Java 8 lambda filtering based on condition as well as order

Question

I was trying to filter a list based on multiple conditions, sorting.

class Student{
        private int Age;
        private String className;
        privat         


        

Answer 1

If you need a grouping only sorted, it is quite simple:

Map> collect = students.stream() // stream capabilities
        .sorted(Comparator.comparingInt(Student::getAge).reversed()) // sort by age, descending
        .collect(Collectors.groupingBy(Student::getName)); // group by name.

Output in collect:

• Prince=[Student [Age=24, className=B, Name=Prince]],
• Smith=[Student [Age=24, className=A, Name=Smith]],
• John=[Student [Age=30, className=A, Name=John], Student [Age=24, className=A, Name=John], Student [Age=20, className=B, Name=John]]