targil solution

GetInfo.java
=====================
package Cls;

public class GetInfo {
    int avg;
    int lowGrade;
    int lowID;
    int highGrade;
    int highID;

    public GetInfo() {
        this.avg = 0;
        this.lowGrade = 100;
        this.lowID = 0;
        this.highGrade = 0;
        this.highID = 0;
    }

    public int getAvg() {
        return avg;
    }

    public int getLowGrade() {
        return lowGrade;
    }

    public int getLowID() {
        return lowID;
    }

    public int getHighGrade() {
        return highGrade;
    }

    public int getHighID() {
        return highID;
    }
}



Student.java
===================package Cls;

import java.util.Vector;

public class Student {
    private String name;
    private int id;
    private int grade;

    public Student(String name, int id, int grade) {
        this.name = name;
        this.id = id;
        this.grade = grade;
    }

    public static GetInfo getInfo(Vector<Student> students){
        GetInfo getInfo = new GetInfo();
        for (Student item : students){
            getInfo.avg+=item.grade;
            //check low grade
            if (item.grade<getInfo.lowGrade){
                getInfo.lowGrade=item.grade;
                getInfo.lowID=item.id;
            }
            if (item.grade>getInfo.highGrade){
                getInfo.highGrade=item.grade;
                getInfo.highID=item.id;
            }
        }
        getInfo.avg/=students.size();
        return getInfo;
    }
}


Tester.java
===================
package Tester;

import Cls.GetInfo;
import Cls.Student;

import java.util.Vector;

public class MyTester {
    public static void main(String[] args) {
        Vector<Student> myStudents = new Vector<>();
        myStudents.add(new Student("Mais",123456, 60));
        myStudents.add(new Student("Elian", 4568944,55));
        myStudents.add(new Student("Grande", 34532,95));
        myStudents.add(new Student("Moses", 2356123,98));
        myStudents.add(new Student("Daniel", 278723,94));
        myStudents.add(new Student("Michael", 6754745,90));
        myStudents.add(new Student("Avi", 8765,40));
        myStudents.add(new Student("Gal", 23423,75));
        myStudents.add(new Student("Alona", 76544,100));
        myStudents.add(new Student("Noa", 123543,99));

        GetInfo myInfo = Student.getInfo(myStudents);
        System.out.println("Avg: "+myInfo.getAvg());
        System.out.println("low grade: "+myInfo.getLowGrade()+" "+myInfo.getLowID());
        System.out.println("high grade: "+myInfo.getHighGrade()+" "+myInfo.getHighID());

    }
}