public class App {
public static void main(String[] args) {
// Ineficient
String info = "";
info += "Numele meu este Popescu.";
info += " ";
info += "Eu sunt un constructor.";
System.out.println(info);
// Eficient.
StringBuilder sb = new StringBuilder("");
sb.append("Numele meu este Elena.");
sb.append(" ");
sb.append("Eu sunt profesoara de Java.");
System.out.println(sb.toString());
// La fel ca mai sus dar mai frumos scris
StringBuilder s = new StringBuilder();
s.append("Numele meu este Alex.")
.append(" ")
.append("Eu sunt aviator.");
System.out.println(s.toString());
///// Formatarea //////////////////////////////////
// Iesire linii noi si file
System.out.print("Aici este un text.\tAceasta a fost o fila.\nAceasta a fost o linie noua.");
System.out.println(" Mai mult text.");
// Formatarea numerelor intregi
// %-10d inseamna: scoateti un nr.intreg intr-un spatiu de zece caractere
// padding cu spatiu si aliniere la stanga (%10d s-ar alinia la dreapta)
System.out.printf("Cost total %-10d; cantitatea este %d\n", 5, 120);
// Demonstrarea secvențelor de control pentru formatarea //întregului și a șirurilor
for(int i=0; i<20; i++) {
System.out.printf("%-2d: %s\n", i, "aici este ceva text");
}
// Formatarea valorii în virgulă mobilă
// Doua zecimale
System.out.printf("Valoarea totala: %.2f\n", 5.6874);
// O zecimală, aliniată la stânga într-un câmp de 6 caractere:
System.out.printf("Valoarea totala: %-6.1f\n", 343.23423);
//De asemenea, putem utiliza metoda String.format() daca dorim sa prelucram
// un sir formatat.
String formatted = String.format("Aceasta este o valoare în virgulă mobilă: %.3f", 5.12345);
System.out.println(formatted);
//Utilizați tipul de date double %% pentru a afișa semnul %.
System.out.printf("Sa oferim %d%% este fizic imposibil.", 100);
}
}
Output is:
Numele meu este Popescu. Eu sunt un constructor.
Numele meu este Elena. Eu sunt profesoara de Java.
Numele meu este Alex. Eu sunt aviator.
Aici este un text. Aceasta a fost o fila.
Aceasta a fost o linie noua. Mai mult text.
Cost total 5 ; cantitatea este 120
0 : aici este ceva text
1 : aici este ceva text
2 : aici este ceva text
3 : aici este ceva text
4 : aici este ceva text
5 : aici este ceva text
6 : aici este ceva text
7 : aici este ceva text
8 : aici este ceva text
9 : aici este ceva text
10: aici este ceva text
11: aici este ceva text
12: aici este ceva text
13: aici este ceva text
14: aici este ceva text
15: aici este ceva text
16: aici este ceva text
17: aici este ceva text
18: aici este ceva text
19: aici este ceva text
Valoarea totala: 5,69
Valoarea totala: 343,2
Aceasta este o valoare în virgulă mobilă: 5,123
Sa oferim 100% este fizic imposibil.
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