Thread: NullPointerException @@

package assignment;
import java.util.*;
import java.util.Stack;
 
public class Assignment {
 
   public static void main(String[] args) {
        // TODO code application logic here
        boolean exit = false;
        boolean flag = false;
        MyArrayList<GenericStack[][]>region = new MyArrayList<>();
        Container container = new Container();
        GenericStack<Container>[][]storage=new GenericStack[10][10];
 
     while(exit == false){
        System.out.println("Please select the function that you want to preform");
        System.out.println("1) Load Container into region");
        System.out.println("2) Unload the container from the region");
        Scanner input = new Scanner(System.in);
        int selection = input.nextInt();
        //switch case to select option
        switch(selection){
            case 1 : LoadObject( storage, container);
                break;
            default: System.out.println("Please key in the correct input :");
 
        }//end of the switch case
        //option for exit
        while(flag==true)
        System.out.println("Do you want to exit ? (Y/N))");
        Scanner inputExit = new Scanner(System.in);
        if(inputExit.nextInt()=='Y' || inputExit.nextInt()== 'y')
            exit = true;
        else 
            if( inputExit.nextInt()=='N' || inputExit.nextInt()=='n')
                exit = false;
            else {
               //If the user key in a non-valid input
                System.out.print("Please key in the correct input.");
                flag =true;
            }
        } 
    }//end of thw while loop
 
    public static void LoadObject(GenericStack[][]storage, Container container){
 
        System.out.println("How many container");
        Scanner input = new Scanner(System.in);
        int counter = input.nextInt();
        int i, j;
 
        for(i = 0; i <10 ; i++){
            for(j = 0 ; j< 10 ; j++){
                if(counter>0){
                    if(!storage[i][j].isEmpty()){             //<--------
                        for(i = storage[i][j].getSize() ; i < 10 ; i++ ){
                            System.out.println("Please key in the container id :\n");
                            int objectId = input.nextInt();
                            container.SetObjectId(objectId);
                            System.out.println("Please key in the container description :\n");
                            String objectDesc = input.nextLine();
                            container.SetObjectDesc(objectDesc);
                            storage[i][j].push(container);
                            counter--;
                             }//end of the insertion
                        }
                     }//end of the number of container
                   else
                        i = 10; j =10;//end the check empty if is finish container
                    }//end of the for loop
                }//end of the for loop
            }
 
 
     }

Here is part of my coding @@
i have no idea why there is a "NullPointerException" error when i run it. I have no idea what it is please help me.

Originally Posted by GregBrannon

Why the '@@'? Is that relevant?

Some sort of annoying emoticon perhaps.