[英]Why doesn't my Java exception print a stack trace when thrown inside a SwingWorker?
Why is it that when I wrap a SwingWorker around this code it no longer reports an exception being thrown? 为什么当我围绕此代码包装SwingWorker时,它不再报告抛出异常?
import java.security.InvalidParameterException;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
public class Test {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new SwingWorker<Void, Void>() {
@Override
protected Void doInBackground() throws Exception {
IntegerString s = new IntegerString("EIGHT");
return null;
}
}.execute();
}
});
}
}
class IntegerString {
public IntegerString(String s) {
if (!isInteger(s)) {
System.out.println("...throwing exception.");
throw new InvalidParameterException("Thrown.");
}
// ...
}
static boolean isInteger(String str) {
if (str == null) {
return false;
}
int length = str.length();
if (length == 0) {
return false;
}
int i = 0;
if (str.charAt(0) == '-') {
if (length == 1) {
return false;
}
i = 1;
}
for (; i < length; i++) {
char c = str.charAt(i);
if (c <= '/' || c >= ':') {
return false;
}
}
return true;
}
}
You have to call get()
to retrieve any exceptions that occurred in doInBackground()
. 您必须调用
get()
来检索doInBackground()
中发生的任何异常。 For example, you can do it in done()
method, ie: 例如,您可以在
done()
方法中执行此done()
,即:
@Override
protected void done() {
try {
get();
} catch (Exception e) {
e.printStackTrace();
}
}
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