question: public EvalStateNodeNumber newChildNum ( int newStateNumber ) { int [ ] num = new int [ stateNumber . length + 1 ] ; System . arraycopy ( stateNumber , 0 , num , 0 , stateNumber . length ) ; num [ stateNumber . length ] = newStateNumber ; return new EvalStateNodeNumber ( num ) ; }
target:  Generates a new child node number to the current node number with the given child id.