How to implement linear search algorithm using java

How to use Java to implement linear search algorithm

Linear Search algorithm (Linear Search) is a simple but commonly used search algorithm. Its basic idea is to compare the element to be found with the elements in the list one by one. When a matching element is found, the index position of the element is returned. If no matching element is found, -1 is returned.

The following takes the Java language as an example to introduce you in detail how to use Java to implement the linear search algorithm.

Step 1: Create a list to store the elements to be found

The first step is to create a list to store the elements to be found. Here we use an array in Java to implement it.

int[] arr = {5, 3, 8, 1, 9, 2};

Step 2: Implement the linear search algorithm

In Java, we can implement the linear search algorithm by traversing the array. Traverse the array and compare the element to be found with the elements in the list one by one. If a matching element is found, the index position of the element is returned.

public class LinearSearch {
  public static int linearSearch(int[] arr, int target) {
    for (int i = 0; i < arr.length; i++) {
      if (arr[i] == target) {
        return i; // 找到目标元素，返回索引位置
      }
    }
    return -1; // 未找到目标元素，返回-1
  }
  
  public static void main(String[] args) {
    int[] arr = {5, 3, 8, 1, 9, 2};
    int target = 8;
    int index = linearSearch(arr, target);
    if (index != -1) {
      System.out.println("目标元素 " + target + " 在列表中的索引位置为 " + index);
    } else {
      System.out.println("未找到目标元素 " + target);
    }
  }
}

Step 3: Test the linear search algorithm

You can test it by defining a target element and the list to be searched, and then calling the linear search algorithm. If the target element is found, the index position of the target element in the list is output; if the target element is not found, a not-found prompt message is output.

In the above example code, we defined an array containing 6 integers and set the target element to 8. Then call the linearSearch method to perform a linear search and return the index position of the target element in the list.

If the target element exists in the list, the program will output "The index position of target element 8 in the list is 2"; if the target element does not exist in the list, the program will output "Target element 8 not found" .

Summary

Through the above steps, we can implement a simple linear search algorithm. Although the time complexity of the linear search algorithm is high, it is feasible for small-scale data search. I hope this article can help you understand how to implement linear search algorithms in Java.

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