Alphabetically Sort a Java Collection based upon the 'toString' value of its member items

Question

Assume I have a user defined Java class called Foo such as:

public class Foo 
{

    private String aField;

    @Override
    public String toString()
    {         


        

Answer 1

Sort ArrayList on POJO int property (Ascending or Descending):

Collections.sort(myPojoList, (a, b) -> a.getId() - b.getId()); //ASC
Collections.sort(myPojoList, (a, b) -> b.getId() - a.getId()); //DESC

//Alternatively use Integer.compare()
Collections.sort(myPojoList, (a, b) -> Integer.compare(a.getId(), b.getId())); //ASC
Collections.sort(myPojoList, (a, b) -> Integer.compare(b.getId(), a.getId())); //DESC

Sort ArrayList on POJO String property:

Collections.sort(myPojoList, (a, b) -> a.getName().compareTo(b.getName())); //ASC
Collections.sort(myPojoList, (a, b) -> b.getName().compareTo(a.getName())); //DESC

Sort ArrayList on POJO Boolean property:

Collections.sort(myPojoList, (a, b) -> Boolean.compare(a.isMale(), b.isMale())); //ASC
Collections.sort(myPojoList, (a, b) -> Boolean.compare(b.isMale(), a.isMale())); //DESC

Extra: get distinct ArrayList

myPojoList= new ArrayList<>(new LinkedHashSet<>(myPojoList)); //Distinct