java - swing - 如何使用按钮切换 JPanel

Question

大家好，我计划创建登录面板。该面板中应包含用户 JLabel、密码 JLabel、用户 JTextField、密码 JTextField 和 JButon。我想使用该按钮切换到新的 JPanel。我读过最好的方法是 CardLayout，我正在尝试修改该代码:

//Where the GUI is assembled:
//Put the JComboBox in a JPanel to get a nicer look.
JPanel comboBoxPane = new JPanel(); //use FlowLayout
String comboBoxItems[] = { BUTTONPANEL, TEXTPANEL };
JComboBox cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
...
pane.add(comboBoxPane, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);
...

//Method came from the ItemListener class implementation,
//contains functionality to process the combo box item selecting
public void itemStateChanged(ItemEvent evt) {
    CardLayout cl = (CardLayout)(cards.getLayout());
    cl.show(cards, (String)evt.getItem());
}

我正在尝试修改那部分代码

JComboBox cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
pane.add(comboBoxPane, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);

并将其更改为:

JButton loginButton = new JButton();
loginButton.addItemListener(this);
comboBoxPane.add(loginButton);
pane.add(loginButton, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);

我无法使用:

JButton loginButton = new JButton(comboBoxItems);

因为编译器返回错误:构造函数 JButton(String[]) 未定义

有谁可以帮我解决我的问题吗？我是 Java 编程新手

Answer 1

JButton 没有采用 String 数组的构造函数。调用就足够了:

JButton loginButton = new JButton("Login");

参见:Creating a GUI With JFC/Swing