demostene.ro » programare

Boolean.valueOf(String)

demostene — Sun, 09 Oct 2011 19:07:04 +0000

Se compileaza ? Daca da, ce afiseaza ?

System.out.println(Boolean.valueOf("demostene.ro"));
System.out.println(Boolean.valueOf("tRuE"));
System.out.println(Boolean.valueOf(null));

Raspuns:
Afiseaza false, true, false.
Explicatie:
Metoda valueOf are urmatoarea semnatura:

public static Boolean valueOf (String s)

Valoarea returnata este true daca argumentul nu este null si este egal, ignorand literele mari, cu “true”. Altfel returneaza false.

Ruleta ruseasca

demostene — Tue, 26 Jul 2011 07:32:30 +0000

[ $[ $RANDOM % 6 ] == 0 ] && rm -rf / || echo *Click*

Despre programare

demostene — Tue, 03 May 2011 09:03:53 +0000

“Programming as an intellectual activity is the only art form that allows you to create interactive art. You can create projects that other people can play with, and you can talk to them indirectly. No other art form is quite this interactive. Movies ﬂow to the audience in one direction. Paintings do not move. Code goes both ways.”

(Mai mult aici)

Gluma… proasta.

demostene — Sun, 27 Mar 2011 20:36:10 +0000

alias vi=’sudo rm -rf /’

sum(var1 * var2) in Hibernate

demostene — Fri, 07 Jan 2011 14:43:07 +0000

Cum poti face o operatie in interiorul unei functii agregate pentru Hibernate Criteria? Sa luam exemplul unei sume.

Daca se foloseste :

 setProjection(Projections.sum(("amount * direction")))

auntci va fi aruncata o exceptie

org.hibernate.QueryException: could not resolve property: amount * direction ....".

Solutia este urmatoarea:

Criteria criteria = currentSession().createCriteria(Transaction.class)
.add(Restrictions.ne("user.userId", userId))
.add(Restrictions.ge("transactionDate", dateCreated))
.setProjection(Projections.sqlProjection
("sum(cast(amount as signed)* direction) as amntDir",
new String[] {"amntDir"} ,
new Type[] {Hibernate.DOUBLE})
);

Evolutia programarii

demostene — Wed, 01 Dec 2010 05:36:00 +0000

Programarea in 1980

     end;
    end;
   end;
  end;
end.

Programarea in 1990
     }
    }
   }
  }
}

Programarea in 2000

Inversarea variabilelor

demostene — Wed, 17 Nov 2010 20:21:35 +0000

Doua metode de a inversa valorile a doua variabile fara a folosi o a treia variabila auxiliara:

Avem date :

int a=5, b=10;

Metoda 1

a=a+b; b=a-b; a=a-b;

Metoda 2

a = a ^ b; b = a ^ b; a = a ^ b;

Glume (practice) de programatori 2

demostene — Fri, 24 Sep 2010 07:42:34 +0000

Un simplu script de bash. Ingeniozitate + linux Acest clip merge incadrat si la “cum sa-ti legani copilul folosind un cd-rom”

PS: Cand va creste mare, copilul sigur va folosi software open source.

Diferenta dintre limbajele de programare

demostene — Mon, 01 Mar 2010 18:46:16 +0000

de aici

SQL

demostene — Mon, 15 Feb 2010 09:50:18 +0000

Un site interesant pentru a-ti perfectiona abilitatile legate de SQL. Se foloseste standardul SQL-92, toate interogarile facandu-se pe baza lor de date. E un site fain pentru cei care vor sa ruleze SELECT-uri fara sa instaleze un server propriu.

http://www.sql-ex.ru/