Bom dia,
criei um programa para que seja cadastrado livros contendo nome, autor e resumo. É criada uma interface gráfica através do swing e os livros cadastrados são armazenados em um arquivo.txt.
Gostaria de implementar uma pesquisa nos livros cadastrados e para isso pensei em armazenar as informações dos livros em um vetor (mantendo o arquivo.txt). Só não sei como faço isso, pois eu teria que criar um vetor do tipo Livro, mas e como farei a estrutura para que sejam armazenadas os de nome, autor e resumo na posição i.
public class Livro {
public String nome;
public String autor;
public String resumo;
}
public class CadastroAndPesquisa extends javax.swing.JFrame {
/**
* Creates new form Cadastro
*/
public CadastroAndPesquisa() {
initComponents();
}
/**
* 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() {
jPanel1 = new javax.swing.JPanel();
lb2 = new javax.swing.JLabel();
lb3 = new javax.swing.JLabel();
lb4 = new javax.swing.JLabel();
txt1 = new javax.swing.JTextField();
txt2 = new javax.swing.JTextField();
txt3 = new javax.swing.JTextField();
btn1 = new javax.swing.JButton();
lb1 = new javax.swing.JLabel();
btn2 = new javax.swing.JButton();
lb5 = new javax.swing.JLabel();
lb6 = new javax.swing.JLabel();
txt4 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
lb2.setText("Título:");
lb3.setText("Autor:");
lb4.setText("Resumo:");
txt1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
txt1ActionPerformed(evt);
}
});
txt3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
txt3ActionPerformed(evt);
}
});
btn1.setText("Cadastra");
btn1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btn1ActionPerformed(evt);
}
});
lb1.setText("Cadastro de Livros");
btn2.setText("Pesquisar");
lb5.setText("Pesquisa de Livros");
lb6.setText("Título:");
jLabel1.setText("====================================================");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(149, 149, 149)
.addComponent(lb1))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(157, 157, 157)
.addComponent(lb5)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lb2)
.addGap(5, 5, 5)
.addComponent(txt1))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lb3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txt2))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(lb4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(btn1)
.addComponent(txt3, javax.swing.GroupLayout.PREFERRED_SIZE, 337, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lb6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txt4)))))
.addContainerGap())
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(157, 157, 157)
.addComponent(btn2)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lb1)
.addGap(5, 5, 5)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lb2)
.addComponent(txt1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lb3)
.addComponent(txt2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(txt3, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btn1))
.addComponent(lb4))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 9, Short.MAX_VALUE)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lb5)
.addGap(2, 2, 2)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lb6)
.addComponent(txt4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btn2)
.addGap(68, 68, 68))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void txt3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void btn1ActionPerformed(java.awt.event.ActionEvent evt) {
Livro livro = new Livro();
livro.nome = (txt1.getText());
livro.autor = (txt2.getText());
livro.resumo = (txt3.getText());
try{
FileOutputStream arquivo = new FileOutputStream("livros.txt", true);
PrintWriter pr = new PrintWriter(arquivo);
pr.println(livro.nome + " | " + livro.autor + " | " + livro.resumo);
pr.close();
arquivo.close();
}
catch(Exception e){
System.out.println("Erro ao escrever arquivo livros.txt");
}
txt1.setText("");
txt2.setText("");
txt3.setText("");
}
private void txt1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @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(CadastroAndPesquisa.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(CadastroAndPesquisa.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(CadastroAndPesquisa.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(CadastroAndPesquisa.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 CadastroAndPesquisa().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btn1;
private javax.swing.JButton btn2;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel lb1;
private javax.swing.JLabel lb2;
private javax.swing.JLabel lb3;
private javax.swing.JLabel lb4;
private javax.swing.JLabel lb5;
private javax.swing.JLabel lb6;
private javax.swing.JTextField txt1;
private javax.swing.JTextField txt2;
private javax.swing.JTextField txt3;
private javax.swing.JTextField txt4;
// End of variables declaration
}