好的，所以在我正在处理的工作中，我有一个文件说明了注释，下面是我写的代码。我认为除了覆盖ToString方法之外我对一切都很好。我想我开始行好，我只是想弄清楚如何让输出结束。
这些是说明：
// Instruction 4
//TODO: Override the toString() method to return the account number,
// account name, and account balance. The returned string should look
// like:
// Account: 10001 - General Expenses
// Balance: 450.67
这是我到目前为止所做的：
public String toString(){
return "Accounts: " + accountNumber + " " + accountName + " " + accountBalance;
以下是名为Account.java的整个文件：
// TODO: Add your name as a comment at the top of the code.
// Gary Hicks - CIT2551
/*
* 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 finalexam;
import java.math.BigDecimal;
/**
*
* @author duvalls
*/
public class Account {
private String accountNumber, accountName;
private BigDecimal accountBalance;
public Account(){
accountNumber = "";
accountName = "";
accountBalance = new BigDecimal("0");
}
// Instruction 2 - create an overloaded constructor
// TODO: Create an overloaded constructor that accepts parameters for
// AccountNumber, AccountName, and AccountBalance. Assign the parameter
// values to the corresponding private variables.
public Account(String accountNumber, String accountName, BigDecimal accountBalance)
{
this.accountNumber = accountNumber;
this.accountName = accountName;
this.accountBalance = accountBalance;
}
// Instruction 3 - create get and set methods for the properties.
//************************************************************************
// TODO: Create getAccountNumber method to return the value of the private
// accountNumber variable.
public String getAccountNumber(){
return accountNumber;
}
//TODO: Create a setAccountNumber method that does not return a value and
// accepts a String parameter. Assign the parameter's value to the
// private accountNumber variable.
public void setAccountNumber ( String n ){
accountNumber = n;
}
//************************************************************************
// TODO: Create getAccountName method to return the value of the private
// accountName variable.
public String getAccountName(){
return accountName;
}
//TODO: Create a setAccountName method that does not return a value and
// accepts a String parameter. Assign the parameter's value to the
// private accountName variable.
public void setAccountName ( String n ){
accountName = n;
}
//************************************************************************
// TODO: Create getAccountBalance method to return the value of the private
// accountBalance variable.
public BigDecimal getAccountBalance(){
return accountBalance;
}
//TODO: Create a setAccountBalance method that does not return a value and
// accepts a BigDecimal parameter. Assign the parameter's value to the
// private accountBalance variable.
public void setAccountBalance ( BigDecimal n ){
accountBalance = n;
}
// Instruction 4
//TODO: Override the toString() method to return the account number,
// account name, and account balance. The returned string should look
// like:
// Account: 10001 - General Expenses
// Balance: 450.67
public String toString(){
return "Accounts: " + accountNumber + " " + accountName + " " + accountBalance;
}
}
这是另一个名为AccountJFrame.java的文件：
/*
* 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 finalexam;
import java.math.BigDecimal;
import javax.swing.JOptionPane;
import java.util.ArrayList;
/**
*
* @author duvalls
*/
public class AccountJFrame extends javax.swing.JFrame {
ArrayList <Account> myAccounts = new ArrayList();
/**
* Creates new form AccountJFrame
*/
public AccountJFrame() {
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">//GEN-BEGIN:initComponents
private void initComponents()
{
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
createAccountButton = new javax.swing.JButton();
listAccountsButton = new javax.swing.JButton();
exitButton = new javax.swing.JButton();
jPanel1 = new javax.swing.JPanel();
accountNumberTextField = new javax.swing.JTextField();
accountNameTextField = new javax.swing.JTextField();
accountBalanceTextField = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Final Exam");
jLabel1.setText("Account No:");
jLabel2.setText("Account name:");
jLabel3.setText("Account balance:");
createAccountButton.setText("Create Account");
createAccountButton.addMouseListener(new java.awt.event.MouseAdapter()
{
public void mouseClicked(java.awt.event.MouseEvent evt)
{
createAccountButtonMouseClicked(evt);
}
});
listAccountsButton.setText("List Accounts");
listAccountsButton.addMouseListener(new java.awt.event.MouseAdapter()
{
public void mouseClicked(java.awt.event.MouseEvent evt)
{
listAccountsButtonMouseClicked(evt);
}
});
exitButton.setText("Exit");
exitButton.addMouseListener(new java.awt.event.MouseAdapter()
{
public void mouseClicked(java.awt.event.MouseEvent evt)
{
exitButtonMouseClicked(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(accountNumberTextField, javax.swing.GroupLayout.DEFAULT_SIZE, 127, Short.MAX_VALUE)
.addComponent(accountBalanceTextField)
.addComponent(accountNameTextField, javax.swing.GroupLayout.Alignment.TRAILING))
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap(14, Short.MAX_VALUE)
.addComponent(accountNumberTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(accountNameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(accountBalanceTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(30, 30, 30))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(27, 27, 27)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addComponent(jLabel2)
.addComponent(jLabel3))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanel1, 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.LEADING, false)
.addComponent(createAccountButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(exitButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(listAccountsButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(20, 20, 20)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(createAccountButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(listAccountsButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(exitButton))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>//GEN-END:initComponents
private void createAccountButtonMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_createAccountButtonMouseClicked
// Instruction 5
// TODO: Create a BigDecimal variable named balance and
// assign the account balance entered in the TextField to it.
//Instruction 6
//TODO: Create an instance of the Account class named myAccount by calling the overloaded
// constructor and passing the entry made in the Account Number
// and Account Name TextFields and the balance BigDecimal variable.
//Instruction 7
//TODO: Use JOptionPane to show a message that contains the results
// of calling the myAccount.toString() method.
// Instruction 8
//TODO: Add myAccount to the myAccounts ArrayList
// Instruction 9
//TODO: Clear the TextField controls
}//GEN-LAST:event_createAccountButtonMouseClicked
private void listAccountsButtonMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_listAccountsButtonMouseClicked
String allAccounts = "";
//Instruction 10
//TODO: Loop through the myAccounts ArrayList. Inside of the loop, add the result returned
// from calling the toString() method for each Account object in the ArrayList
// to the allAccounts String variable.
JOptionPane.showMessageDialog(this, allAccounts, "Account List",
JOptionPane.INFORMATION_MESSAGE);
}//GEN-LAST:event_listAccountsButtonMouseClicked
private void exitButtonMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_exitButtonMouseClicked
// TODO: Add code to close the application
System.exit(0);
}//GEN-LAST:event_exitButtonMouseClicked
/**
* @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(AccountJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(AccountJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(AccountJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(AccountJFrame.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 AccountJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JTextField accountBalanceTextField;
private javax.swing.JTextField accountNameTextField;
private javax.swing.JTextField accountNumberTextField;
private javax.swing.JButton createAccountButton;
private javax.swing.JButton exitButton;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JButton listAccountsButton;
// End of variables declaration//GEN-END:variables
}
答案 0 :(得分：2)
在长评论线程之后进行编辑找出问题：你需要创建一个新的Account实例，设置值，然后以某种方式调用它上面的toString，输出到你可以看到的地方。如新添加的说明6和7中所述。
这不是你的实际问题，但你应该在你所覆盖的方法上使用@Override注释。也就是说，你的IDE应该告诉你这个。
@Override
public String toString(){
return "Accounts: " + accountNumber + " " + accountName + " " + accountBalance;
我将继续编辑实际的字符串，以便它符合你的作业。