我的while循环工作两次然后停止工作

Question

这是一个tic tac toe程序，您看到的部分是用户和计算机决策。我有两个while循环，当我运行它时，用户去，计算机响应两次，然后发生一些事情，计算机停止在用户之后移动。用户可以在不首先使用计算机的情况下进行移动。我不知道为什么，有人可以帮忙。

代码

            while(!userDone)
            {
                if(input == 1 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X1s1); 
                    g2.draw(X1s2);
                    userDone = true;
                }
                else if(input == 2 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X2s1);
                    g2.draw(X2s2);
                    userDone = true;
                }
                else if(input == 3 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X3s1);
                    g2.draw(X3s2);
                    userDone = true;
                }
                else if(input == 4 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X4s1);
                    g2.draw(X4s2);
                    userDone = true;
                }
                else if(input == 5 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X5s1);
                    g2.draw(X5s2);
                    userDone = true;
                }
                else if(input == 6 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X6s1);
                    g2.draw(X6s2);
                    userDone = true;
                }
                else if(input == 7 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X7s1);
                    g2.draw(X7s2);
                    userDone = true;
                }
                else if(input == 8 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X8s1);
                    g2.draw(X8s2);
                    userDone = true;
                }
                else if(input == 9 && !grid.previousInputs.contains(input))
                {
                    grid.previousInputs.add(input);
                    g2.draw(X9s1);
                    g2.draw(X9s2);
                    userDone = true;
                }
                else
                {
                    g2.drawString("Input Error: Please input a number 1 - 9", 200, 30);
                    userDone = false;
                }
            }

            while(userDone)
            {
                if(!grid.previousInputs.contains(5))
                {
                   g2.draw(O5);
                   grid.previousInputs.add(5);
                   userDone = false;
                }
                else if(!grid.previousInputs.contains(1))
                {
                    g2.draw(O1);
                    grid.previousInputs.add(1);
                    userDone = false;
                }
                else if(!grid.previousInputs.contains(3))
                {
                    g2.draw(O3);
                    grid.previousInputs.add(3);
                    userDone = false;
                }
                else if(!grid.previousInputs.contains(7))
                {
                    g2.draw(O7);
                    grid.previousInputs.add(7);
                    userDone = false;
                }
                else if(!grid.previousInputs.contains(9))
                {
                    g2.draw(O9);
                    grid.previousInputs.add(9);
                    userDone = false;
                }
                else if(!grid.previousInputs.contains(2))
                {
                    g2.draw(O2);
                    grid.previousInputs.add(2);
                    userDone = false;
                } 
                else if(!grid.previousInputs.contains(4))
                {
                    g2.draw(O4);
                    grid.previousInputs.add(4);
                    userDone = false;
                }
                else if(!grid.previousInputs.contains(6))
                {
                    g2.draw(O6);
                    grid.previousInputs.add(6);
                    userDone = false;
                }
                else
                {
                    g2.draw(O8);
                    grid.previousInputs.add(8);
                    g2.drawString("Game Over!", 200, 230);
                }

            }