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

//Demonstrate the Block Scope.
//<applet code="Scope" height=50 width=150></applet>
public class Scope extends Applet{
  public void paint(Graphics g) {

    int x; //known to all code within main

    x = 10;
    if(x == 10) { //start new scope
      int y = 20; //known only to this bock
      g.drawString("x and y: " + x + " " + y,20,20); 
      x = y * 2;
    }
    // y = 100; Error y not know here.

    // x is still known here.
    g.drawString("x is " + x,20,40);
  }
}