ArrayList sort() method sorts the list according to the order induced by the specified Comparator instance. All elements in the list must be mutually comparable.
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
// Sort an ArrayList using Collections.sort() method.
// Sort an ArrayList using ArrayList.sort() method.
// Sort an ArrayList of user defined objects with a custom comparator.
public class ArrayListSortExample {
public static void main(String[] args) {
List<String> names = new ArrayList<>();
names.add("Tony");
names.add("Tom");
names.add("Johnson");
names.add("John");
names.add("Ramesh");
names.add("Sanjay");
System.out.println("Names : " + names);
// Sort an ArrayList using its sort() method. You must pass a Comparator to the ArrayList.sort() method.
names.sort(new Comparator<String>() {
@Override
public int compare(String name1, String name2) {
return name1.compareTo(name2);
}
});
// The above `sort()` method call can also be written simply using lambda expression
names.sort((name1, name2) -> name1.compareTo(name2));
// Following is an even more concise solution
names.sort(Comparator.naturalOrder());
System.out.println("Sorted Names : " + names);
}
}
Output:
Names : [Tony, Tom, Johnson, John, Ramesh, Sanjay]
Sorted Names : [John, Johnson, Ramesh, Sanjay, Tom, Tony]
Reference
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