Algorithm

  1. Define a Custom Object:

    • Create a class for the custom object with the desired properties.
    • Implement the Comparable interface if you want to use the natural ordering or create a custom Comparator if you want to specify the ordering.

  2. Implement Comparable or Comparator:

    • If using the Comparable interface, override the compareTo method inside the custom object class.
    • If using a custom Comparator, create a separate class that implements the Comparator interface and override the compare method.

  3. Sorting Logic:

    • Use the Collections.sort() method to sort the ArrayList.
    • Pass the ArrayList and either an instance of the custom object class (if using Comparable) or an instance of the custom Comparator class to the sort method.

 

Code Examples

#1 Code Example- Java Programing Sort ArrayList of Custom Objects By Property

Code - Java Programming

import java.util.*;

public class CustomObject {

    private String customProperty;

    public CustomObject(String property) {
        this.customProperty = property;
    }

    public String getCustomProperty() {
        return this.customProperty;
    }

    public static void main(String[] args) {

        ArrayList < Customobject> list = new ArrayList<>();
        list.add(new CustomObject("Z"));
        list.add(new CustomObject("A"));
        list.add(new CustomObject("B"));
        list.add(new CustomObject("X"));
        list.add(new CustomObject("Aa"));

        list.sort((o1, o2) -> o1.getCustomProperty().compareTo(o2.getCustomProperty()));

        for (CustomObject obj : list) {
            System.out.println(obj.getCustomProperty());
        }
    }
}
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Output

x
–
+
cmd
A
Aa
B
X
Z
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Demonstration

Java Programing Example to Sort ArrayList of Custom Objects By Property-DevsEnv