3.- Sentencias de control
Ejemplo de la sentencia switch
public class Nota {
    
public static void main(String [] args) throws IOException
{
BufferedReader in=new BufferedReader(new InputStreamReader (System.in));

int num;

System.out.println("Escribe tu nota: ");
num= Integer.valueOf(in.readLine().trim()).intValue();

switch(num) {
 case 1: 
     
 case 2: 
     
 case 3: 
     
 case 4: 
     System.out.println("Suspenso");
     break;  
 case 5: 
     System.out.println("Suficiente");
     break;
 case 6: 
     System.out.println("Bien");
     break;
case 7: 

case 8: 
     System.out.println("Notable");
     break;
 case 9: 
     System.out.println("Sobresaliente");
     break;
case 10: 
     System.out.println("Matricula de honor");
     break;
default: 
     System.out.println("Desconocido");
     break;
	}
	
}
}