美好的一天，我试图完成删除ArrayList中特定字符串的任务，我认为它已被转换为默认列表？ 但是，我遇到了一些困难，我想知道我做错了什么。 这是在JavaSwing中完成的，我将提供我认为删除它的方法，我相信我的问题是我不会更新列表。
我将提供我的主要jFrame：如果你想要任何其他课程，请告诉我，他们相当长。
package is.hi.torg.vidmot;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package is.hi.torg.vidmot;
import is.hi.torg.gogn.LagaListi;
import is.hi.torg.styring.StyringListi;
import is.hi.torg.vinnsla.FlokkarModel;
import is.hi.torg.vinnsla.LagaListiModel;
import is.hi.torg.vinnsla.TonlistarKatalogur;
import java.util.ArrayList;
import javax.swing.DefaultListModel;
/**
*
* @author Ebba Þóra Hvannberg ebba@hi.is
*/
public class AdalTorg extends javax.swing.JFrame {
private final TonlistarKatalogur minnKatalogur;
public AdgerdTag getAdgerd() {
return adgerd;
}
/**
* @param adgerd the adgerd to set
*/
public void setAdgerd(AdgerdTag adgerd) {
this.adgerd = adgerd;
}
public enum AdgerdTag {SKODA, EYDA, BREYTA};
private AdgerdTag adgerd=AdgerdTag.SKODA;
LagaListi minnLagaListi;
/**
* Creates new form AdalTorg
*/
public AdalTorg() {
initComponents();
// Lesum inn XML gögn með því að smíða TónlistarKatalog
minnKatalogur = new TonlistarKatalogur();
// Birtum lögin
minnKatalogur.birtaLogin();
birtaLag(3);
List.getSelectionModel().addListSelectionListener(new StyringListi(this));
FlokkarModel fModel = new FlokkarModel(minnKatalogur.getFlokkar());
jFlokkar.setModel(fModel.getModel());
LagaListiModel list = new LagaListiModel(minnKatalogur.getLagaListi());
List.setModel(list);
}
public TonlistarKatalogur getTonlistarKatalog(){
return minnKatalogur;
}
private void printO(int i){
jTextArea1.append("Flytjandi: " + minnKatalogur.getLagaListi().get(i).getFlytjandi() + "\n" +
"Lag: " + minnKatalogur.getLagaListi().get(i).getTitill() + "\n" +
"Höfundur: " + minnKatalogur.getLagaListi().get(i).getHofundur() + "\n" +
"Flokkur :" + minnKatalogur.getLagaListi().get(i).getFlokkur().getHeiti() + "\n" +
"Undirflokkur: " + minnKatalogur.getLagaListi().get(i).getUndirflokkur().getHeiti() + "\n\n");
}
private void birtaLag(int indexLag) {
System.out.println ("lag nr. "+(indexLag+1));
System.out.println (
minnKatalogur.getLagaListi().get(indexLag).getTitill());
System.out.println (
minnKatalogur.getLagaListi().get(indexLag).getFlytjandi());
System.out.println (
minnKatalogur.getLagaListi().get(indexLag).getFlokkur().getHeiti());
System.out.println (
minnKatalogur.getLagaListi().get(indexLag).getUndirflokkur().getHeiti());
jTextArea1.setText("XML skrá komin!");
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jFlokkar = new javax.swing.JTree();
jScrollPane2 = new javax.swing.JScrollPane();
List = new javax.swing.JList<>();
jButton1 = new javax.swing.JButton();
jScrollPane3 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
Delete_Me = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jScrollPane1.setViewportView(jFlokkar);
List.setModel(new javax.swing.AbstractListModel<String>() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public String getElementAt(int i) { return strings[i]; }
});
List.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
ListMouseClicked(evt);
}
});
jScrollPane2.setViewportView(List);
jButton1.setText("Ok ");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane3.setViewportView(jTextArea1);
Delete_Me.setText("Delete me");
Delete_Me.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Delete_MeActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(Delete_Me)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 186, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(40, 40, 40)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 267, Short.MAX_VALUE)
.addContainerGap())
.addComponent(jScrollPane3)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jScrollPane2)
.addComponent(jScrollPane1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 56, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(Delete_Me)))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea1.setText("");
jButton1.setVisible(false);
}
private void ListMouseClicked(java.awt.event.MouseEvent evt) {
dialog dlg = new dialog(this,true);
//NamskeidDialog namskeidDialog = new NamskeidDialog (this, true);
}
private void Delete_MeActionPerformed(java.awt.event.ActionEvent evt) {
setAdgerd(AdgerdTag.EYDA);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(AdalTorg.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(AdalTorg.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(AdalTorg.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(AdalTorg.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new AdalTorg().setVisible(true);
}
});
}``
// AdalTorg是主要的JFrame，我唯一想知道的是我做错了什么，我非常肯定我没有在我删除之后更新列表它，如果是这样，我的错误在哪里，我在哪里修复它？
package is.hi.torg.styring;
import is.hi.torg.gogn.LagaListi;
import is.hi.torg.vidmot.AdalTorg;
import is.hi.torg.vidmot.dialog;
import is.hi.torg.vidmot.AdalTorg.AdgerdTag;
import java.util.ArrayList;
import javax.swing.JOptionPane;
import javax.swing.event.ListSelectionListener;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
/**
*
* @author Lenovo
*/
public class StyringListi implements ListSelectionListener{
private AdalTorg TorgAdal;
public StyringListi(AdalTorg Torg){
TorgAdal = Torg;
}
@Override
public void valueChanged (ListSelectionEvent evt) {
ListSelectionModel lsm = (ListSelectionModel)evt.getSource();
AdgerdTag a = TorgAdal.getAdgerd();
int index = lsm.getMinSelectionIndex();
switch(a){
case SKODA:
Printo(index);
break;
case BREYTA:
break;
case EYDA:
EydO(index);
}
TorgAdal.setAdgerd(AdgerdTag.SKODA);
}
private void Printo(int i){
dialog Dialog = new dialog(TorgAdal,true);
Dialog.TextO.append("Flytjandi:"+ TorgAdal.getTonlistarKatalog().getLagaListi().get(i).getFlytjandi()+"\n"+
"Lag: " + TorgAdal.getTonlistarKatalog().getLagaListi().get(i).getTitill() + "\n" +
"Höfundur: " + TorgAdal.getTonlistarKatalog().getLagaListi().get(i).getHofundur() + "\n" +
"Flokkur :" + TorgAdal.getTonlistarKatalog().getLagaListi().get(i).getFlokkur().getHeiti() + "\n" +
"Undirflokkur: " + TorgAdal.getTonlistarKatalog().getLagaListi().get(i).getUndirflokkur().getHeiti() + "\n\n");
Dialog.setVisible(true);
//"Flytjandi: " + minnKatalogur.getLagaListi().get(i).getFlytjandi() + "\n" +
// "Lag: " + minnKatalogur.getLagaListi().get(i).getTitill() + "\n" +
// "Höfundur: " + minnKatalogur.getLagaListi().get(i).getHofundur() + "\n" +
// "Flokkur :" + minnKatalogur.getLagaListi().get(i).getFlokkur().getHeiti() + "\n" +
// "Undirflokkur: " + minnKatalogur.getLagaListi().get(i).getUndirflokkur().getHeiti() + "\n\n");
}
private void EydO(int i){
if (i == -1)
return;
String s = TorgAdal.getTonlistarKatalog().getLagaListi().get(i).getTitill();
if (JOptionPane.showConfirmDialog(TorgAdal, "Viltu eyða námskeiðinu? "+s, "Laginu", JOptionPane.YES_NO_OPTION)==0)
TorgAdal.getTonlistarKatalog().eydaLagi(i);
}
}
//我认为这是控制List的功能。
编辑，此函数假设为DefaultArrayList。
package is.hi.torg.vinnsla;
import is.hi.torg.gogn.LagaListi;
import java.util.ArrayList;
import javax.swing.DefaultListModel;
/**
*
* @author Lenovo
*/
public class LagaListiModel extends DefaultListModel {
public LagaListiModel( ArrayList<LagaListi.Lag> lagaListi){
for(int i = 0; i <lagaListi.size();i++)
{
String s = lagaListi.get(i).getTitill();
this.addElement(s);
}
}
}
And here I call on all the functions, am I doing it incorrectly?
public AdalTorg() {
initComponents();
// Lesum inn XML gögn með því að smíða TónlistarKatalog
minnKatalogur = new TonlistarKatalogur();
// Let's show some songs
minnKatalogur.birtaLogin();
birtaLag(3);
List.getSelectionModel().addListSelectionListener(new StyringListi(this));
FlokkarModel fModel = new FlokkarModel(minnKatalogur.getFlokkar());
jFlokkar.setModel(fModel.getModel());
LagaListiModel list = new LagaListiModel(minnKatalogur.getLagaListi());
List.setModel(list);
}
public TonlistarKatalogur getTonlistarKatalog(){
return minnKatalogur;
}
private void printO(int i){
jTextArea1.append("Flytjandi: " + minnKatalogur.getLagaListi().get(i).getFlytjandi() + "\n" +
"Lag: " + minnKatalogur.getLagaListi().get(i).getTitill() + "\n" +
"Höfundur: " + minnKatalogur.getLagaListi().get(i).getHofundur() + "\n" +
"Flokkur :" + minnKatalogur.getLagaListi().get(i).getFlokkur().getHeiti() + "\n" +
"Undirflokkur: " + minnKatalogur.getLagaListi().get(i).getUndirflokkur().getHeiti() + "\n\n");
}
答案 0 :(得分：2)
变量名称不应以大写字母开头。
方法名称不应以大写字母开头。
班级名称应该以大写字母开头。
类名应该是描述性的。 “对话框”不具有描述性，并且不以大写字母开头。
我正在尝试删除ArrayList中的特定字符串，我认为它已被转换为默认列表？
我甚至没有看到你在代码中使用ArrayList的位置。
我认为这是引导名单的功能。
好吧，如果你不知道你怎么想我们知道？
List.setModel（new javax.swing.AbstractListModel（）
您正在使用不支持remove（）方法的AbstractListModel。使用DefaultListModel。
首先阅读How to Use Lists上的Swing教程中的部分。 ListDemo示例显示了如何从列表中动态添加和删除项目。
下载演示代码并使用它，然后修改代码。