how do i output my array and list it in a single dialog box

[atoivan]

1).i want to list may array in a single dialog-box? i am very new to JOptionPane and arrays.

the program accept student name and grades and output it.use an array.

it also traverses the array and allow the user to perform the following processes

a) search for a particular student and his or her marks
b)find the average of all the student in the class
c)find all student with a mark below 50 and output them.

import javax.swing.JOptionPane;
import java.util.Arrays;
 
public class  pdemo {
    private String[] names;
    private int [] grade;
   public int Nos;
    private String num;
    public String  go  ,b,c,x;
 
    public pdemo()
    {
        num =JOptionPane.showInputDialog( null,"Welcome Enter the Number of student taking This Couse");
         Nos = Integer.parseInt(num);
        names = new String[Nos];
        grade=new int [Nos];
    }
    public void inputNames() 
    {int z =1;
        for (int i = 0; i < names.length; i++) {
          names[i] =  JOptionPane.showInputDialog("Enter name: "+z);
          ++z;
        }
    }
    public void inputGrades()
    {
 
  for(int i=0; i<grade.length ; i++)
  {int z=1;
      System.out.println("Enter the grade ");
num =JOptionPane.showInputDialog(null,"Enter the grade "+ z);
        grade[i] =Integer.parseInt(num);
        ++z;
 }
        }
    public void trav()
    {
        for (int da=0;da<names.length;da++)    {
      JOptionPane.showMessageDialog(null, da+ ":"+ names[da]+" :"+grade[da]);
Array.sort(names);
        }
    }
 
    public void search(String name)
    {
       int i=0;
            {
   name = JOptionPane.showInputDialog ("What is the name of the student u are looking for?");
            }
{
  for( ; i<names.length ; i++){
      if( names[i].equals(name) ){
           JOptionPane.showMessageDialog(null,"found " + names[i] + " at index " + i + " with grade " + grade[i]);
 
      }
  }
}
 
    }
public void average()
        {
    double ave=0;
     /*if (b==b)*/{
         for(int i=0; i<grade.length ; i++)
 {
 ave+=grade[i];
             }
        JOptionPane.showMessageDialog(null,"The average of the total student body is:"+ ave);
 
     }
}
     public void below(){
         /*if (c==c)*/{
  JOptionPane.showMessageDialog(null,"The following people have a grade lower than 50");
 
  for(int i=0 ; i<grade.length ; i++){
      if( grade[i]<50 ){
           JOptionPane.showMessageDialog(null,names[i] + ": " + grade[i]);
      }
  }
}
}
 
}
import java.io.*;
public class Main {
public static int n;
public static String name;
    /**
     * @param args the command line arguments
     */ 
    private static BufferedReader stdin =  new BufferedReader( new InputStreamReader( System.in ) );
    public static void main(String[] args)
            throws IOException
    {
        pdemo demo = new pdemo();
        demo.inputNames();
        demo.inputGrades();
        demo.trav();
       //demo.sele();
      demo.search(name);
      demo.below();
      demo.average();
 
    }
}