Question

How to sort ArrayList of custom objects by field value in Java

Answer 1

import java.util.ArrayList;

public class TheObject {

    private String s;

    public TheObject(String field) {
        this.s = field;
    }

    public String getFieldValue() {
        return this.s;
    }

    public static void main(String[] args) {

        ArrayList<TheObject> alist = new ArrayList<>();
        
        alist.add(new TheObject("java"));
        alist.add(new TheObject("c"));
        alist.add(new TheObject("c++"));
        alist.add(new TheObject("python"));
        alist.add(new TheObject("c#"));        
        alist.add(new TheObject("php"));

        alist.sort((o1, o2) -> o1.getFieldValue().compareTo(o2.getFieldValue()));

        for (TheObject obj : alist) {
            System.out.println(obj.getFieldValue());
        }
    }
}




/*
run:
 
c
c#
c++
java
php
python
 
*/

 

70+ SQL courses for beginners and professionals