From Forum Nokia Wiki

The following code creates a Text Box.

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
public class TextBox_Example extends MIDlet 
{    
   Display display=Display.getDisplay(this);    
 
   public void startApp()     
   {        
    //TextBox(title,text,size,contrains)        
    TextBox textbox = new TextBox("Text Box Example",
                                       "This is an example of a TextBox",50,0);        
    display.setCurrent(textbox);    
   }
}