Java SWT文件对话框打开问题
我需要打开一个文件对话框,在Windows7 Home上使用Java7使用SWT打开一个文件。我需要在按下BrowseBtn1按钮(SWT)时打开此文件对话框。我正在为此使用addSelectionListener。这是正确的方法吗?如果是,为什么我的对话框在没有遇到任何运行时错误时无法打开。我根本不使用AWT,只使用SWTJava SWT文件对话框打开问题,java,swt,filedialog,Java,Swt,Filedialog,我需要打开一个文件对话框,在Windows7 Home上使用Java7使用SWT打开一个文件。我需要在按下BrowseBtn1按钮(SWT)时打开此文件对话框。我正在为此使用addSelectionListener。这是正确的方法吗?如果是,为什么我的对话框在没有遇到任何运行时错误时无法打开。我根本不使用AWT,只使用SWT import org.eclipse.swt.*; import org.eclipse.swt.widgets.*; import org.eclipse.swt.wid
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.layout.*;
public class MySwtApp {
public static Display display;
public static Shell shell;
public static void main(String[] args) {
display = new Display ();
shell = new Shell (display);
shell.setText("MY TITLE");
GridLayout gridLayout = new GridLayout (3, false);
shell.setLayout (gridLayout);
Label Label1 = new Label (shell, SWT.NONE);
Label1.setText ("Select Message ");
GridData data = new GridData (200, SWT.DEFAULT);
Label1.setLayoutData (data);
Combo Combo1 = new Combo (shell, SWT.NONE);
Combo1.setItems (new String [] {"Option A",
"Option B"});
// CaseStudyCombo.setText ("CaseStudyCombo");
data = new GridData (200, SWT.DEFAULT);
Combo1.setLayoutData (data);
Combo1.addListener (SWT.DefaultSelection, new Listener () {
public void handleEvent (Event e) {
System.out.println (e.widget + " - Default Selection");
}
});
Label emptyLabel = new Label (shell, SWT.NONE);
emptyLabel.setText ("");
data = new GridData (50, SWT.DEFAULT);
emptyLabel.setLayoutData (data);
Label Label2 = new Label (shell, SWT.NONE);
Label2.setText ("Next Message: ");
data = new GridData (200, SWT.DEFAULT);
Label2.setLayoutData (data);
final Text text4 = new Text (shell, SWT.BORDER);
text4.setText ("");
data = new GridData (215, SWT.DEFAULT);
text4.setLayoutData (data);
Button BrowseBtn1 = new Button (shell, SWT.PUSH);
BrowseBtn1.setText ("Browse");
data = new GridData (80, SWT.DEFAULT);
BrowseBtn1.setLayoutData (data);
BrowseBtn1.addSelectionListener(new SelectionAdapter() {
String result = "";
public void WidgetSelected(SelectionEvent e) {
FileDialog dialog = new FileDialog (shell, SWT.OPEN);
dialog.setFilterExtensions(new String [] {"*.html"});
//dialog.setFilterPath("c:\\temp");
result = dialog.open();
text4.setText(result);
}
});
Label Label3 = new Label (shell, SWT.NONE);
Label3.setText ("Message Label 3: ");
data = new GridData (200, SWT.DEFAULT);
Label3.setLayoutData (data);
Text text5 = new Text (shell, SWT.BORDER);
text5.setText ("");
data = new GridData (215, SWT.DEFAULT);
text5.setLayoutData (data);
Button BrowseBtn2 = new Button (shell, SWT.PUSH);
BrowseBtn2.setText ("Browse");
data = new GridData (80, SWT.DEFAULT);
BrowseBtn2.setLayoutData (data);
Label Label4 = new Label (shell, SWT.NONE);
Label4.setText ("Message Label 4: ");
data = new GridData (200, SWT.DEFAULT);
Label4.setLayoutData (data);
Combo Combo2 = new Combo (shell, SWT.NONE);
Combo2.setText ("Options");
data = new GridData (200, SWT.DEFAULT);
Combo2.setLayoutData (data);
Button searchBtn1 = new Button (shell, SWT.PUSH);
searchBtn1.setText ("Search");
data = new GridData (80, SWT.DEFAULT);
searchBtn1.setLayoutData (data);
Combo Combo3 = new Combo (shell, SWT.NONE);
// CaseStudyCombo.setItems (new String [] {"Item 1", "Item 2", "Item 2"});
Combo3.setText ("Options:");
data = new GridData (200, SWT.DEFAULT);
Combo3.setLayoutData (data);
Combo Combo4 = new Combo (shell, SWT.NONE);
Combo4.setText ("Options:");
data = new GridData (200, SWT.DEFAULT);
Combo4.setLayoutData (data);
Button showDetailsBtn = new Button (shell, SWT.PUSH);
showDetailsBtn.setText ("Show Details");
data = new GridData (80, SWT.DEFAULT);
showDetailsBtn.setLayoutData (data);
shell.pack ();
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ())
display.sleep ();
}
display.dispose ();
}
}
请帮助解决此问题。有问题的行是:
public void WidgetSelected(SelectionEvent e)
注意大写字母“W”。您当前正在该匿名类中定义一个新方法(而不是重写现有的widgetSelected(…)方法)。如果您像这样将其更改为小写字母“w”,它将工作:
public void widgetSelected(SelectionEvent e)
使用@Override注释是一个很好的实践(实际上比推荐的要多)。如果您使用了该注释,编译器会将您标记为错误(例如,请参阅Joshua Bloch Effective Java第二版第36项:始终使用覆盖注释)问题在于:
public void WidgetSelected(SelectionEvent e)
注意大写字母“W”。您当前正在该匿名类中定义一个新方法(而不是重写现有的widgetSelected(…)方法)。如果您像这样将其更改为小写字母“w”,它将工作:
public void widgetSelected(SelectionEvent e)
使用@Override注释是一个很好的实践(实际上比推荐的要多)。如果您使用了该注释,编译器会将您标记为错误(请参阅Joshua Bloch Effective Java第二版第36项:始终使用覆盖注释)提示:请坚持。提示:请坚持。