Новий спосіб
import java.util.Comparator;
fruits.sort(Comparator.comparing(o -> o.getDate()));
for (Fruit fruit : fruits) {
System.out.println(fruit);
}
Старий спосіб
public class Student implements Comparable<Student> {
private String studentname;
private int studentage;
public Student(String name, int age) {
this.studentname = name;
this.studentage = age;
}
@Override
public int compareTo(Student next) {
return this.studentage - next.studentage;
}
@Override
public String toString() {
return "[ name = " + studentname + ", age = " + studentage + " ]";
}
}
import java.util.ArrayList;
import java.util.Collections;
public static void main(String[] args) {
ArrayList<Student> arraylist = new ArrayList<Student>();
arraylist.add(new Student("Taras", 40));
arraylist.add(new Student("Vitaliy", 30));
arraylist.add(new Student("Andriy", 20));
Collections.sort(arraylist);
for(Student str: arraylist){
System.out.println(str);
}
}
[ name = Andriy, age = 20 ]
[ name = Vitaliy, age = 30 ]
[ name = Taras, age = 40 ]
List<Fruit> sortedLetters = fruits.stream().sorted().collect(Collectors.toList());