我有以下方法从文本中获取输入,然后它应该逐行存储:
public static MDVRPData parse(String myFile) {
MDVRPData myData = new MDVRPData(0, 0, 0, null, null);
try {
Scanner s = new Scanner(new FileReader(myFile));
int currentLine = 1;
String line = s.nextLine();
String delims = "[ ]+";
String[] tokens = line.split(delims);
if (Integer.parseInt(tokens[0]) != 2) {
System.out.println("The data might not be appropriate.");
}
myData.setNrVehicle(Integer.parseInt(tokens[1]));
myData.setNrCustomers(Integer.parseInt(tokens[2]));
myData.setNrDepots(Integer.parseInt(tokens[3]));
DepotData[] dData = new DepotData[myData.getNrDepots()];
CustomerData[] cData = new CustomerData[myData.getNrCustomers()];
while (s.hasNextLine()) {
line = s.nextLine();
delims = "[ ]+";
tokens = line.split(delims);
currentLine++;
for (int i = 0; i < tokens.length; i++) {
System.out.print(tokens[i] + ' ');
}
System.out.println(currentLine);
if (currentLine <= myData.getNrDepots() + 1) {
dData[currentLine - 2].setMaxDuration(Integer.parseInt(tokens[0]));
dData[currentLine - 2].setMaxLoad(Integer.parseInt(tokens[1]));
}
if ((currentLine > myData.getNrDepots() + 1) && (currentLine <= 1 + myData.getNrDepots() + myData.getNrCustomers())) {
cData[currentLine - 1 - myData.getNrDepots()].setNumber(Integer.parseInt(tokens[0]));
cData[currentLine - 1 - myData.getNrDepots()].setxCoord(Integer.parseInt(tokens[1]));
cData[currentLine - 1 - myData.getNrDepots()].setyCoord(Integer.parseInt(tokens[2]));
cData[currentLine - 1 - myData.getNrDepots()].setServiceDuration(Integer.parseInt(tokens[3]));
cData[currentLine - 1 - myData.getNrDepots()].setDemand(Integer.parseInt(tokens[4]));
cData[currentLine - 1 - myData.getNrDepots()].setFrequencyOfVisit(Integer.parseInt(tokens[5]));
cData[currentLine - 1 - myData.getNrDepots()].setVisitCombNr(Integer.parseInt(tokens[6]));
int j;
int[] temp = new int[Integer.parseInt(tokens[6])];
for (j = 0; j < temp.length; j++) {
temp[j] = Integer.parseInt(tokens[7 + j]);
}
cData[currentLine - 1 - myData.getNrDepots()].setVisitCombList(temp);
}
if (currentLine > myData.getNrCustomers() + myData.getNrDepots() + 1) {
dData[currentLine - myData.getNrCustomers() + myData.getNrDepots() + 2].setNumber(Integer.parseInt(tokens[0]));
dData[currentLine - myData.getNrCustomers() + myData.getNrDepots() + 2].setxCoord(Integer.parseInt(tokens[1]));
dData[currentLine - myData.getNrCustomers() + myData.getNrDepots() + 2].setyCoord(Integer.parseInt(tokens[2]));
}
}
myData.setCustomerData(cData);
myData.setDepotData(dData);
} catch (IOException ex) {
ex.printStackTrace(); // for now, simply output it.
} finally {
return myData;
}
}
这是输入文本的一部分:
2 2 50 4
0 160
0 160
0 160
0 160
1 37 52 0 7 1 4 1 2 4 8
2 49 49 0 30 1 4 1 2 4 8
3 52 64 0 16 1 4 1 2 4 8
4 20 26 0 9 1 4 1 2 4 8
5 40 30 0 21 1 4 1 2 4 8
6 21 47 0 15 1 4 1 2 4 8
由于某种原因,代码读取第一行正确,进入while循环,读取第二行正确并停止。在实现这个方法之前,我写了一个只是逐行获取文件,然后将其拆分为String line = s.nextLine(); String delims ="[ ]+"; String[] tokens = line.split(delims)
并打印它并且它没有问题。
答案 0 :(得分:1)
您的代码是否可能抛出非IOException?如果是,那么您的应用程序将默默地吞下错误并返回到目前为止读取的行。
例如,在下面设计的代码片段中,即使抛出RuntimeException,也只会忽略它:
try {
int i = 0;
if (i == 1) {
throw new IOException("wont be thrown");
}
throw new RuntimeException("boom");
} catch(IOException e) {
System.out.println("Got an exception");
} finally {
return "a result";
}
将返回“结果”,并且调用代码将不是更明智的。
要检查,我建议添加一个“catch all”块来验证:
...
} catch(IOException e) {
System.out.println("Got an exception");
} catch(Throwable te) {
System.out.println("Got another exception");
} finally {
...
答案 1 :(得分:1)
我在Sean Landsman的帮助下找到了我的错误。我在IOException之后添加了一个catch:
} catch (Throwable e) {
System.out.println("Got another exception");
final StringWriter sw = new StringWriter();
final PrintWriter pw = new PrintWriter(sw, true);
e.printStackTrace(pw);
System.out.println(sw.getBuffer().toString());
}
我得到了NullPointerException,因为在创建数组后我没有初始化我的对象。我通过添加以下代码来消除错误:
DepotData[] dData = new DepotData[myData.getNrDepots()];
for (int i = 0; i < myData.getNrDepots(); i++) {
dData[i] = new DepotData(0, 0, 0, 0, 0);
}
CustomerData[] cData = new CustomerData[myData.getNrCustomers()];
for (int i = 0; i < myData.getNrCustomers(); i++) {
cData[i]= new CustomerData(0, 0,0,0,0,0,0,null);
}