java - Arraylist 和 Jframe
问题描述
我arrays在这个项目中遇到问题。我必须保存各自班级的所有学生和教师，特别是在这种情况下，我需要能够添加教师并将其从各自班级中删除，同时显示每个班级的信息。AulasColegio是ArrayList我存储所有课程的地方，Profesores 和老师一样。问题是，ArrayList在主类中添加类，我认为它不会在JFrame. 我所有的问题都与在哪里添加老师和班级有关，以及如何让他们JFrame也加入进来，反之亦然。我真的很感激一些解决方案。
import javax.swing.JOptionPane;
/**
*
*
*/
public class ventDirector extends javax.swing.JFrame {
/**
* Creates new form ventDirector
*/
public ventDirector() {
initComponents();
this.setLocationRelativeTo(null);
}
/**
* 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() {
jLabel1 = new javax.swing.JLabel();
txtClase = new javax.swing.JTextField();
bttInfoClase = new javax.swing.JButton();
bttAlta = new javax.swing.JButton();
bttBaja = new javax.swing.JButton();
txtProfesor = new javax.swing.JTextField();
txtClaseProfesor = new javax.swing.JTextField();
bttAtras = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Información clase");
txtClase.setText("Introduzca nombre de la clase");
bttInfoClase.setText("GO");
bttInfoClase.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
bttInfoClaseMouseClicked(evt);
}
});
bttInfoClase.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bttInfoClaseActionPerformed(evt);
}
});
bttAlta.setText("Alta profesor");
bttAlta.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
bttAltaMouseClicked(evt);
}
});
bttAlta.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bttAltaActionPerformed(evt);
}
});
bttBaja.setText("Baja profesor");
bttBaja.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
bttBajaMouseClicked(evt);
}
});
txtProfesor.setText("Nombre profesor");
txtProfesor.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
txtProfesorActionPerformed(evt);
}
});
txtClaseProfesor.setText("Nombre clase");
bttAtras.setIcon(new javax.swing.ImageIcon(getClass().getResource("/sudoku/back-arrow_icon-icons.com_72866 (1).png"))); // NOI18N
bttAtras.setContentAreaFilled(false);
bttAtras.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
bttAtrasMouseClicked(evt);
}
});
bttAtras.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bttAtrasActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(92, 92, 92)
.addComponent(bttAlta)
.addGap(53, 53, 53)
.addComponent(bttBaja))
.addGroup(layout.createSequentialGroup()
.addGap(54, 54, 54)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 107, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(txtClase, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(bttInfoClase))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(txtClaseProfesor, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(txtProfesor, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 95, Short.MAX_VALUE))))
.addGroup(layout.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(bttAtras, javax.swing.GroupLayout.PREFERRED_SIZE, 47, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(46, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap(74, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(txtClase, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(bttInfoClase))
.addGap(50, 50, 50)
.addComponent(txtProfesor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(txtClaseProfesor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(bttBaja)
.addComponent(bttAlta))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(bttAtras, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(17, 17, 17))
);
pack();
}// </editor-fold>
private void bttInfoClaseActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void bttInfoClaseMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
boolean flag =false;
for(int i =0; i<aulasColegio.size();i++){
if (aulasColegio.get(i).getNombreClase() == txtClase.getText()){
JOptionPane.showMessageDialog(this, aulasColegio.get(i).getNombreClase()+ "\n" +
aulasColegio.get(i).getProfesores()+ "\n" + aulasColegio.get(i).getAlumnos() + aulasColegio.get(i).getNumAlumnos());
flag =true;
}
}
if (flag = false) JOptionPane.showMessageDialog(this,"No existe la clase");
}
private void txtProfesorActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void bttAltaActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void bttAltaMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
boolean flag =false;
Profesor profe = new Profesor(txtProfesor.getText());
for(int i =0; i<aulasColegio.size();i++){
if (aulasColegio.get(i).getNombreClase() == txtClase.getText()){
aulasColegio.get(i).anadeProfesor(profe);
JOptionPane.showMessageDialog(this, "Añadido con éxito");
flag =true;
}
else JOptionPane.showMessageDialog(this, "No es esta clase");
}
if (flag = false) JOptionPane.showMessageDialog(this, "Ese profesor no se encuentra en la clase");
}
private void bttBajaMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
boolean flag =false;
for(int i =0; i<aulasColegio.size();i++){
if (aulasColegio.get(i).getNombreClase() == txtClase.getText()){
for(int j = 0; j<profesores.size(); j++){
if (profesores.get(j).getProfesor() == txtProfesor.getText()){
aulasColegio.get(i).eliminaProfesor(profesores.get(j));
JOptionPane.showMessageDialog(this, "Eliminado con éxito");
flag= true;
}
}
}
}
if (flag = false) JOptionPane.showMessageDialog(this, "Ese profesor no se encuentra en la clase");
}
private void bttAtrasActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void bttAtrasMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
login_1 L = new login_1();
L.setVisible(true);
dispose();
}
/**
* @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(ventDirector.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ventDirector.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ventDirector.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ventDirector.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ventDirector().setVisible(true);
}
});
}
private ArrayList<Clase> aulasColegio = new ArrayList<Clase>();
private ArrayList<Profesor> profesores = new ArrayList<Profesor>();
// Variables declaration - do not modify
private javax.swing.JButton bttAlta;
private javax.swing.JButton bttAtras;
private javax.swing.JButton bttBaja;
private javax.swing.JButton bttInfoClase;
private javax.swing.JLabel jLabel1;
private javax.swing.JTextField txtClase;
private javax.swing.JTextField txtClaseProfesor;
private javax.swing.JTextField txtProfesor;
// End of variables declaration
}
主课还没有结束。
import java.util.ArrayList;
/**
*
* @author
*/
public class SudokuNino {
private String nombreColegio;
private String nombreDirector;
private ArrayList<Clase> aulasColegio = new ArrayList<Clase>();
//private Partida[] partidas;
public void SudokuNiño(){};
/*EXCEPCION */
public void SudokuNiño(String c, String d){
this.nombreColegio= c;
this.nombreDirector= d;
};
public static void main(String[] args) {
// TODO code application logic here
SudokuNino main = new SudokuNino();
Clase clase1 = new Clase("girasoles");
main.aulasColegio.add(clase1);
}
}
解决方案
你永远不会在你的列表中添加任何东西aulasColegio。原因很简单。当你从类中启动 main 时，ventDirector它会像你想要的那样打开 GUI。在每个按钮事件上，您都有以下 for 循环：
for(int i = 0; i<aulasColegio.size();i++){
...
}
如果 ArrayList 为空，则此 for 循环将永远不会运行！它总是空的。教授也一样。我没有看到您的单个profesores.add()或aulasColegio.add()整个代码。所以当然什么都不会发生。代码按预期运行。
在类的情况下SudokuNino。它创建了一些对象并完成，但没有其他任何事情发生。不知道为什么要添加这段代码。
一些提示：
- 使用英语。不要在编码中使用其他语言，这也将有助于其他人理解您的代码。我不知道
ñ会如何影响代码，但我可以肯定地说我永远不会用德语（我的母语）编程 - 使用 System.out.println() 调试您的代码或 IDE 中的调试器，这对您理解代码有很大帮助。你会看到你的数组总是空的。您必须先以某种方式添加一些元素，然后才能迭代它。
而不是
==在字符串比较（或对象比较）中，您必须使用equals：String test=new String("hello"); String test2=new String("hello"); System.out.println(test == test2); System.out.println(test.equals(test2));输出：
false true
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