I'm using the Eclipse IDE, and I'm trying to call showSaveDialog(null) from another method which is in turn called from main, but nothing happens when I call it.
Main:
public static void main(String[] args) {
Main main = new Main();
main.pt = main.new PlayThread();
main.generateSound(getSamples(2), 500);
main.play(main.sound, 1);
if(new Scanner(System.in).nextLine().equals("save")){
System.out.println(main.save());
}
}
All the code before calling main.save() works fine, and main.save() starts like this:
public boolean save(){
System.out.println("Calling save");
try{
String saveName = getSaveTo("C:/");
System.out.println("I'm here now");
while getSaveTo() looks like:
public String getSaveTo(String def){
JFileChooser chooser = new JFileChooser();
System.out.println("Save called");
//chooser.setCurrentDirectory(new File(def));
int resp = chooser.showSaveDialog(null);
if(resp == JFileChooser.APPROVE_OPTION){
return chooser.getSelectedFile() + ".wav";
}else return null;
}
After it executes the first few functions in main, I type in 'save', and the console prints:
Calling save
Save called
But the dialog never opens, and it never says "I'm here now." Why's that? Also, when I typed
new JFileChooser().showSaveDialog(null)
That shows up fine, but in my save() method, it won't. Any ideas why?
EDIT:
Here's a condensed program which has the same problem:
package com.funguscow;
import java.util.Scanner;
import javax.swing.JFileChooser;
import com.funguscow.Main.PlayThread;
public class Test {
public static void main(String[] args) {
Test main = new Test();
Scanner scan = new Scanner(System.in);
boolean should = scan.nextLine().equals("save");
scan.close();
if(should){
System.out.println(main.save());
}
}
public String getSaveTo(String def){
JFileChooser chooser = new JFileChooser();
System.out.println("Save called");
//chooser.setCurrentDirectory(new File(def));
int resp = chooser.showSaveDialog(null);
System.out.println("Save called");
if(resp == JFileChooser.APPROVE_OPTION){
return chooser.getSelectedFile() + ".wav";
}else return null;
}
public boolean save(){
System.out.println("Calling save");
try{
String saveName = getSaveTo("C:/");
System.out.println("I'm here now");
if(saveName == null)return false;
}catch(Exception e){}
return false;
}
}
You can run this yourself if you'd like to examine it more.
This MCVE may be enough to reproduce the problem, and it seems that the Scanner that is initialized with System.in is interfering with the JFileChooser's ability to display an open file dialog, even when care is taken so that the file chooser is run on the Swing event thread:
import java.util.Scanner;
import javax.swing.JFileChooser;
import javax.swing.SwingUtilities;
public class Test3 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.print("Enter something and press Enter: ");
scan.nextLine();
scan.close();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFileChooser fileChooser = new JFileChooser();
int result = fileChooser.showOpenDialog(null);
}
});
// JFileChooser fileChooser = new JFileChooser();
// int result = fileChooser.showOpenDialog(null);
}
}
chooser.showSaveDialog(null);– PushkinThread? – PushkinScannerand changing the confirmation to something using aJOptionPaneinstead. Guess I got really lucky, too, as it actually saves a playable audio file like I intended it to. – PushkinSystem.in, then closed, then a JFileChooser is created and displayed, but the latter is set up to run on the Swing Event Dispatch Thread. – Selima}catch(Exception e){}Never swallow exceptions. What happens when you adde.printStackTrace();inside your catch block? – Selfsatisfaction