在我回到学校之前，我正在快速设置密码管理员。我不在乎它使用字符串以纯文本形式存储密码......这不是重点。
我需要一些帮助是在我的第二个JFrame窗口中我想在用户点击JButton时显示密码，＆＃34;网站名称＆＃34; （我正在使用地图）。但是，我无法让任何按钮在第二个JFrame窗口中执行任何操作。
这是代码。这只是视图类。我不相信模型或控制器适用于此。
import java.awt.Cursor;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import components.simplereader.SimpleReader;
import components.simplereader.SimpleReader1L;
/**
* View class.
*
* @author Redacted
*/
@SuppressWarnings("serial")
public final class PasswordManagerView1 extends JFrame
implements PasswordManagerView {
//controller
private PasswordManagerController controller;
/**
* GUI widgets that need to be in scope in actionPerformed method, and
* related constants. (Each should have its own Javadoc comment, but these
* are elided here to keep the code shorter.)
*/
private static final int ROWS_IN_BUTTON_PANEL_GRID = 1,
COLUMNS_IN_BUTTON_PANEL_GRID = 2, KEY_LENGTH = 10,
VALUE_LENGTH = 15;
// JLabels
private final JLabel keyText, valueText;
// JTextFields
private final JTextField key, value;
// JButtons
private final JButton resetButton, enterButton, recallButton, testButton;
//constructor
public PasswordManagerView1() {
//JFrame title
super("Password Manager");
//widgets
this.testButton = new JButton("Test Button");
this.recallButton = new JButton("Recall");
this.valueText = new JLabel("Enter password here",
SwingConstants.CENTER);
this.keyText = new JLabel("Enter store here", SwingConstants.CENTER);
this.key = new JTextField(KEY_LENGTH);
this.value = new JTextField(VALUE_LENGTH);
this.resetButton = new JButton("Reset");
this.enterButton = new JButton("Enter");
//Button panel
JPanel buttonPanel = new JPanel(new GridLayout(
ROWS_IN_BUTTON_PANEL_GRID, COLUMNS_IN_BUTTON_PANEL_GRID));
//Add to button panel
buttonPanel.add(this.resetButton);
buttonPanel.add(this.enterButton);
//Grid layout
this.setLayout(new GridLayout(0, 2, 5, 0));
//Add to layout
this.add(this.key);
this.add(this.value);
this.add(this.keyText);
this.add(this.valueText);
this.add(this.resetButton);
this.add(this.enterButton);
this.add(this.recallButton);
this.add(this.testButton);
//observers
this.resetButton.addActionListener(this);
this.enterButton.addActionListener(this);
this.key.addActionListener(this);
this.value.addActionListener(this);
this.testButton.addActionListener(this);
//Pack up
this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
/**
* Register argument as observer/listener of this.
*
* @param controller
* controller to register
*/
@Override
public void registerObserver(PasswordManagerController controller) {
this.controller = controller;
}
/**
* Updates key display based on String provided as argument.
*
* @param key
* new value of input display
*/
@Override
public void updateKeyDisplay(String key) {
this.key.setText(key);
}
/**
* Updates value display based on String provided as argument.
*
* @param value
* new value of output display
*/
@Override
public void updateValueDisplay(String value) {
this.value.setText(value);
}
@Override
public void actionPerformed(ActionEvent event) {
//Wait cursor
this.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
//What button was pressed
Object source = event.getSource();
if (source == this.resetButton) {
this.controller.processResetEvent();
} else if (source == this.enterButton) {
this.controller.processEnterEvent(this.key.getText(),
this.value.getText());
} else if (source == this.recallButton) {
this.controller.processRecallEvent();
} else if (source == this.testButton) {
//Creates new JFrame window
JFrame test = new JFrame();
//Reads in store names
SimpleReader in = new SimpleReader1L("data/store.txt");
//Counts how many buttons to create
int passwordCount = 0;
while (!in.atEOS()) {
System.out.println(in.nextLine());
passwordCount++;
}
/*
* Previous operation went to the end of the file. We have to read
* in the file again.
*/
SimpleReader in2 = new SimpleReader1L("data/store.txt");
//Layout gets set.
test.setLayout(new FlowLayout());
//Creation of an array of JButtons
JButton[] storeButtons = new JButton[passwordCount];
for (int i = 0; i < passwordCount; i++) {
storeButtons[i] = new JButton(in2.nextLine());
storeButtons[i].addActionListener(this);
test.add(storeButtons[i]);
}
//Creates an array of Strings for the passwords
String[] passwordString = new String[passwordCount];
SimpleReader in3 = new SimpleReader1L("data/password.txt");
for (int i = 0; i < passwordCount; i++) {
passwordString[i] = in3.nextLine();
}
Object sourceFrame = event.getSource();
/*
* I'm just trying to get this to work with one of my buttons. I
* will use a for loop to cover all the buttons later.
*/
if (sourceFrame.equals(passwordString[0])) {
JOptionPane.showMessageDialog(test, "HEY");
}
test.pack();
test.setVisible(true);
in.close();
in2.close();
in3.close();
}
//Cursor normal again
this.setCursor(Cursor.getDefaultCursor());
}
}
答案 0 :(得分：1)
所有storeButtons都有ActionListener this。因此，无论何时点击它们都会运行actionPerformed()。但是，您需要if个语句来检查ActionEvent的来源是resetButton，enterButton，recallButton还是testButton。这意味着当来源是JButton的{{1}}之一时，它就不会做任何事情。
尝试向storeButtons添加匿名类，看看会发生什么。
storeButtons答案 1 :(得分：1)
为了便于阅读和维护，您应该将代码分成新类JFrame2： JFrame2是这样的：
public JFrame2 extends JFrame implements ActionListener{
String[] passwordString;
JButton[] storeButtons;
public JFrame2(){
//Reads in store names
SimpleReader in = new SimpleReader1L("data/store.txt");
//Counts how many buttons to create
int passwordCount = 0;
while (!in.atEOS()) {
System.out.println(in.nextLine());
passwordCount++;
}
/*
* Previous operation went to the end of the file. We have to read
* in the file again.
*/
SimpleReader in2 = new SimpleReader1L("data/store.txt");
//Layout gets set.
this.setLayout(new FlowLayout());
//Creation of an array of JButtons
storeButtons = new JButton[passwordCount];
for (int i = 0; i < passwordCount; i++) {
storeButtons[i] = new JButton(in2.nextLine());
storeButtons[i].addActionListener(this);
this.add(storeButtons[i]);
}
//Creates an array of Strings for the passwords
passwordString = new String[passwordCount];
SimpleReader in3 = new SimpleReader1L("data/password.txt");
for (int i = 0; i < passwordCount; i++) {
passwordString[i] = in3.nextLine();
}
this.pack();
this.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent event) {
JButton button = (JButton)event.getSource();//the button you are clicking
/*
* I'm just trying to get this to work with one of my buttons. I
* will use a for loop to cover all the buttons later.
*/
if (button.getText().equals(passwordString[0])) {
//JOptionPane.showMessageDialog(test, "HEY");
}
}
}