()),
Integer.parseInt(cols.getText()));
d.show();
}
}
public static void main(String[] args) {
Frame f = new ToeTestNew();
f.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setSize(200,100);
f.setVisible(true);
}
} ///:~
由于“静态”的东西只能位于类的外部一级，所以内部类不可能拥有静态数据或者静态内部类。8. 文件对话框这个例子是直接用新事件模型对FileDialogTest.java修改而来。
//: FileDialogNew.java
// Demonstration of File dialog boxes
import java.awt.*;
import java.awt.event.*;
public class FileDialogNew extends Frame {
TextField filename = new TextField();
TextField directory = new TextField();
Button open = new Button("Open");
Button save = new Button("Save");
public FileDialogNew() {
setTitle("File Dialog Test");
Panel p = new Panel();
p.setLayout(new FlowLayout());
open.addActionListener(new OpenL());
p.add(open);
save.addActionListener(new SaveL());
p.add(save);
add(p, BorderLayout.SOUTH);
directory.setEditable(false);
filename.setEditable(false);
p = new Panel();
p.setLayout(new GridLayout(2,1));
p.add(filename);
p.add(directory);
add(p, BorderLayout.NORTH);
}
class OpenL implements ActionListener {
public void actionPerformed(ActionEvent e) {
// Two arguments, defaults to open file:
FileDialog d = new FileDialog(
FileDialogNew.this,
"What file do you want to open?");
d.setFile("*.java");
d.setDirectory("."); // Current directory
d.show();
String yourFile = "*.*";
if((yourFile = d.getFile()) != null) {
filename.setText(yourFile);
directory.setText(d.getDirectory());
} else {
filename.setText("You pressed cancel");
directory.setText("");
}
}
}
class SaveL implements ActionListener {
public void actionPerformed(ActionEvent e) {
FileDialog d = new FileDialog(
FileDialogNew.this,
"What file do you want to save?",
FileDialog.SAVE);
d.setFile("*.java");
d.setDirectory(".");
d.show();
String saveFile;
if((saveFile = d.getFile()) != null) {
filename.setText(saveFile);
directory.setText(d.getDirectory());
} else {
filename.setText("You pressed cancel");
directory.setText("");
}
}
}
public static void main(String[] args) {
Frame f = new FileDialogNew();
f.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setSize(250,110);
f.setVisible(true);
}
} ///:~
如果所有的改变是这样的容易那将有多棒，但至少它们已足够容易，并且我们的代码已受益于这改进的可读性上。 |
