我已经设计了战舰游戏，只有一艘船隐藏，现在我必须实现另一艘船到游戏中。我是java新手，想知道是否有人能给我一个简单的方法来解决这个问题。我需要创建另一个方法还是调整display river方法？

public static void displayRiver(int[] river, boolean showShip) {
            System.out.println();
            System.out.print("|");
            for (int val : river) {
                switch (val) {
                    case -1: // No Ship
                    System.out.print("x");
                    break;
                    case 0: // Unknown
                    System.out.print(" ");
                    break;
                    case 1: // Ship Found
                    System.out.print(showShip ? "Y" : " ");
                    break;
                }//switch
                System.out.print("|");
            }//for
            System.out.println();
            System.out.println();
        }//displayRiver

        // main method
        public static void main(String[] arg) {
            int riverLength = promptForInt("Please, enter the river lenght"); 
            int [] shipArray = new int[riverLength]; 

            int randomBattleshipLocation = new Random().nextInt(riverLength); 
            shipArray[randomBattleshipLocation] = 1; 

            boolean showShip = false ; 
            int userGuess; 

            do
            {
                displayRiver (shipArray, false);
                userGuess = promptForInt(String.format("Guess, enter a location from 1 to " + riverLength));
                userGuess = userGuess -1; 

                if(shipArray[userGuess] == 1) 
                {
                    System.out.println("Boom! ");
                    showShip = true; 
                    displayRiver(shipArray, true);
                }
                else if(shipArray[userGuess] == -1)
                {
                    System.out.println("Location was already hit, try again! ");
                }
                else if(shipArray[userGuess] == 0) 
                {
                    System.out.println("Splash...");
                    shipArray[userGuess] = -1 ; 
                }

            } while(!showShip); 

            System.exit(0);

        }
    }