sayhello public private protected return public class Greeter { public String sayhello() { String message = Hello, World! ; return message; } }

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Filippo Arcuri
10 anni fa
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1 sayhello public class Greeter { public String sayhello() { String message = Hello, World! ; return message; publicprivate protected return

2 void return; Greeter main main public class GreeterTest { public static void main(string [] args) { Greeter worldgreeter = new Greeter(); System.out.println(worldGreeter.sayHello());

3 usa usa

4 Greeter sayhello, public class GreeterTest { public static void main(string [] args) { Greeter worldgreeter = new Greeter(); Greeter anothergreeter = new Greeter(); System.out.println(worldGreeter.sayHello()); System.out.println(anotherGreeter.sayHello()); // Stampano entrambi la stessa stringa Greeter private private

Greeter(); System.out.println(worldGreeter.sayHello()); System.out.println(anotherGreeter.

5 Greeter String public class Greeter { private String name; //Variabile Istanza public String sayhello() { String message = Hello, + name +! ; return message; name Greeter public class GreeterTest { public static void main(string [] args) { Greeter worldgreeter = new Greeter(); System.out.println(worldGreeter.name); Greeter

; return message; name Greeter public class GreeterTest { public static void

6 public class NameGreeter { private String name; // Il nome da salutare public NameGreeter() { name = "World"; public NameGreeter(String aname) { name = aname; public String sayhello() { String message = "Hello, " + name + "!"; return message; public class NameGreeterTest { public static void main(string argv[]) { NameGreeter worldgreeter = new NameGreeter(); NameGreeter lucagreeter = new NameGreeter("Luca"); System.out.println(worldGreeter.sayHello()); System.out.println(lucaGreeter.sayHello()); public class NameGreeterTest { public static void main(string argv[]) { NameGreeter worldgreeter = new NameGreeter(); NameGreeter lucagreeter = new NameGreeter( Luca ); System.out.println( worldgreeter.sayhello()); System.out.println(lucaGreeter.sayHello());

"; return message; public class NameGreeterTest { public static void main(string argv[]) { NameGreeter worldgreeter = new NameGreeter(); NameGreeter lucagreeter = new NameGreeter("Luca");

7 public class NameGreeterTest { public static void main(string argv[]) { NameGreeter worldgreeter = new NameGreeter(); NameGreeter lucagreeter = new NameGreeter("Luca"); System.out.println( worldgreeter.sayhello()); System.out.println(lucaGreeter.sayHello()); public class NameGreeterTest { public static void main(string argv[]) { NameGreeter worldgreeter = new NameGreeter(); NameGreeter lucagreeter = new NameGreeter("Luca"); System.out.println(worldGreeter.sayHello()); System.out.println(lucaGreeter.sayHello()); public String sayhello() { String message = "Hello, " + name + "!"; return message; sayhello worldgreeter this

sayHello()); System.out.println(lucaGreeter.sayHello()); public String sayhello() { String message = "Hello, " + name + "!

8 public class NameGreeterTest { public static void main(string argv[]) { NameGreeter worldgreeter = new NameGreeter(); NameGreeter lucagreeter = new NameGreeter("Luca"); System.out.println(worldGreeter.sayHello()); System.out.println(lucaGreeter.sayHello()); this

NameGreeter lucagreeter = new NameGreeter("Luca"); System.out.

9 public String sayhello() { String message = "Hello, " + name + "!"; return message; name this.name this public String sayhello() { String name = "Hello, " + this.name + "!"; return name; this.name name name

10 NameGreeter setname name NameGreeter public class SettableNameGreeter { private String name; // Nome da salutare public SettableNameGreeter() { name = "World!"; // Nome di default public SettableNameGreeter(String aname) { name = aname; public String sayhello() { String message = "Hello, " + name + "!"; return message; public void setname(string newname) { name = newname; setname name name public String getname() { return name; public class SettableNameGreeterTest { public static void main(string argv[]) { SettableNameGreeter mygreeter = new SettableNameGreeter("Pippo"); // Stampa "Hello, Pippo!" System.out.println(myGreeter.sayHello()); mygreeter.setname("pluto"); // Stampa "Hello, Pluto!" System.out.println(myGreeter.sayHello());

"; return message; public void setname(string newname) { name = newname; setname name name public String getname() { return name; public class SettableNameGreeterTest { public static

11 ... public void setname (String name) { this.name = name;... namename this javadoc javadoc C:\Java> javadoc *.java /** Spiegazione di cosa fa la Nome-autore... @return */ /** Spiegazione di cosa rappresenta la variabile istanza */

java /** Spiegazione di cosa fa la classe @autor Nome-autore.

12 /** Spiegazione di cosa fa il nome-parametro1 spiegazione di cosa rappresenta il nome-parametro2 spiegazione di cosa rappresenta il spiegazione di cosa ritorna il metodo */ javadoc /** Un conto bancario ha un saldo che può essere modificato da depositi e prelievi */ public class BankAccount { /** Costruisce un conto bancario con saldo uguale a zero */ public BankAccount() {

metodo */ javadoc /** Un conto bancario ha un saldo che può essere modificato da depositi e prelievi */

13 /** Costruisce un conto bancario con un saldo initialbalance il saldo iniziale */ public BankAccount(double initialbalance) { /** Preleva denaro dal conto amount l'importo da prelevare */ public void withdraw(double amount) { /** Versa denaro nel conto amount l'importo da versare */ public void deposit(double amount) { /** Ispeziona il valore del saldo attuale del conto il saldo attuale */ public double getbalance() { BankAccount javadoc BankAccount

amount) { /** Versa denaro nel conto bancario @param amount l'importo da versare */ public void deposit(double amount) { /**

14 CashRegister String public Letter(String mitt, String dest) public void addline(string linea)

15 public String printletter()

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