java - Crossover function of two vector error -


the goal of function use 1 point crossover function between 2 vector new hybrid "son" vector having element first vector , second 1 .

public vector crossover(int sol1,int sol2){     int size;   vector sol1 = new vector();   vector sol2 = new vector();   sol1 = (vector) allpop.get(sol1);   sol2 = (vector) allpop.get(sol2);   int crosspoint = (int) sol1.size()/2 ;   vector son =  new vector();       son= (vector) sol1.clone() ;       if (sol1.size() < sol2.size())             size = sol1.size();       else size = sol2.size();    for(int j=(crosspoint-1);j<size;j++)     son.set(j,sol2.get(j));          return son;                                           }

sometimes works , gives me "java.lang.arrayindexoutofboundsexception " error .. ideas ?

attach debugger, see on values fails. i'd wager crosspoint equal 0 when sol1.size() 1 or less, index j equal -1, throw exception.


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