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DoubleValueComputer adder = new DoubleValueComputer() {
    @Override
    public double compute(double x, double y) {
        return x + y;
    }
};
 
DoubleValueComputer multiplier = new DoubleValueComputer() {
    @Override
    public double compute(double x, double y) {
        return x * y;
    }
};
 
 

DoubleValueComputer adder = (x, y) -> x + y;
DoubleValueComputer multiplier = (x, y) -> x * y;

persons.sort(new Comparator<Person>() {
    @Override
    public int compare(Person a, Person b) {
        return a.getName().compareTo(b.getName());
    }
});

persons.sort((a, b) -> a.getName().compareTo(b.getName()));

persons.sort(new Comparator<Person>() {
    @Override
    public int compare(Person a, Person b) {
        return a.getAge() - b.getAge();
});

persons.sort((a, b) -> a.getAge() - b.getAge());