public class Hello { public static void main(string[] args){ // visualizza un messaggio sulla finestra di // console System.out.

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2 javac Hello.java javac.exe javac.exe java Hello Hello, World! java.exe java.exe console public

3 HelloWorld InsiemeDiCaratteri ContoPersonalizzato HelloworldHelloWorld HelloWorld class classpublic public staticint int xprintln printlnindicediascolto sommadariportare

4 public class Hello { public static void main(string[] args){ // visualizza un messaggio sulla finestra // di console System.out.println ( Hello, World! ); class class class public public public class NomeClasse {...

5 public static main (String[] args)args main main main main java Hello main main java java

6 // testo del commento // /* testo del commento */ /**/

7 out out out out System System.out outprintstream System.out System.out.println( Hello, World! ); println(string s) PrintStream System.out System.out String String Ciao \t Ciao \n\ Unicode \\u007d\ : \u007d Ciao Ciao Unicode \u007d : \t \n \u007d \ \\ \\

8 println printlnprintstream System.out System.out String String String Hello, World! PrintStream PrintStream println println System.out.println(3+5); // Stampa 8 System.ouch ouch.println( Hello, World! ); javac Hello.java Hello.java:4: : cannot resolve symbol symbol: variable ouch location: class java.lang.system System.ouch.println( Hello, World! ); ^ 1 error

9 System.out.println( Hello, World!); javac Hello.java Hello.java:4: unclosed string literal System.out.println( Hello, World!); ^ Hello.java:5: ) expected ^ 2 errors javac Hello.java public static void Main(String[] args){ java Hello Exception in thread main java.lang.nosuchmethoderror: main main main

10 System.out.println( Hell, World! ); javac Hello.java Hell, World! main Luca

11 import javax.swing.joptionpane; public class DialogViewer { public static void main(string[] args) { JOptionPane.showMessageDialog(null, System.exit(0); Hello, World! ); import javax.swing.joptionpane; public class InputDialogViewer { public static void main(string[] args) { String nome = JOptionPane. showinputdialog( Come ti chiami? ); System.out.println(nome); System.exit(0);