public void dfs() // depth-first search
{ // begin at vertex 0
vertexList[0].wasVisited = true; // mark it
displayVertex(0); // display it
theStack.push(0); // push it
while( !theStack.isEmpty() ) // until stack empty,
{
// get an unvisited vertex adjacent to stack top
int v = getAdjUnvisitedVertex( theStack.peek() );
if(v == -1) // if no such vertex,
theStack.pop(); // pop a new one
else // if it exists,
{
vertexList[v].wasVisited = true; // mark it
displayVertex(v); // display it
theStack.push(v); // push it
}
} // end while
// stack is empty, so we're done
for(int j=0; j<nVerts; j++) // reset flags
vertexList[j].wasVisited = false;
} // end dfs