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我試圖用JOptionPane運行我的程序,它不輸出錯誤窗口。我的程序必須從文件中讀取乘客,他們都有名字,姓氏,航班等級,護照代碼和通關統計。如果乘客有黃色,橙色或紅色清除警告,應輸出JOptionPane對話框。消息框的標題應爲「安全清除警報」。JOptionPane的小問題
- 如果ClearanceException爲黃色,則顯示「繼續謹慎操作」。 - 如果ClearanceException爲橙色,則顯示「可能的威脅已識別。」。 - 如果ClearanceException爲紅色,顯示「威脅識別。聯繫執法」。
我的問題是黃色警告的對話框出現爲每個乘客和橙色和紅色的警告從來沒有出現。我的繼承人代碼
DRIVER/MAIN
package lab.assignment.pkg11;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.SecurityException;
import java.nio.file.Paths;
import java.util.Scanner;
import javax.swing.*;
import javax.swing.JOptionPane;
public class ClearanceException
{
private static Scanner input;
public static void main(String[] args)
{
String fName;
String lName;
String fClass;
String pCode;
String securityStatus;
code clCode = code.Yellow;
try
{
input = new Scanner(Paths.get("Passengers.dat"));
input.useDelimiter("[\r\n,]");
while (input.hasNext())
{
fName = input.next();
lName = input.next();
fClass = input.next();
pCode = input.next();
System.out.printf("%s, %s, %s,%s, %s%n", fName, lName, fClass, pCode, clCode);
switch (clCode)
{
case Yellow:
JOptionPane.showMessageDialog(null, "Proceed with caution.", "Code Yellow", JOptionPane.ERROR_MESSAGE);
break;
case Orange:
JOptionPane.showMessageDialog(null, "Possible threat identified.", "Code Orange", JOptionPane.ERROR_MESSAGE);
break;
case Red:
JOptionPane.showMessageDialog(null, "Threat identified. Contact law enforcement.", "Code Red", JOptionPane.ERROR_MESSAGE);
break;
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
enum code {Green, Yellow, Orange, Red;}
}
類
`package lab.assignment.pkg11;
public class ClearanceMain extends Exception
{
public ClearanceMain (String message)
{
super (message);
}
ClearanceMain()
{
throw new UnsupportedOperationException("Not supported yet.");
}
}`
記事本文件
`Bryan,Buonaiuto,econo,USA,Green
Emily,Cativo,busin,USA,Yellow
Edmond,Wint,first,USA,Orange
Eric,Monforte,busin,ITA,Red
James,Kilmeade,econo,USA,Green
Alexander,Antonacci,econo,PRT,Green
Gabriella,Johnson,first,CAN,Green
Barbara,Martinez,first,COL,Orange
Enam,Safi,econo,YEM,Orange
Sean,Yakub,busin,YEM,Orange
Christina,Tarin,busin,CMR,Green
Emily,Sharma,econo,CMR,Green
Charnelle,Kupfer,econo,DEU,Green
Aaron,Gossett,econo,DEU,Green
Conrad,Golder,econo,USA,Green
Carla,Vasquez,first,USA,Green
Melinda,Osorio,first,DOM,Green
Antonio,Espinoza,econo,DOM,Green
Seth,Howell,busin,USA,Orange
Navpreet,Afzal,busin,PAK,Red
Thomas,Przywara,busin,BEL,Green
Lea,Gaang,econo,BEL,Green
Phoebe,Starks,first,USA,Green
Netel,Abdelghani-Serour,econo,PAK,Green
Ayush,Juzumas,econo,AGO,Green
Ayesha,Saagber,first,AGO,Green
Darla,Zagorski,busin,DEU,Green
Ling,Weng,first,CHIN,Yellow
Chin,Weng,first,CHIN,Yellow
Adbdul,Islam,econo,PAK,Red
Gissele,Bencosme,econo,USA,Green
Ismanel,Kefalas,busin,IND,Green
Lee,Kang,busin,KOR,Green
Graciela,Quinones,econo,SLV,Green
Jorges,Quinones,econo,SLV,Green
Lissette,Quinones,econo,SLV,Green
Nutan,Patel,first,IND,Green
Wilson,Singh,first,IND,Green`
在最窄的範圍內聲明變量是個好習慣 - 在你的情況下,在循環內而不是外部。你根本不需要默認值'黃色'。 – MirMasej