java - AND Gate in Logical Circuit -

folks... i'll best explain method gets lot of members other classes logic should straightforward. so, in and gate of logical circuit, if input signal 0 output 0; if all of input signals 1 output 1; if have signals 0 , x(unknown signal), ouput 0; when 1 , x output should x. have bug in code of method because when, let's 0x signals fed in gate, i'm getting x instead of 0. smb please me? note:signal.hi 1, signal.lo 0, signal.x x. please let me know if more information needed.

public boolean propagate()      {         signal inputsignal;         signal outputfinalsignal;         signal temp = getoutput().getsignal();          list<wire> inputs = getinputs();          for(int = 0; < inputs.size(); i++)         {             inputsignal = inputs.get(i).getsignal();             if(inputsignal == signal.lo)             {                 getoutput().setsignal(signal.lo);                 break;             }              else if(inputsignal == signal.x)             {                 getoutput().setsignal(signal.x);                 break;             }              else              {                 getoutput().setsignal(inputsignal);             }          }         ........................//unnecessary problem code 

your logic should this:

signal result = signal.hi; // default value 1 for(int = 0; < inputs.size(); i++) {     inputsignal = inputs.get(i).getsignal();     if(inputsignal == signal.lo) {         // input 0 - final result 0 always, break         result = inputsignal;         break;     }     else if(inputsignal == signal.x) {         // input x, have 0 later, store x , continue without break         result = inputsignal;     }     else  {         // signal 1, skip meet 0 or x later or met x     } } getoutput().setsignal(result);