import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.attribute.Attribute;
import javax.print.attribute.AttributeSet;
import javax.print.attribute.HashAttributeSet;
import javax.print.attribute.PrintServiceAttributeSet;
import javax.print.attribute.standard.Destination;
import javax.print.attribute.standard.PrinterInfo;
import javax.print.attribute.standard.PrinterIsAcceptingJobs;
import javax.print.attribute.standard.PrinterLocation;
import javax.print.attribute.standard.PrinterMakeAndModel;
import javax.print.attribute.standard.PrinterName;
import javax.print.attribute.standard.PrinterState;
 
/**
 * Ejemplos para ver tus impresoras
 * @author Peiretti
 */
public class PrintExamples {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
 
        printAvailable();
        printDefault();
        printByName("MiImpresora");
    }
 
    public static void printAvailable() {
 
        // busca los servicios de impresion...
        PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null);
 
        // -- ver los atributos de las impresoras...
        for (PrintService printService : services) {
 
            System.out.println(" ---- IMPRESORA: " + printService.getName());
 
            PrintServiceAttributeSet printServiceAttributeSet = printService.getAttributes();
 
            System.out.println("--- atributos");
 
            // todos los atributos de la impresora
            Attribute[] a = printServiceAttributeSet.toArray();
            for (Attribute unAtribute : a) {
                System.out.println("atributo: " + unAtribute.getName());
            }
 
            System.out.println("--- viendo valores especificos de los atributos ");
 
            // valor especifico de un determinado atributo de la impresora
            System.out.println("PrinterLocation: " + printServiceAttributeSet.get(PrinterLocation.class));
            System.out.println("PrinterInfo: " + printServiceAttributeSet.get(PrinterInfo.class));
            System.out.println("PrinterState: " + printServiceAttributeSet.get(PrinterState.class));
            System.out.println("Destination: " + printServiceAttributeSet.get(Destination.class));
            System.out.println("PrinterMakeAndModel: " + printServiceAttributeSet.get(PrinterMakeAndModel.class));
            System.out.println("PrinterIsAcceptingJobs: " + printServiceAttributeSet.get(PrinterIsAcceptingJobs.class));
 
        }
 
    }
 
    public static void printDefault() {
 
        // tu impresora por default
        PrintService service = PrintServiceLookup.lookupDefaultPrintService();
        System.out.println("Tu impresora por default es: " + service.getName());
 
    }
 
    public static void printByName(String printName) {
 
    	PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null);
 
        // buscar por el nombre de la impresora (nombre que le diste en tu S.O.)
        // en "aset" puedes agregar mas atributos de busqueda
        AttributeSet aset = new HashAttributeSet();
        aset.add(new PrinterName(printName, null));
        //aset.add(ColorSupported.SUPPORTED); // si quisieras buscar ademas las que soporten color
 
        services = PrintServiceLookup.lookupPrintServices(null, aset);
        if(services.length == 0){
        	System.out.println("No se encontro impresora con nombre " + printName);
        }
        for (PrintService printService : services) {
        	System.out.println(printService.getName());
		}
    }
}

public @interface MiAnotacion {
String id();
String nombre();
}

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
 
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface StringValid {
 
public int minLength();
 
public int maxLength();
 
}

public class User {
 
private int id;
private String name;
private String password;
 
//... seters y geters...
 
}

public class User {
 
    private int id;
 
    @StringValid(minLength = 1, maxLength = 120)
    private String name;
 
    @StringValid(minLength = 6, maxLength = 20)
    private String password;
 
   //... seters y geters...
 
}

//--
 
import java.lang.reflect.Field;
 
public class UserProcess {
 
    public static void main(String[] args) throws Exception {
 
        // Creamos nuestro objecto y lo seteamos
        User user = new User();
        user.setId(1);
        user.setName("Gustavo");
        user.setPassword("pass");
 
        // recorremos todos los atributos de la clase
        for (Field field : user.getClass().getDeclaredFields()) {
 
            if(! field.isAnnotationPresent(StringValid.class)){
                continue; // no tiene anotacion
            }
 
            // tomamos la anotacion de atributo
            StringValid stringValidAnnotation = field.getAnnotation(StringValid.class);
 
            // hago accesible el atributo privado
            field.setAccessible(true);
 
            // obtengo el valor del atributo
            String valueString = (String) field.get(user);
 
            System.out.print("Nombre del atributo: " + field.getName());
            System.out.print(" - contiene: " +  valueString);
            System.out.print(" - minimo permitido: " + stringValidAnnotation.minLength());
            System.out.print(" - maximo permitido: " + stringValidAnnotation.maxLength());
 
            System.out.print(" - length: " + valueString.length());
 
            // valido comparando el lenght del valor seteado con el lenght permitido 
 
            if(valueString.length() < stringValidAnnotation.minLength()){
                System.out.print(" - ES MENOR QUE EL MINIMO PERMITIDO " + stringValidAnnotation.minLength());
            }
 
            if(valueString.length() > stringValidAnnotation.maxLength()){
                System.out.print(" - ES MAYOR QUE EL MAXIMO PERMITIDO " + stringValidAnnotation.minLength());
            }
 
            System.out.println("");
            System.out.println("-----------------------------------------------------------");
 
        }        
 
    }
 
}
 
//--

public class User {
 
    private int id;
 
    @StringValid(maxLength = 120) // hemos omitido minLength
    private String name;
 
    @StringValid(minLength = 6, maxLength = 20)
    private String password;
}