我有一个变量_b。我正在累加，但是对于k的for循环的每次迭代，变量将重置为0。相同的代码可以作为本地Java应用程序正常工作。有谁知道为什么会这样？以下是我的程序代码片段：
public void map(Object key, Text value, Context context)
{
int m, b, _m, _b;
for (int i = 1; i <= N; ++i)
{
for (int j = i; j <= N; ++j)
{
_m = 0;
_b = 0;
for (int k = i; k <= j; ++k)
{
int _bTemp=0;
context.write(new Text(Integer.toString(i)+","+Integer.toString(j)),new Text("Reset_bTemp=" + _bTemp + " ShouldNotReset_b=" + _b ));
/* Calculating smallM, _m and assigning it to global variable m */
_m += calculateSmallM(k,queryWord,value);
//context.write(new Text(Integer.toString(i)+","+Integer.toString(j)),new Text("_m=" + _m));
/* Calculating smallB, _b and assigning it to global variable b */
_bTemp = calculateSmallB(k,value);
_b += _bTemp;
context.write(new Text(Integer.toString(i)+","+Integer.toString(j)),new Text("_bTemp=" + _bTemp + "_b=" + _b ));
}// end of for k
/* Assigning _m and _b to m and b */
m = _m;
b = _b;
/* Calculating Discrepancy Score */
discrepancyScore = calculateDiscrepancyScore(m,b,M,B);
if (discrepancyScore > dmax)
{
dmax = discrepancyScore;
iMax = i;
jMax = j;
}
}// end of for j
hotspot_interval = Double.toString(dmax) + "=(" + Integer.toString(iMax) + "," + Integer.toString(jMax) + ")-(" + Integer.toString(i) + "," + Integer.toString(j) + ")";
hotspot.set(hotspot_interval);
}// end of for i
}
public int calculateSmallB(int k, Text value, Context context) throws IOException, InterruptedException
{
int colon;
String line = null;
String tpifreqList = null;
String lineWord = null;
StringTokenizer st = new StringTokenizer(value.toString(),"\n");
line = st.nextToken();
//while (st.hasMoreTokens())
//while((line = st.nextToken()) != null)
while(line != null)
{
//line = st.nextToken();
colon = line.indexOf("::");
lineWord = line.substring(0, colon);
tpifreqList = line.substring(lineWord.length() + 2);
/* lineWord.length()+1 will give the string starting with ":" */
context.write(new Text(lineWord), new Text("Value of _b just after while(" + k + ")=" + smallB));
/* trimming to remove whitespaces */
tpifreqList = tpifreqList.trim();
String[] tpiFreq = tpifreqList.split(","); /* Splitting to get a array of tpindex-freq values */
/* Iterating through the array to retrieve and sum up all the frequencies for the 'word' occurring at tpindex k */
for (int n = 0; n < tpiFreq.length; n++)
{
tpiFreq[n] = tpiFreq[n].trim();
/* Checking if the tpindex is equal to k */
if (tpiFreq[n].indexOf(Integer.toString(k)) == 0)
{
/* If yes, retrieve the frequency */
int hypen = tpiFreq[n].indexOf("-");
int freq = Integer.parseInt(tpiFreq[n].substring(hypen + 1));
//_b += freq;
smallB += freq;
context.write(new Text(lineWord), new Text("calculateSmallB(" + k + ")=" + smallB));
}
}
context.write(new Text(lineWord), new Text("_b just after for(" + k + ")=" + smallB));
line = st.nextToken();
}
return smallB;
}