();
System.out.println("\nThe first half of the list is: ");
for (int i = 0; i < size / 2; i++)
first_list.add(input_list.get(i));
System.out.println(first_list);
System.out.println("The second half of the list is: ");
for (int i = size / 2; i < size; i++)
second_list.add(input_list.get(i));
System.out.println(second_list);
}
public static void main(String[] args) {
System.out.println("Required packages have been imported");
List<String> input_list = new ArrayList<String>();
input_list.add("Java");
input_list.add("Python");
input_list.add("JavaScript");
input_list.add("Shell");
input_list.add("Scala");
System.out.println("The list is defined as " +input_list);
split_list(input_list);
}
}Output
Required packages have been imported The list is defined as [Java, Python, JavaScript, Shell, Scala] The first half of the list is: [Java, Python] The second half of the list is: [JavaScript, Shell, Scala]
Updated on: 29-Mar-2022
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