Java
public class Hello Hello (class) (field)... (method)... Java main Hello World(Hello.java) public class Hello { public static void main(string[ ] args) {
public() (package) Hello World(Hello.java) public class Hello { public static void main(string[ ] args) { Java main
Java 1 class Hello, Hello.java Java main Hello World(Hello.java) public class Hello { public static void main(string[ ] args) {
main public static void main(string[] args) main Java VM(Virtual Machine) main main 1 Java main (Hello.java) public class Hello { public static void main(string[ ] args) {
main static() (instance) void, String (type) main void args String Java main (Hello.java) public class Hello { public static void main(string[ ] args) {
main (Hello.java)!! Java main public class Hello { public static void main(string[ ] args) {
(double quote) " " ( Hello, World!!) (argument) System.out.println ; ( ;semi-colon) Java main (Hello.java) public class Hello { public static void main(string[ ] args) {
(double quote) " " ( Hello, World!!) (argument) System.out.println ; ( ;semi-colon) Java main (Hello.java) public class Hello { public static void main(string[ ] args) {
(double quote) " " ( Hello, World!!) (argument) System.out.println ; ( ;semi-colon) Java main (Hello.java) public class Hello { public static void main(string[ ] args) {
(double quote) " " ( Hello, World!!) (argument) System.out.println ; ( ;semi-colon) Java main (Hello.java) public class Hello { public static void main(string[ ] args) {
{ Hello 1 { 5 main 2 { 4 (Hello.java) Java main public class Hello { public static void main(string[ ] args) {
ErrEx1.java ErrEx6.java (ErrEx1.java) Java public class ErrEx { public static void main(string[ ] args) {
ErrEx1.java ErrEx6.java (ErrEx2.java) Java public class ErrEx2 { public static void main(string[ ] args) { System.out.println("Hello, World!!")
ErrEx1.java ErrEx6.java (ErrEx3.java) Java public class ErrEx3 { public static void main(string[ ] args) {
ErrEx1.java ErrEx6.java (ErrEx4.java) Java public class ErrEx4 { public static void main(string[ ] args) {
ErrEx1.java ErrEx6.java (ErrEx5.java) Java public class ErrEx5 { public static void main(string[ ] args) { System.out.print1n("Hello, World!!");
ErrEx1.java ErrEx6.java (ErrEx6.java) Java public class ErrEx6 { public static void main(string[ ] args) { System.out (println("hello, World!!");
Java Hello.java
(Applet) HelloApplet.java Hello, World!! Java applet(helloapplet.java) import javax.swing.japplet; import java.awt.graphics; public class HelloApplet extends JApplet { public void paint(graphics g) { g.drawstring("hello, World!!", 10, 10); Java? HTML Applet? IE(Internet Explore), Mozilla Web browser
(Applet) HelloApplet.java Hello, World!! Java applet(helloapplet.java) import javax.swing.japplet; import java.awt.graphics; public class HelloApplet extends JApplet { public void paint(graphics g) { g.drawstring("hello, World!!", 10, 10); Java? HTML Applet? IE(Internet Explore), Mozilla Web browser
(Applet) Applet > javac HelloApplet.java web browser(ie ) html appletviewer > appletviewer HelloApplet.html Java? HTML HelloApplet.java html (HelloApplet.html) <html> <applet code="helloapplet.class" width=100 height=30> </applet> </html>
(Applet) Applet > javac HelloApplet.java web browser(ie ) html appletviewer > appletviewer HelloApplet.html Java? HTML HelloApplet.java html (HelloApplet.html) <html> <applet code="helloapplet.class" width=100 height=30> </applet> </html>
(Applet) Applet > javac HelloApplet.java web browser(ie ) html appletviewer > appletviewer HelloApplet.html Java? HTML HelloApplet.java html (HelloApplet.html) <html> <applet code="helloapplet.class" width=100 height=30> </applet> </html>
HelloApplet.java import (1,2 ) javax.swing JApplet java.awt Graphics Java? HTML import javax.swing.japplet; import java.awt.graphics; public class HelloApplet extends JApplet { public void paint(graphics g) { g.drawstring("hello, World!!", 10, 10);
HelloApplet.java extends JApplet(4 ) JApplet ( ) applet Java? HTML import javax.swing.japplet; import java.awt.graphics; public class HelloApplet extends JApplet { public void paint(graphics g) { g.drawstring("hello, World!!", 10, 10);
HelloApplet.java paint (5 ) applet main browser g: Java? HTML import javax.swing.japplet; import java.awt.graphics; public class HelloApplet extends JApplet { public void paint(graphics g) { g.drawstring("hello, World!!", 10, 10);
HelloApplet.java drawstring (6 ) drawstring(string str, int x, int y) str (x, y) : "(double quatation) g.drawstring() g Java? HTML import javax.swing.japplet; import java.awt.graphics; public class HelloApplet extends JApplet { public void paint(graphics g) { g.drawstring("hello, World!!", 10, 10);
O 10 20 30 40 50 x Java 10? 20 HTML 30 40 50 y
HTML(Hyper Text Markup Language) HTML Web page < > < / > <html> </html> html <applet> </applet> code="" width height Java? HTML HelloApplet.java html (HelloApplet.html) <html> <applet code="helloapplet.class" width=100 height=30> </applet> </html>