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Java Sort List Of Objects By Field

Last Updated : Jul 1, 2023

Java Sort List Of Objects By Field

In this article we will show you the solution of java sort list of objects by field, programming tasks sometimes involve sorting a list of objects by a specific field in Java.

The performance and usefulness of your code can be greatly improved by being able to sort items effectively, whether you're working on a large-scale commercial programme or a tiny personal project.

Thankfully, Java offers a number of methods for sorting objects by fields, including using Comparator classes and implementing the Comparable interface.

We'll discuss the idea of sorting a list of objects in Java by a field.

Step By Step Guide On Java Sort List Of Objects By Field :-

import java.util.Arrays;
import java.util.Scanner;
class SortSelection {
 private static Scanner sc;
 public static void main(String args[]) {
  sc = new Scanner(System.in);
  System.out.println("Enter no of terms");
  int n = sc.nextInt();
  System.out.println("Enter the terms");
  int arr[] = new int[n];
  for (int i = 0; i < n; i++)
   arr[i] = sc.nextInt();
  System.out.println("The unsorted array is:");
  System.out.println(Arrays.toString(arr));
  sort(arr);
  System.out.println("The sorted array is:");
  System.out.println(Arrays.toString(arr));
 }
 static void sort(int arr[]) {
  for (int i = 0; i < arr.length - 1; i++) {
   int iMin = i;
   for (int j = i + 1; j < arr.length; j++)
    if (arr[j] < arr[iMin])
     iMin = j;
   if (i != iMin) {
    int temp = arr[i];
    arr[i] = arr[iMin];
    arr[iMin] = temp;
   }
  }
 }
}
  1. Here, you can see how the selection sort algorithm was written in Java to sort an array of integers.
  2. The Arrays & Scanner classes obtained from the Java utility package are imported to begin coding.
  3. It then declares a class with a main method as well as a sort method called SortSelection.
  4. A for loop plus the Scanner class is used to read in an array of integer of size n inside the main method when the user is prompted to input the number of phrases.
  5. The unsorted array is then displayed on the console by using the "toString" function of the Arrays class.
  6. The sort method, which applies the selection sort algorithm, is then invoked by the main function.
  7. The sort method iterates through the array using two nested for loops, looking for the minimum member in each pass.
  8. The elements are switched if the minimum element is discovered.
  9. The sorted array is displayed to the terminal using the Arrays class method "toString" when the sort method has finished.

Conclusion :-

Hence we have successfully learned the concept of java sort list of objects by field.

We also learned the code takes input from the user, reads in the array of integers, and displays the unsorted and sorted arrays using the Arrays class method "toString".

The sort method uses two nested for loops to iterate over the array and find the minimum element in each pass, and then swaps the elements if necessary.

The code demonstrates the use of arrays, loops, and methods in Java and provides a practical example of how to sort an array using the selection sort algorithm.

I hope this article on java sort list of objects by field helps you and the steps and method mentioned above are easy to follow and implement.