1st Tsk
Here is a simple Java program that allows a teacher to enter students' grades and compute their average, highest, and lowest scores using an ArrayList: import java.util.ArrayList; import java.util.Scanner; public class StudentGrades { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ArrayList<Integer> grades = new ArrayList<>(); while (true) { System.out.print("Enter student grade (or -1 to finish): "); int grade = scanner.nextInt(); if (grade == -1) { break; } grades.add(grade); } if (grades.isEmpty()) { ...