How to sort the name along with age in java

Question

I am new to Java 8. I just want to sort by the name. But the condition is: if there are duplicate names then it should be sorted according to age.

For example my inp

Answer 1

// Sort Without using Comparator

import java.util.ArrayList; import java.util.List;

public class SortByNameThenAge {

static class Student {
    String name;
    int age;

    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }

}

public static void main(String[] args) {
    List olist = new ArrayList<>();
    olist.add(new Student("Sam", 26));
    olist.add(new Student("Sam", 22));
    olist.add(new Student("Abc", 25));
    olist.add(new Student("Abc", 22));
    olist.add(new Student("Abc", 23));
    olist.add(new Student("Sam", 24));
    olist.add(new Student("Sam2", 21));
    olist.add(new Student("Sam2", 19));
    // Order By name
    for (int i = 0; i < olist.size(); i++) {
        for (int j = olist.size() - 1; j > i; j--) {
            if (olist.get(i).name.compareTo(olist.get(j).name) > 0) {
                Student temp = olist.get(i);
                olist.set(i, olist.get(j));
                olist.set(j, temp);
            }
        }
    }

    for (Student s : olist) {
        System.out.println(s.name + " : " + s.age);
    }

    // Order by name then age
    for (int i = 0; i < olist.size(); i++) {
        for (int j = i+1; j < olist.size(); j++) {
            if (olist.get(i).name.compareTo(olist.get(j).name) == 0) {
                if (olist.get(i).age > olist.get(i + 1).age) {
                    Student temp = olist.get(i);
                    olist.set(i, olist.get(i + 1));
                    olist.set(i + 1, temp);
                }
            }
        }
    }
    System.out.println("\nSorting by age keeping name as it is");

    for (Student s : olist) {
        System.out.println(s.name + " : " + s.age);
    }
}

}