CliBase.java

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

public class CliBase{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        List<Task> t = new ArrayList<>();
        System.out.println("What you will perform?(Enter 'exit' to quit)");
        int nextId = 1;
        //loop runs continously so to stop it we should write a break statement;
        while(true){
            System.out.print("$ ");
            String s = sc.next();
              //statement to become true to break the loop
            if(s.equalsIgnoreCase("exit")){
                System.out.println("Exiting Program....");
                break;
            }else{
                switch (s) {
            case "add-task":
                System.out.print("$ Enter the task : ");
                String skip = sc.nextLine(); //as nextLine skips statement we are writing this skip scanner to deal with it
                String addTask = sc.nextLine();
                Task taskObject = new Task(addTask, nextId, false);
                t.add(taskObject);
                nextId++;
                System.out.println("$ Task added Successfully");
                break;
            case "update-task":
                System.out.print("$ Enter task number you want to mark as done : ");
                int updateId = sc.nextInt();
                boolean done = false;
                int j = 0;
                while(j < t.size()){
                    if(updateId == t.get(j).getId()){
                        t.get(j).setCompleted(true);
                        System.out.println("$ Marked as Done Successfully");
                        done = true;
                        break;
                    }
                    j++;
                }
                if(done == false){
                    System.out.println("$ Invalid Task!!");
                }
                break;
            case "delete-task":
                System.out.print("$ Enter task number you want to delete : ");
                boolean found = false;
                int deleteId = sc.nextInt();
                for(int i = 0;i < t.size();i++){
                    if(deleteId == t.get(i).getId()){
                        t.remove(i);
                        found = true;
                        System.out.println("$ Task deleted successfully...");
                        break;
                    }
                }
                if(found == false){
                    System.out.println("$ Invalid Id task not found");
                }
                break;
            case "list-task":
                System.out.println("$ List of all the task : ");
                  // Iterating through the List
                  for (Task newTask : t){
                    System.out.println(newTask.toString());
                  }
                break;
            default:
                break;
            }
          }
       }
    }
}