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我想从链表中删除特定的字符串,但我不断收到空指针异常错误!任何帮助家伙?不断收到链接列表中的空指针异常
public void delete(String deleteName) {
LinkedListNode current = head;
if(head==null){
System.out.println("Nothing to delete from the list! Insert data.");
}
// for head
else if(current.getName()==deleteName){
head=current.getNext();
}
// for tail
else if(findTail().getName() == deleteName){
while(current.getNext().getNext()!=null){
current = current.getNext();
}
current.setNext(null);
}
else{
while(current.getNext().getName()!=deleteName){
current=current.getNext();
}
current.setNext(current.getNext().getNext());
}
System.out.println("");
System.out.println(deleteName +" has been deleted from the list.");
}
充其量,你有两个问题 - 比较字符串与==(不,你不应该这样做),你真的应该提供你的NPE发生的地方。如果你在那条线上使用了一个调试器,它也将非常有用。 – Makoto 2014-10-18 01:57:52
注意current.getNext()。getNext()!= null会在current.getNext()为null时中断。 – 2014-10-18 02:01:26