[英]trouble with StringTokenizer
I'm getting the following error message and I can't seem to figure out the problem. 我收到以下错误消息,但似乎无法找出问题所在。 Would really appreciate any help. 非常感谢您的帮助。 The error message reads as:- 错误消息显示为:-
BaseStaInstance.java:68: cannot find symbol BaseStaInstance.java:68:找不到符号
symbol : constructor StringTokenizer(java.lang.Object,java.lang.String) symbol:构造函数StringTokenizer(java.lang.Object,java.lang.String)
location: class java.util.StringTokenizer st = new StringTokenizer(buf,","); 位置:类java.util.StringTokenizer st = new StringTokenizer(buf,“,”);
^
Here, BaseStaInstance is my main public class. 在这里,BaseStaInstance是我的主要公共类。
The class that implements this StringTokenizer is as follows:- 实现此StringTokenizer的类如下:-
class ServerConnect extends Thread { ServerConnect类扩展线程{
Socket skt;
int iProcessId, iInProcessId;
int iOwnTimeStamp, iInTimeStamp;
ServerConnect scnt = null;
ObjectOutputStream myOutput;
ObjectInputStream myInput;
ServerConnect(){}
ServerConnect(Socket connection, int iProcessNo) {
this.skt = connection;
this.iProcessId = iProcessNo;
}
public void run() {
try {
//initialize the object "scnt" using the parameterized constructor
ServerConnect scnt = new ServerConnect(skt, iProcessId);
myInput = new ObjectInputStream(skt.getInputStream());
while(true) {
try{
iOwnTimeStamp = Global.iTimeStamp;
Object buf = myInput.readObject();
//if we got input, print it out and write a message back to the remote client...
if(buf != null){
scnt.replyChoice(buf);
}
}catch(ClassNotFoundException e) {
e.printStackTrace();
}
}
} catch(IOException e) {
e.printStackTrace();
}
}
void replyChoice(Object buf){
try{
String sDeferReply = "";
myOutput = new ObjectOutputStream(skt.getOutputStream());
//the place where the basestation reads the request from the other basestation
System.out.println("Server read:[ "+buf+" ]");
//extract out the process id and the timestamp from the incoming request
buf = buf.toString();
***StringTokenizer st = new StringTokenizer(buf,",");***
//skip the word request
st.nextToken();
iInProcessId = Integer.parseInt(st.nextToken());
iInTimeStamp = Integer.parseInt(st.nextToken());
//check request is made
//there is a possibility of entering the else loop only on the very first iteration
//the control flows into the if loop even if one request has been made
if(iOwnTimeStamp != 0){
//if the incoming request has a larger timestamp (logical clock value, process id) than the current process, we defer the reply
if(iOwnTimeStamp < iInTimeStamp || iProcessId < iInProcessId){
sDeferReply="iInTimeStamp"+","+"iInProcessId";
Global.v.addElement(new String(sDeferReply));
}
//incoming request has a smaller timestamp than the basestation request itself
else{
myOutput.writeObject("Reply");
myOutput.flush();
}
}
//if the current process is in the critical section then we defer replies
else if(Global.iCriticalSection==1){
sDeferReply="iInTimeStamp"+","+"iInProcessId";
Global.v.addElement(new String(sDeferReply));
}
//start of execution of the thread, there is a possibility that the basestation hasn't issued a request
else{
myOutput.writeObject("Reply");
myOutput.flush();
}
}catch(IOException e){
e.printStackTrace();
}
}
} }
The part that implements the StringTokenizer function has *** surrounding it. 实现StringTokenizer函数的部分带有***。
Thanks in advance to anyone who might be able to help me out. 在此先感谢任何可能帮助我的人。
Try 尝试
StringTokenizer st = new StringTokenizer((String) buf,",");
The reason why you're getting that error is because buf
, while referring to a String
at that point, is still of type Object
. 之所以会出现该错误,是因为buf
在此时引用一个String
时,其类型仍然是Object
。
As an additional tip, you really should make the effort to try to understand the error message given by the compiler. 另外,您确实应该努力尝试理解编译器给出的错误消息。 Look at the following: 请看以下内容:
cannot find symbol constructor StringTokenizer(java.lang.Object,java.lang.String)
location: class java.util.StringTokenizer st = new StringTokenizer(buf,",");
Compiler error messages don't always make sense, but this is as good as it gets . 编译器错误消息并不总是很有意义,但这已经足够了 。 It tells you that: 它告诉您:
java.util.StringTokenizer
, so it's not an import
or name obscuring problem, etc. 它找到了正确的类型java.util.StringTokenizer
,因此它不是import
或名称混淆的问题,等等。 StringTokenizer
does NOT have a constructor that takes a (java.lang.Object, java.lang.String)
. 确实,对API的快速检查确认StringTokenizer
没有采用(java.lang.Object, java.lang.String)
的构造函数。 java.lang.Object
, and the type of your second argument is a java.lang.String
!!! 确实 ,第一个参数的类型是java.lang.Object
,第二个参数的类型是java.lang.String
! That was how I was able to quickly pinpoint the problem in the source code and suggest a quick fix. 这就是我能够快速查明源代码中的问题并提出快速修复的方法。
Being able to process error messages given by the compiler is an essential skill that you must develop, so I hope this proves to be an educational experience for you. 能够处理编译器给出的错误消息是您必须开发的一项基本技能 ,因此,我希望这对您来说是一种教育经验。
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