Implementing Gauss Seidel Method in Java

Java Program to Sort ArrayList of Custom Objects By Property

Last Updated : 17 Nov, 2020

Here we are going to look at the approach of sorting an ArrayList of custom objects by using a property.

Approach:

1. Create a getter function which returns the value stored in the class variable.

2. Create a list and use sort() function which takes the values of the list as arguments and compares them with compareTo() method.

3. This function will then return a positive number if the first argument’s property is greater than the second’s, negative if it is less and zero if they are equal.

Implementation

Java

// Java Program to Sort ArrayList of Custom Objects By 
// Property 
  
import java.util.*; 
  
public class Main { 
    private String value; 
  
    public Main(String val) { this.value = val; } 
  
    // Defining a getter method 
    public String getValue() { return this.value; } 
  
    // list of Main objects 
    static ArrayList<Main> list = new ArrayList<>(); 
  
    public static void sortList(int length) 
    { 
        // Sorting the list using lambda function 
        list.sort( 
            (a, b) -> a.getValue().compareTo(b.getValue())); 
        System.out.println("Sorted List : "); 
  
        // Printing the sorted List 
        for (Main obj : list) { 
            System.out.println(obj.getValue()); 
        } 
    } 
  
    public static void main(String[] args) 
    { 
        // take input 
        Scanner sc = new Scanner(System.in); 
        System.out.print( 
            "How many characters you want to enter : "); 
        int l = sc.nextInt(); 
  
        // Taking value of list as input 
        for (int i = 0; i < l; i++) { 
            list.add(new Main(sc.next())); 
        } 
  
        sortList(); 
    } 
}

Output

Output of the program

Implementing Gauss Seidel Method in Java

rbbansal

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