所以我继续我的斗争:创建Java对话框任务。现在我的 JOptionPane 会打开信封溢出的新窗口,但我无法更改此窗口的大小。另外我想在左上角有发送者的数据,在右下角有接收者的数据。我怎样才能做到这一点?OptionPane 本身也存在问题。单击“确定”后,它会在屏幕左上角打开小窗口。这是什么,为什么会出现?
我的代码:
import java.awt.*;
import java.awt.Font;
import javax.swing.*;
public class Main extends JFrame {
private static JTextField nameField = new JTextField(20);
private static JTextField surnameField = new JTextField();
private static JTextField addr1Field = new JTextField();
private static JTextField addr2Field = new JTextField();
private static JComboBox sizes = new JComboBox(new String[] { "small", "medium", "large", "extra-large" });
public Main(){
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
getContentPane().add(mainPanel);
JPanel addrPanel = new JPanel(new GridLayout(0, 1));
addrPanel.setBorder(BorderFactory.createTitledBorder("Receiver"));
addrPanel.add(new JLabel("Name"));
addrPanel.add(nameField);
addrPanel.add(new JLabel("Surname"));
addrPanel.add(surnameField);
addrPanel.add(new JLabel("Address 1"));
addrPanel.add(addr1Field);
addrPanel.add(new JLabel("Address 2"));
addrPanel.add(addr2Field);
mainPanel.add(addrPanel);
mainPanel.add(new JLabel(" "));
mainPanel.add(sizes);
String[] buttons = { "OK", "Cancel"};
int c = JOptionPane.showOptionDialog(
null,
mainPanel,
"My Panel",
JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE,
null,
buttons,
buttons[0]
);
if(c ==0){
new Envelope(nameField.getText(), surnameField.getText(), addr1Field.getText()
, addr2Field.getText(), sizes.getSelectedIndex());
}
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String[] args) {
new Main();
}
}
class Envelope extends JFrame {
private final int SMALL=0;
private final int MEDIUM=1;
private final int LARGE=2;
private final int XLARGE=3;
public Envelope(String n, String s, String a1, String a2, int i){
Container content = getContentPane();
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
mainPanel.add(new JLabel("John Doe"));
mainPanel.add(new JLabel("FooBar str 14"));
mainPanel.add(new JLabel("Newark, 45-99"));
JPanel dataPanel = new JPanel();
dataPanel.setFont(new Font("sansserif", Font.PLAIN, 32)); //set size from i
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
mainPanel.setBackground(Color.ORANGE);
mainPanel.add(new JLabel("Mr "+n+" "+s));
mainPanel.add(new JLabel(a1));
mainPanel.add(new JLabel(a2));
content.setSize(450, 600);
content.setBackground(Color.ORANGE);
content.add(mainPanel, BorderLayout.NORTH);
content.add(dataPanel, BorderLayout.SOUTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
}