java - Iterator and If -


i got little problem programm.

iterator<mystring> = globalset.iterator(); iterator<string> it2 = globalarray.iterator();            while(it.hasnext() && it2.hasnext())         {             system.out.println(it2.next());             if(it.next().getline().contains(it2.next()) == true)             {                   //it.remove();             }          }

if disable if clause output correct , looks this:

1;trägertour 096;1410;autotour 1n410; 2;trägertour 097;1410;autotour 1n410; 3;trägertour 098;1410;autotour 1n410; 4;trägertour 099;1410;autotour 1n410; 5;trägertour 100;1410;autotour 1n410;

but if if clause enabled output looks this: 

1;trägertour 096;1410;autotour 1n410; 3;trägertour 098;1410;autotour 1n410; 5;trägertour 100;1410;autotour 1n410;

so why?

you advance same iterator twice in same iteration of while loop (by calling it2.next() twice). shouldn't.

    while(it.hasnext() && it2.hasnext()) {         string str = it2.next();         system.out.println(str);         if(it.next().getline().contains(str)) {             //it.remove();         }     }

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