String padThis( String text, int lenny )
   {
      if( lenny < 0 )
         throw new IllegalArgumentException( "Length can't be negative!" );
      StringBuffer buffy = new StringBuffer( text );
      buffy.insert(0,"*");  // Should always have at least 1 asterisk.
      while( buffy.length() < lenny )
         buffy.insert(0,"*");
      return buffy.toString();
   }

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.text.DecimalFormat;
 
 class labB extends Object
{ int len;
  String tmp, d;
   
	
	public labB( String b)
	{   tmp=b;
		len= tmp.length(); //get length of string
		
	}
 
   //bring string and length in
   String padThis( String text , int lenny) 
   {  	   
	   int max = 9; //max space in check
	   
	   if( lenny < 0 )        
	     throw new IllegalArgumentException( "Length can't be negative!" );      
     
	 StringBuffer buffy = new StringBuffer( text );      
      //protect check
   while( buffy.length() < max )         
		{  
	      buffy.insert(0,"*");
		
		}
        return buffy.toString();  
   
   }
    
  public String toString()
 {
   return padThis(tmp,len);
 }
	
	
}
 
public class checkVal extends JFrame
{
	private JTextField input;
    private JTextArea outputArea;
    private double p;
 
	public checkVal()
	{
 
     super("Check Protection Program");
     getContentPane().setLayout(new FlowLayout() );
     JLabel prompt= new JLabel("Enter Check Amount");
 
      getContentPane().add(prompt);
       input = new JTextField(10);
        JButton b = new JButton(" Protect ");
 
     
       b.addActionListener(new ActionListener()
  {
     public void actionPerformed (ActionEvent e)
	  {	 
		 p= Double.parseDouble(input.getText());
                
	  
	  //if user enter's 5  convert to 5.00 or 5.8 to 5.80
      DecimalFormat twoDigits = new DecimalFormat("0.00");
	     String h=  twoDigits.format(p);
		 String y=  h;  
	  
      
	  outputArea.append(y.toString()+ "\n");
    }
 }
);
getContentPane().add(input);
getContentPane().add(b);
 
outputArea = new JTextArea(10,20);//width,height panel
outputArea.setEditable(false);
getContentPane().add(new JScrollPane(outputArea));
setSize(275,260);// width,height Win grey
show();
}
 
public static void main(String args[])
{
   checkVal window = new checkVal();
 
  window.addWindowListener(new WindowAdapter()
{
   public void windowClosing(WindowEvent windowEvent)
{
   System.exit(0);
}
}
);
}
}

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.text.DecimalFormat;
 
public class checkVal extends JFrame
{
   private int fieldWidth = 9;
   private final String entryFormatMessage = "Please enter only valid " +
                                             "numbers, without letters " +
                                             "or other symbols.";
   private JTextField input;
   private JTextArea outputArea;
   private double p;
   public checkVal() 
   {
      super("Check Protection Program");
      getContentPane().setLayout(new FlowLayout());
      JLabel prompt = new JLabel("Enter Check Amount");
      getContentPane().add(prompt);
      input = new JTextField(10);
      JButton b = new JButton(" Protect ");
      b.addActionListener( new ActionListener() 
                           {
                              public void actionPerformed(ActionEvent e)
                              {
                                 try
                                 {
                                    p = Double.parseDouble(input.getText());
                                    
                                    //if user enter's 5  convert to 5.00 or 5.8 to 5.80   
                                    DecimalFormat twoDigits = new DecimalFormat("0.00");
                                    String h = twoDigits.format(p);
                                    String y = padThis(h, fieldWidth);
                                    outputArea.append(y.toString() + "\n");
                                 }
                                 catch( java.lang.NumberFormatException nfe )
                                 {
                                    JOptionPane.showMessageDialog( checkVal.this, 
                                                                   entryFormatMessage );
                                 }
                              }
                           });
      getContentPane().add(input);
      getContentPane().add(b);
      outputArea = new JTextArea(10, 20); //width,height panel
      outputArea.setEditable(false);
      getContentPane().add(new JScrollPane(outputArea));
      setSize(275, 270); // width,height Win grey
      show();
   }
   private String padThis(String text, int lenny)
   {
      if(lenny < 0)
         throw new IllegalArgumentException("Length can't be negative!");
      StringBuffer buffy = new StringBuffer(text);
      buffy.insert(0, "*"); // Should always have at least 1 asterisk.      
      while(buffy.length() < lenny)
         buffy.insert(0, "*");
      return buffy.toString();
   }
   public static void main(String args[])
   {
      checkVal window = new checkVal();
      window.addWindowListener(new WindowAdapter() 
      {
         public void windowClosing(WindowEvent windowEvent)
         {
            System.exit(0);
         }
      });
   }
}