What's the point of try {} ?

[Josep_16]

Hello. I was looking at a tutorial talking about multi-threads, and they used this example to explain the subject:

/**
 * Applet MostrarCadena
 *
 * <APPLET CODE="MostrarCadena.class" WIDTH="200" HEIGHT="70">
 *   <PARAM NAME="Cadena" VALUE="Esto sí que es chulo">
 * </APPLET>
 */

import java.applet.Applet;
import java.awt.*;

public class MostrarCadena extends Applet implements Runnable {
  String mensaje;
  int lugar;
  Thread hilo = null;
  public void init() {
    mensaje = getParameter("cadena");
    if (mensaje==null)
      mensaje = "Mensaje por defecto";
    lugar = getBounds().width;
  }
  public void start() {
    if (hilo==null) {
      hilo = new Thread(this);
      hilo.start();
    }
  }
  public void stop() {
    hilo = null;
  }
  public void paint(Graphics g) {
    g.drawString(mensaje,lugar,20);
  }
  public void run() {
    while (hilo!=null && hilo.isAlive()) {
      lugar -= 1;
      repaint();
      catch (InterruptedException e) {} // No hacemos nada
    }
  }
}

Looking at the run() method, I didn't understand why is try {} needed (

try {
        hilo.sleep(10);
      }

)

In fact, I think that I don't even know what's try{} for. I'd like someone to explain me what's its function.

THANKS.

[DarrylBurke]

Lesson: Exceptions (The Java™ Tutorials > Essential Classes)

db

[Norm]

comment out the try{}, leave the sleep() and compile your program. The compiler will give an error message explaining why it wants the try{}