UNIDAD 5: JAVA ARREGLOS

JAVA TEMA 5: Componente List JAVA

En java este componente permite procesar visualmente un conjunto de elementos de tipo string.

Su primer y mas importante aspecto a recordar, cuando se procese o programe, es que el primer indice de la lista, es el indice numero 0(cero).

Ejemplo:


import java.lang.*; import java.awt.*; import java.awt.event.*;

public class prog22 {

//declaracion, creacion e inicializacion de componentes, objetos y variables

static Frame ventana= new Frame();

static Panel p1= new Panel(); static Panel p2= new Panel();

static List lista1= new List(5); static List lista2= new List(5);

static Label l1 = new Label("DAME EDAD:"); static TextField t1 = new TextField(4);

static Button b1 = new Button("INSERTAR"); static Button b2 = new Button("A meses");

// parte principal de programa

public static void main(String[] args)

{ // area de definicion de propiedades de el objeto

ventana.setTitle("mi programa");

p1.add(l1);p1.add(t1);p1.add(b1);p1.add(lista1);

ventana.add(p1,BorderLayout.NORTH);

p2.add(lista2);p2.add(b2);

ventana.add(p2,BorderLayout.SOUTH);

ventana.pack(); ventana.setVisible(true);

//area de asociacion de objeto-eventos

b1.addMouseListener( new MouseAdapter()

{ public void mousePressed(MouseEvent e){

lista1.add(t1.getText()); }} );

b2.addMouseListener( new MouseAdapter()

{ public void mousePressed(MouseEvent e){

int ren;int temp;

for (ren=0; ren<=4; ren++)

{temp =Integer.parseInt(lista1.getItem(ren));

temp=temp*12;

lista2.add(String.valueOf(temp)); }; }} );

ventana.addWindowListener( new WindowAdapter()

{ public void windowClosing(WindowEvent e){ System.exit(0); }} );

}; // termina main

} // termina clase

Corrida:

image38.jpg

NOTAS:

Conversiones, conversiones, conversiones

recordar que solo podran emplearse en aplicaciones de tipo FRAME Y APPLET.

Este componente, contiene muchas propiedades y métodos que facilitan el trabajo con datos, entre ellas se encuentran:

Constructor Summary
List”()“
Creates a new scrolling list.
List”(int rows)“
Creates a new scrolling list initialized with the specified number of visible lines.
List”(int rows, boolean multipleMode)“
Creates a new scrolling list initialized to display the specified number of rows.
Method Summary
“void” add”(“String “item)“
Adds the specified item to the end of scrolling list.
“void” add”(“String “item, int index)“
Adds the specified item to the the scrolling list at the position indicated by the index.
“void” addActionListener”(“ActionListener “l)“
Adds the specified action listener to receive action events from this list.
“void” addItem”(“String “item)“
Deprecated. replaced by “add(String)”.
“void” addItem”(“String “item, int index)“
Deprecated. replaced by “add(String, int)”.
“void” addItemListener”(“ItemListener “l)“
Adds the specified item listener to receive item events from this list.
“void” addNotify”()“
Creates the peer for the list.
“boolean” allowsMultipleSelections”()“
Deprecated. As of JDK version 1.1, replaced by “isMultipleMode()”.
“void” clear”()“
Deprecated. As of JDK version 1.1, replaced by “removeAll()”.
“int” countItems”()“
Deprecated. As of JDK version 1.1, replaced by “getItemCount()”.
“void” delItem”(int position)“
Deprecated. replaced by “remove(String)” and “remove(int)”.
“void” delItems”(int start, int end)“
Deprecated. As of JDK version 1.1, Not for public use in the future. This method is expected to be retained only as a package private method.
“void” deselect”(int index)“
Deselects the item at the specified index.
AccessibleContext getAccessibleContext”()“
Gets the AccessibleContext associated with this List.
String getItem”(int index)“
Gets the item associated with the specified index.
“int” getItemCount”()“
Gets the number of items in the list.
String”[]” getItems”()“
Gets the items in the list.
EventListener”[]” getListeners”(“Class “listenerType)“
Return an array of all the listeners that were added to the List with addXXXListener(), where XXX is the name of the “listenerType” argument.
Dimension getMinimumSize”()“
Determines the minimum size of this scrolling list.
Dimension getMinimumSize”(int rows)“
Gets the minumum dimensions for a list with the specified number of rows.
Dimension getPreferredSize”()“
Gets the preferred size of this scrolling list.
Dimension getPreferredSize”(int rows)“
Gets the preferred dimensions for a list with the specified number of rows.
“int” getRows”()“
Get the number of visible lines in this list.
“int” getSelectedIndex”()“
Gets the index of the selected item on the list,
“int[]” getSelectedIndexes”()“
Gets the selected indexes on the list.
String getSelectedItem”()“
Get the selected item on this scrolling list.
String”[]” getSelectedItems”()“
Get the selected items on this scrolling list.
Object”[]” getSelectedObjects”()“
Returns the selected items on the list in an array of Objects.
“int” getVisibleIndex”()“
Gets the index of the item that was last made visible by the method “makeVisible”.
“boolean” isIndexSelected”(int index)“
Determines if the specified item in this scrolling list is selected.
“boolean” isMultipleMode”()“
Determines whether this list allows multiple selections.
“boolean” isSelected”(int index)“
Deprecated. As of JDK version 1.1, replaced by “isIndexSelected(int)”.
“void” makeVisible”(int index)“
Makes the item at the specified index visible.
Dimension minimumSize”()“
Deprecated. As of JDK version 1.1, replaced by “getMinimumSize()”.
Dimension minimumSize”(int rows)“
Deprecated. As of JDK version 1.1, replaced by “getMinimumSize(int)”.
“protected” String paramString”()“
Returns the parameter string representing the state of this scrolling list.
Dimension preferredSize”()“
Deprecated. As of JDK version 1.1, replaced by “getPreferredSize()”.
Dimension preferredSize”(int rows)“
Deprecated. As of JDK version 1.1, replaced by “getPreferredSize(int)”.
“protected void” processActionEvent”(“ActionEvent “e)“
Processes action events occurring on this component by dispatching them to any registered “ActionListener” objects.
“protected void” processEvent”(“AWTEvent “e)“
Processes events on this scrolling list.
“protected void” processItemEvent”(“ItemEvent “e)“
Processes item events occurring on this list by dispatching them to any registered “ItemListener” objects.
“void” remove”(int position)“
Remove the item at the specified position from this scrolling list.
“void” remove”(“String “item)“
Removes the first occurrence of an item from the list.
“void” removeActionListener”(“ActionListener “l)“
Removes the specified action listener so that it no longer receives action events from this list.
“void” removeAll”()“
Removes all items from this list.
“void” removeItemListener”(“ItemListener “l)“
Removes the specified item listener so that it no longer receives item events from this list.
“void” removeNotify”()“
Removes the peer for this list.
“void” replaceItem”(“String “newValue, int index)“
Replaces the item at the specified index in the scrolling list with the new string.
“void” select”(int index)“
Selects the item at the specified index in the scrolling list.
“void” setMultipleMode”(boolean b)“
Sets the flag that determines whether this list allows multiple selections.
“void” setMultipleSelections”(boolean b)“
Deprecated. As of JDK version 1.1, replaced by “setMultipleMode(boolean)”.

TABLAS TOMADAS DEL API DE JAVA

TAREAS JAVA

1.- EN JAVA CAPTURAR EN UNA LISTA LOS SUELDOS DE 6 EMPLEADOS Y DESPLEGARLOS EN UNA SEGUNDA LISTA AUMENTADOS EN UN 30% ( java frame )

2.- EN JAVA CAPTURAR EN UNA LISTA LOS PESOS EN KILOGRAMOS DE 6 PERSONAS DESPLEGARLOS EN UNA SEGUNDA LISTA CONVERTIDOS A LIBRAS Y ADEMAS SOLO LOS MAYORES DE 100 LIBRAS. ( java applet )

3.- EN JAVA CAPTURAR EN SUS 4 LISTAS RESPECTIVAS MATRICULA, NOMBRE Y DOS CALIFICACIONES DE 5 ALUMNOS, DESPUÉS CALCULAR UNA LISTA DE PROMEDIOS DE CALIFICACIONES. ( java frame )

4.-EN JAVA CAPTURAR EN SUS LISTAS RESPECTIVAS NUMEMPLEADO, NOMEMPLEADO, DÍAS TRABAJADOS Y SUELDO DIARIO DE 5 EMPLEADOS, DESPLEGAR EN OTRA PANTALLA O PANEL LA NOMINA PERO SOLO DE AQUELLOS EMPLEADOS QUE GANAN MAS DE $300.00 A LA SEMANA.( java applet )

 


 


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