Linear Search in a 2D array using Java

By
Shivam Gupta
-
26
Linear Search in a 2D array using Java
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Linear Search in a 2D array using Java

Searching for an element in a two-dimensional (2D) array adds an extra layer of complexity to the classic Linear Search algorithm. In this blog post, we’ll explore the step-by-step implementation of Linear Search in a 2D array using Java, unravelling the intricacies of this fundamental algorithm when applied to multi-dimensional data structures.

Understanding 2D Array Linear Search:

A 2D array introduces rows and columns, and searching for an element involves traversing through both dimensions to find the target value. Searching linearly in a 2D array entails sequentially checking each element until finding the desired element or exploring the entire array.

Java Implementation:

Consider the following Java program implementing Linear Search in a 2D array:

Java
public class LinearSearch2D {
    // Method to perform Linear Search in a 2D array
    public static int[] linearSearch2D(int[][] array, int target) {
      // Loop through rows
        for (int i = 0; i < array.length; i++) { 
        // Loop through columns in each row
            for (int j = 0; j < array[i].length; j++) { 
                if (array[i][j] == target) {
                // Return indices if the target element is found
                    return new int[]{i, j}; 
                }
            }
        }
        // Return {-1, -1} if the target element is not found in the 2D array
        return new int[]{-1, -1}; 
    }

    // Main method for testing the Linear Search in 2D array
    public static void main(String[] args) {
        // Example 2D array
        int[][] array2D = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };
        int targetElement = 6; // Target element for demonstration

        // Perform Linear Search and store the result in the 'result' array
        int[] result = linearSearch2D(array2D, targetElement);

        // Check if the target element was found and print the result accordingly
        if (result[0] != -1) {
            System.out.println("Element " + targetElement + " found at position: (" + result[0] + ", " + result[1] + ")");
        } else {
            System.out.println("Element " + targetElement + " not found in the 2D array");
        }
    }
}

Breaking Down the Implementation:

Let’s break down the Java program that implements Linear Search in a 2D array:

1. linearSearch2D Method:

  • This method takes a 2D array (array) and a target element (target) as parameters.
  • It uses nested loops to traverse through each element in the 2D array.
  • If the target element is found, it returns an array containing the indices of the element (new int[]{i, j}).
  • In case the algorithm doesn’t find the target element, it returns {-1, -1}.

2. Main Method:

  • In the main method, a 2D array (array2D) is declared and initialized.
  • The target element (targetElement) is set to 6 for demonstration purposes.
  • The linearSearch2D method is called with the 2D array and the target element, and the result is stored in the result array.
  • The program then checks if the first index of the result is not -1. If the condition is true, the program prints the position where it found the element. If false, it prints a message indicating the element’s absence in the 2D array.

3. Execution:

  • In this example, the 2D array reveals that it found the target element 6 at position (1, 2).
  • The program prints: “Element 6 found at position: (1, 2)”.

This program demonstrates how to adapt Linear Search for use in a 2D array, revealing the indices of the target element upon discovery.

Output:

Java
Element 6 found at position: (1, 2)

Key Takeaways:

  • Linear Search in a 2D array involves nested loops to traverse rows and columns.
  • The algorithm sequentially checks each element until it finds a match or traverses the entire 2D array.
  • The Java implementation showcases how to adapt Linear Search for multi-dimensional arrays.

Wanted to lean more please follow the directory: Array

In conclusion, understanding Linear Search in a 2D array in Java provides valuable insights into navigating multi-dimensional data structures. Experiment with different 2D arrays and target elements to solidify your grasp of this essential algorithm. Happy coding!

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