我在我的java類中有以下代碼。如何處理空指針異常?
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package webservice;
import java.util.Iterator;
import java.util.List;
public class Webservice {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
ArrayOfString aar = new ArrayOfString();
aar.getString().add("1025976002");
aar.getString().add("1026020904");
aar.getString().add("1026020704");
aar.getString().add("1026026201");
aar.getString().add("1026036901");
aar.getString().add("");
ArrayOfStatusContainer status = getStatusList(aar);
List<StatusContainer> li = status.getStatusContainer();
Iterator litr=li.listIterator();
// System.out.println("Elements in forward directiton");
while(litr.hasNext()){
StatusContainer test = (StatusContainer)litr.next();
System.out.println(test.getStatus());
}
}
private static ArrayOfStatusContainer getStatusList(webservice.ArrayOfString keys) {
webservice.AdStatusWS service = new webservice.AdStatusWS();
webservice.AdStatusWSSoap port = service.getAdStatusWSSoap();
return port.getStatusList(keys);
}
}
當我輸入一個空字符串或輸入重複的字符串值時,我得到一個空指針異常。我一直在嘗試,但到目前爲止我還沒有找到解決辦法。我附上了下面例外的屏幕截圖。堆棧跟蹤如下:
Sent
Booked
Multiple Errors
Exception in thread "main" java.lang.NullPointerException
In QC
Need correction client
at webservice.Webservice.main(Webservice.java:34)
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)
使用調試器,遍歷你的代碼,確定'null'引用來自哪裏,如果它是無效的,則更正它。 –
堆棧跟蹤請?圖像不清楚。 –
這是什麼,爲螞蟻調試? – nhgrif