Answer by djklicks-dhananjay for How to sort List of objects by some property

The best and the easiest way to sort any list of objects in Java (Java 8 and above).Lets sort a basket of fruits based on the property "fruitName"

Fruit POJO:

class Fruit{    int price;    String fruitName;    public Fruit(int price, String fruitName) {        super();        this.price = price;        this.fruitName = fruitName;    }    public int getPrice() {        return price;    }    public void setPrice(int price) {        this.price = price;    }    public String getFruitName() {        return fruitName;    }    public void setFruitName(String fruitName) {        this.fruitName = fruitName;    }    @Override    public String toString() {        return "Fruits [price=" + price +", fruitName=" + fruitName +"]";    }}

Now lets add fruits into a list and then sort it

List<Fruit> basketOfFruits = new ArrayList<>();        basketOfFruits.add(new Fruit(123, "oranges"));        basketOfFruits.add(new Fruit(45, "nectarine"));        basketOfFruits.add(new Fruit(369, "blueberries"));        basketOfFruits.add(new Fruit(248, "apple"));        basketOfFruits.add(new Fruit(968, "peaches"));        basketOfFruits.add(new Fruit(436, "grapes"));        basketOfFruits.add(new Fruit(596, "figs"));       //sorting by the property fruitName        Collections.sort(basketOfFruits, (f1, f2)->{return f1.getFruitName().compareTo(f2.getFruitName());}); 

You can now print the list (i.e basketOfFruits) and the fruits in the list would be sorted in ASCENDING order (lexicographically).The output would look like this:

[Fruits [price=248, fruitName=apple], Fruits [price=369, fruitName=blueberries], Fruits [price=596, fruitName=figs], Fruits [price=436, fruitName=grapes], Fruits [price=45, fruitName=nectarine], Fruits [price=123, fruitName=oranges], Fruits [price=968, fruitName=peaches]]

Instead of Collections.sort(), Java streams can also be used (Java 8 and above). The following is the code using Java streams

List<Fruit> sortedFruits = basketOfFruits.stream().sorted( (f1, f2)->{return f1.getFruitName().compareTo(f2.getFruitName());}).collect(Collectors.toList());

here the list is sorted in the same manner as Collections.sort(), but the sorted items would be stored/collected in another list "sortedFruits". So, if we want to print the sorted items of the list, we need to print "sortedFruits" instead of "basketOfFruits" in this case