Last HW. Three parallel arrays that hold 10 elements each

Array.java

*Julio Quintero
 * 5/4/2017
 * Array project
*/
import java.util.*;     // using util like always allows for the use of dialog boxes
import javax.swing.*;  // Swing allows me to use frames and more app options

class ArrayExample
{
    int studentID, averageGrade;
    String lastName;
    

    ArrayExample(int studentID,String lastName, int averageGrade){ // trying to use object oriented programing, still don't grasp the concept of it
        this.studentID=studentID;
        this.lastName=lastName;
        this.averageGrade=averageGrade;
    }
    public int getstudentID(){
        return studentID;
    }

    public String getlastName(){
        return lastName;
    }

    public int getaverageGrade(){
        return averageGrade;
    }
/*I was trying to use more object programing but it got confusing, i understand how to create methods, but the used of "this" still confusing. I used examples from the web
  */  
    public static void main(String[] args) 
    {
        ArrayList<ArrayExample> lista = new ArrayList<ArrayExample>(); // I'm calling the main method here

        int idNumber[]=new int[10], averageGrade[]=new int[10];
        String lastName[]=new String[10]; 
        
        for(int j=0;j<idNumber.length;j++){
        idNumber[j]=Integer.parseInt(JOptionPane.showInputDialog(null,"Enter ID :")); // loops
        }

        for(int j=0;j<lastName.length;j++){
        lastName[j]=JOptionPane.showInputDialog(null,"Enter Name :"); // loops
        }

        for(int j=0;j<averageGrade.length;j++){
        averageGrade[j]=Integer.parseInt(JOptionPane.showInputDialog(null,"Enter Average :"));
        }
        for(int j=0;j<10;j++){
        lista.add(new ArrayExample(idNumber[j],lastName[j],averageGrade[j]));
        }
        int inputID=Integer.parseInt(JOptionPane.showInputDialog(null,"Enter ID to search:")); // new dialog box to search for any ID number

         for(ArrayExample metodo:lista){
        	
            if (metodo.getstudentID()==inputID){
                JOptionPane.showMessageDialog(null,"Name is: "+metodo.getlastName()+" and Average is: "+metodo.getaverageGrade());
            }                    
            
            }

        }

    }