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Oscar [email protected]
Programación interactiva
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El lenguaje de
programación
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Importancia del lenguaje Java•Correspondencia directa con el mundo real (compuestode objetos)
•Permite implementar GUI multimediales•Brinda seguridad en aplicaciones relacionadas con redesde computadores
•Es portable•Es gratis
El lenguaje de programación Java
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•Es un lenguaje interpretado. Los programas se ejecutansobre la máquina virtual
-Portabilidad
-Desempeño
•No se tienen punteros. Los nombres de los objetoscorresponden a las referencias a los objetos
•No soporta la herencia múltiple
El lenguaje de programación Java
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El JDK y su instalación
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El JDK y su instalación
JDK(Java Development Kit)
•Conjunto de herramientas para desarrollarsoftware, en específico aquellos programas
en el lenguaje llamado JAVA
El lenguaje de programación Java
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Herramientas de desarrollo del JDK
El lenguaje de programación Java
CARPETA DESCRIPCIÓNbin Contiene las herramientas ejecutables del JDK
para desarrollar, ejecutar, depurar y
documentar programas en Javademo Contiene Applets para ejecución, así como
muestras de código para la clases de Java
docs Completa documentación acerca de Java
include Archivos de encabezamiento requeridos para laconstrucción del entorno java
lib Bibliotecas y archivos utilizados por el JDK
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Herramientas de desarrollo del JDK
El lenguaje de programación Java
PROGRAMA DESCRIPCIÓN java Interpretador para ejecutar aplicaciones
javac Compilador de Java
javadoc Para la generación de documentación de clases
appletviewer Para visualizar las ventanas de Applets
javah Generador de archivos C++ de encabezados
javap Desensamblador de clases Java jdb Depurador Java
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Desarrollando programas en Java
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Herramientas de desarrollo del JDK
CompiladorJava
El archivo de clase es aquel que contiene latraducción en código de bytes (bytecode)del código fuente
Note que contiene 1’s y 0’s!!!
El lenguaje de programación Java
Código FuenteArchivo de clase(código de bytes)
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Herramientas de desarrollo del JDK
El lenguaje de programación Java
CompiladorJavaCódigo Fuente
Archivo de clase(código de bytes)
JVMPrograma
en ejecución
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En Java se pueden desarrollar dos tipos de programas
• Aplicaciones: programas que se ejecutan localmente enel computador
• Applets: programas que se ejecutan en Internet, pormedio de un navegador o browser
El lenguaje de programación Java
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Ejemplo1.java
El lenguaje de programación Java
CompiladorJavaCódigo Fuente
Archivo de clase(código de bytes)
JVMPrograma
en ejecución
Aplicación
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El lenguaje de programación Java
Ejemplo1.java
CompiladorJavaCódigo Fuente
Archivo de clase(código de bytes)
JVMPrograma
en ejecuciónCompilar:
javac Ejemplo1.java
Aplicación
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Compilar:
javac Ejemplo1.java
El lenguaje de programación Java
Ejemplo1.java
CompiladorJavaCódigo Fuente
Archivo de clase(código de bytes)
JVMPrograma
en ejecución
Ejemplo1.class
Aplicación
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Compilar:
javac Ejemplo1.java
El lenguaje de programación Java
Ejemplo1.java
CompiladorJavaCódigo Fuente
Archivo de clase(código de bytes)
JVMPrograma
en ejecución
Ejemplo1.class
Ejecutar:
java Ejemplo1
Aplicación
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Compilar:
javac Ejemplo1.java
El lenguaje de programación Java
Ejemplo1.java
CompiladorJavaCódigo Fuente
Archivo de clase(código de bytes)
JVMApplet
Ejemplo1.class
Visualizar:
appletviewer Ejemplo1.html
Archivo HTMLEjemplo1.html
Applet
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Aplicaciones
• Es un programa que se ejecuta en un computador demanera local y consta de una o más clases.
• Las aplicaciones tienen un método main()
El lenguaje de programación Java
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Ejemplo1
main()
Toda clase en Java que sea una aplicación debe tener un método llamado main()
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public class Ejemplo1
{
public static void main(String a[])
{
contenido del método main()
}
}
Ejemplo1
main()
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Aplicación requerida
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import javax.swing.JOptionPane;
public class Ejemplo1 {
public static void main(String a[]){
JOptionPane.showMessageDialog(null,"Bienvenido a Java");
System.exit(0);
} }
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JOptionPane.showMessageDialog(null,"Bienvenido a Java");
JOptionPane es una clase AUXILIAR cuyos métodospermiten la entrada y salida de datos.
El método que se utiliza específicamente se llamashowMessageDialog y permite mostrar la siguienteventana:
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JOptionPane
showMessageDialog()
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JOptionPane.showMessageDialog(null,"Bienvenido a Java“,
“Mensaje de bienvenida”, JOptionPane.INFORMATION_MESSAGE);
Título
Tipo de mensaje,se cambia el icono
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JOptionPane.showMessageDialog(null,"Bienvenido a Java“,
“Mensaje de bienvenida”, JOptionPane.INFORMATION_MESSAGE);
(1)
Tipo de mensaje, secambia el icono (2)
Título (1)
(2)
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Tipo de cuadro de dialogo Icono
JOptionPane.ERROR_MESSAGE
JOptionPane.INFORMATION_MESSAGE
JOptionPane.WARNING_MESSAGE
JOptionPane.QUESION_MESSAGE
JOptionPane.PLAIN_MESSAGE
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import javax.swing.JOptionPane;
Permite utilizar la clase JOptionPane que seencuentra en el paquete llamado javax.swing.
Es OBLIGATORIO importar la clase si se va a
utilizar
Dependiendo de qué clases adicionales se van a utilizarse importan diferentes paquetes
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JOptionPaneJButtonJCheckBoxJLabelJListJMenuBar
javax.swing
javax.swing es unpaquete en el que se
almacenan diferentesclases.
•Al utilizar javax.swing.JOptionPane;
se importa la clase
JOptionaPane
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JOptionPaneJButtonJCheckBoxJLabelJListJMenuBar
javax.swing
Utilizar javax.swing.*;
para importar TODASlas clases del paquete
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System
exit()
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System
exit()
JOptionPane
showMessageDialog()
Ejemplo1
main()
usa
usa
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import javax.swing.*;
public class Ejemplo3 {
public static void main(String a[]){
JOptionPane.showMessageDialog(null," Bienvenido a
Java \n Un lenguaje orientado a objetos");
System.exit(0); }
}
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El símbolo \n genera un salto de línea
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Desarrollar una aplicación Java que primero muestreel mensaje
y una vez se de clic en ACEPTAR, aparezca
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Tarea 1 (PARTE 1):Desarrollar una aplicación Javaque muestre los siguientes datos para cada integrante
de su grupo de laboratorio:• Nombre
• Código
• Edad• Promedio
Los datos para cada estudiante deben aparecer en unaventana aparte, es decir, para un grupo de 2 personasaparecerá primero la ventana con los datos del primerestudiante y cuando se de clic en aceptar aparecerálos datos del segundo estudiante
Debe entregar: .java, .class, captura de ejecución
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Applets
• Es un programa que se ejecuta en un navegador obrowser
• Requiere de un archivo HTML que invoque a la claseJava
El lenguaje de programación Java
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JApplet
EjemploA1
Todo programa en Java que sea Applet debe presentar esta
jerarquía de clases
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JApplet
EjemploA1
Superclase
Subclase
EjemploA1 es-un JApplet
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JApplet
EjemploA1
La clase EjemploA1hereda de la claseJApplet.
La herencia seimplementa en Javapor medio de lapalabra extends
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import javax.swing.JApplet;
import java.awt.Graphics;
public class EjemploA1 extends JApplet{
}
Ejemplo4.java
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JApplet
EjemploA1
paint()
Toda applet en Javadebe tener unmétodo paint()
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import javax.swing.JApplet;
import java.awt.Graphics;
public class EjemploA1 extends JApplet{
public void paint(Graphics g){
g.drawString(“Bienvenidos a Java”,10,50);
}
}
EjemploA1.java
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g.drawString(“Bienvenidos a Java”,10,50);
El método drawString permite dibujar unacadena de caracteres en un applet, en lascoordenadas 10,50
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Bienvenidos a Java
10
50
300,200
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<HTML>
<BODY>
<APPLET CODE="EjemploA1.class" WIDTH="300” HEIGHT="200">
</APPLET>
</BODY>
</HTML>
EjemploA1.html
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Desarrolle el siguiente applet en Java:
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Desarrolle el siguiente applet en Java:
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import javax.swing.JApplet;
import java.awt.Graphics;
import java.awt.Color;
public class EjemploA2 extends JApplet{
public void paint(Graphics g){
g.setColor(Color.red);
g.drawString("Bienvenidos a Java",10,50);
}
}
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Desarrolle una programa tipo Applet quemuestre lo siguiente:
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import javax.swing.JApplet;import java.awt.Graphics;import java.awt.Color;
public class EjemploA3 extends JApplet{public void paint(Graphics g){
g.setColor(Color.red);g.drawOval(30,30,90,80);g.drawLine(40,40,80,80);g.fillRect(10,10,50,40);
} }
30
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30
30
300,200
90
80
g.drawOval(30,30,90,80);
40
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40
40
300,200
(80, 80)
g.drawLine(40,40,80,80);
(40, 40)
10
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10
10
300,200
g.fillRect(10,10,50,40);
50
40
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Desarrollar un programa tipoapplet que muestre lo siguiente:
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Tarea 1 (PARTE 2):Desarrollar un applet en Java quemuestre lo siguiente
Debe entregar: .java, .class, .html, captura de ejecución
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Cómo mostrar mensajes en modo texto
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public class Ejemplo11 {
public static void main(String a[]){
System.out.println(“Bienvenido a Java”);
System.exit(0);
}
}
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System.out.println(“Bienvenido a Java”);
Se utiliza la clase System para imprimir enmodo texto el mensaje “Bienvenido a Java”
También se puede utilizar \n para provocar unsalto de línea
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public class Ejemplo12 {
public static void main(String a[]){
System.out.println(“PROGRAMACION INTERACTIVA \n\t 750085M \n \t Creditos:4 \n \t Validable:Si”);
System.exit(0);
}
}
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Se puede utilizar \t para tabular. Es decir,adicionar espacios en blanco a la izquierda deltexto