java - 为什么我的整数增加了 2 而不是 1？

Question

我正在做汉诺塔作业作为家庭作业。我试图每次将 i 变量增加 1，但它增加了 2。此外， ("[g]et, [p]ut... 字符串被打印两次，而不是一次。发生了什么事？!请帮忙!>

我尝试添加一个 i--;在 if (p) 上，但这不起作用。

import java.util.Scanner;

/**
 * Simulates a tower that can hold disks.
 * @author S. Camilleri
 * @author <your name>
 */
public class TowersOfHanoi {
    public static void main(String[] args) { 
        Scanner input = new Scanner(System.in);

        // This array holds the disks. A 0 represents no disk.
        int[] tower = new int[5];

        // This index represents the first available empty spot for a disk.
        int index = 0;

        int towerCounter = 0;
        int length = tower.length;

        boolean playing = true;    
        while (playing)
        {
            /********************
             * Display the tower
             ********************/
            System.out.println();
            System.out.print("{ ");

            while (towerCounter < length) {
                tower[towerCounter] = 0;
                System.out.print(tower[towerCounter]);
                towerCounter = towerCounter + 1;
            }
            String choice;
            int size;
            for (int i=0; i<length; i++) {

                /********************
                 * Get action from user
                 ********************/      
                System.out.println();      
                System.out.println("[g]et, [p]ut or [e]xit?");
                choice = input.nextLine();

                // Get
                if (choice.equals("g"))
                {
                    tower[i] = 0;

                    System.out.println();

                    towerCounter = 0;
                    i--;
                    System.out.print("{ ");

                    while (towerCounter < length) {

                        System.out.print(tower[towerCounter]);
                        towerCounter = towerCounter + 1;
                    }

                }

                // Put
                else if (choice.equals("p"))
                {
                    System.out.println("Disk?");
                    size = input.nextInt();
                    tower[i] = size;
                    towerCounter = 0;


                    System.out.print("{ ");
                    while (towerCounter < length) {

                        System.out.print(tower[towerCounter]);
                        towerCounter = towerCounter + 1;
                    }
                }

                // Exit
                else if (choice.equals("e"))
                {
                    playing = false; 
                }
            }
        }
    } 
}

我发布了整个代码，作为回答者的请求。

Answer 1

("[g]et, [p]ut... 字符串被打印两次，因为在您给出输入并按 Enter 键后，for 循环将针对您给出的输入运行一次，并再运行一次输入后按下“enter”按钮

根据你想要的，在 else if (choice.equals("p")) 这个 elsed if block 中减少 i

 else if (choice.equals("p")){
//your code
i--;
}