Java Problem for real java programmer

[Testgamma1]

Code:

import javax.swing.JOptionPane;

public class Test2
{
    public static void main (String [] args)
    {

        String inp;
        int cho, input, index;
        int [] number = new int [10];
                input=index=0;            
      
      
      
    do
    {              
              
    inp=JOptionPane.showInputDialog(" Choose number: \n1. Push    \n2. Pop\n 3. Display\n 4. Exit ");
    cho =Integer.parseInt(inp);

    if (cho == 1)
        {
            if (input<10)
            {  
              
                inp=JOptionPane.showInputDialog("Index "+ (input)+(" of 9:"),"");
                number[input]=Integer.parseInt(inp);
                input++;  
              
                JOptionPane.showMessageDialog(null,"                Updated!","Update Message",JOptionPane.INFORMATION_MESSAGE);              
            }
            else
            {
                JOptionPane.showMessageDialog(null," Full\n ","Overflow",JOptionPane.ERROR_MESSAGE);
            }
                  
                              
          
                  
        }
      
    else if (cho==2)
        {
            if (number [0]==0)
            {
                JOptionPane.showMessageDialog(null,"        Input at least 1 first before pressing 2","No Stack",JOptionPane.ERROR_MESSAGE);
            }
      

            else
            {
                number[input-1]=0;
                input--;
              
                JOptionPane.showMessageDialog(null,"                Updated!","Update Message",JOptionPane.INFORMATION_MESSAGE);              
            }
        }  
  
    else if (cho==3)
        {
                    System.out.print("STACK: ");  
      
        for (index=0; index<=9; index++)
            {
              
          
                System.out.print("||"+number[index]+"|| ");
          
          
            }
          
          
                System.out.print("\n");
                System.out.print("INDEX: ");
          
        for (index=0;index<=9;index++)
            {
                System.out.print("||"+index+"|| ");
            }
          
            System.out.print("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
        }
  
    else if (cho==4)
        {
            JOptionPane.showMessageDialog(null,"                Exit!");
        }
  
  
    else
        {
            JOptionPane.showMessageDialog(null,"               Invalid Input!");
        }  
      
      
                System.out.print("S T A C K:\n");  
      
        for (index=0; index<=9; index++)
            {
                System.out.print("||  "+number[index]+"  \n");
            }
          
              
                System.out.print("\n");
          
          
                System.out.print("I N D E X:\n");  
      
        for (index=0; index<=9; index++)
            {              
            System.out.print("||  "+index+"\n");
            }
          
            System.out.print("\n");
          
      
    }
  
    while(cho!=4);
          
    }
}

this is the code,... before,. but in the last day at the school i do some modification here, like removing some text to make it clean,..