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当我把我的JPanel用BorderLayout的工作,它告诉我:constructer JPanel in class JPanel cannot be applied to given types; required: no arguments; found: BorderLayout; reason: actual and formal argument lists differ in length;
为什么我的BorderLayout不能与我的JPanel一起工作?
这里是我的代码:
public class MTGSAMPServerReference extends JFrame implements ActionListener {
public static Toolkit tk = Toolkit.getDefaultToolkit();
static int ScrnWidth = ((int) tk.getScreenSize().getWidth());
static int ScrnHeight = ((int) tk.getScreenSize().getHeight());
private static final long serialVersionUID = 1L;
private static JList list1;
private static JButton next;
public MTGSAMPServerReference() {
// set flow layout for the frame
this.getContentPane().setLayout(new FlowLayout(FlowLayout.LEADING));
Object[] data1 = { "Value 1", "Value 2", "Value 3", "Value 4", "Value 5" };
JPanel controls = new JPanel(new BorderLayout(5,5)); // The line getting the main error.
list1 = new JList<Object>(data1);
list1.setVisibleRowCount(5);
next = new JButton("Next");
next.addActionListener(this);
controls.add(new JScrollPane(list1)); // A result error of the JPanel error^
controls.add(next, BorderLayout.PAGE_END); // A result error of the JPanel error^
// adjust numbers as needed.
controls.setBorder(new EmptyBorder(25,25,0,0));
add(controls); // A result error of the JPanel error^
// add list to frame
add(list1);
add(next);
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Next")) {
int index = list1.getSelectedIndex();
System.out.println("Index Selected: " + index);
String s = (String) list1.getSelectedValue();
System.out.println("Value Selected: " + s);
}
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame f = new MTGSAMPServerReference();
//Display the window.
f.pack();
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(1200, 800);
f.setLocationRelativeTo(null);
list1.setSize(250, 250);
list1.setLocation(0, 0);
next.setSize(75, 25);
next.setLocation(251, 276);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
缺什么在我的代码? 我有我的所有进口,我相信这只是一个小错误,也许是一个错字。
任何和所有帮助表示赞赏!
在此先感谢!
编辑:这里是我有进口:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
为什么你忽略了'import'语句? –
@AndrewThompson人们总是告诉我只输入必要的代码。过去我被告知不包括进口产品。我应该包括他们吗? – knorberg
*“我应该吗?”*我会把“包装进口”放入SSCCE,就像我为我提供的例子一样。它仅向源代码添加了5行(在这种情况下),并且非常清楚哪些软件包包含这些类。顺便说一句,当我**做**添加在SSCCE中看到的进口 - 代码为我编译,没有任何警告或错误。 –