Java - 根据用户输入移动2d阵列中的位置(并打印出当前位置)

时间:2015-11-04 11:24:24

标签: java arrays position

我有一个程序,用户在命令U,D,R,L中写入。根据用户命令,我希望位置在2D数组中移动。例如,如果用户编写了UDUDU,那么我希望该位置可以进入' '下' '向上' '下' '向上&#39 ;.到目前为止,我只能设法移动它一次"。我想我必须更新当前的位置,它在这里我遇到了麻烦,我需要帮助!

例如,使用决定尺寸[3] [3]和位置[1] [1]。

  0 1 2 
0 0 0 0
1 0 1 0
2 0 0 0

如果用户按下UDUDU,那么新位置就像这样(在这种情况下x为+1)

  0 1 2 
0 0 0 0
1 0 0 0
2 0 1 0

以下是代码:

 Scanner scan = new Scanner(System.in);

 System.out.println("Enter length(x) and width(y)");
                    x = scan.nextInt();
                    y = scan.nextInt();

  int[][] roomsize = new int[x][y];//The array

  System.out.println("Enter the starting position");
                    x = scan.nextInt();
                    y = scan.nextInt();

  roomsize[x][y] = 1; //Starting position


System.out.println("Enter commands U(up), D(down), R(right) or  L(left)");//User input          
                   String command = scan.next();    

for (char directionCommand : command.toCharArray()){
                      move(directionCommand, roomsize, x, y);

                     }
                //Should I print it out here? It   
                /*for(int i = 0; i < roomsize.length; i++)
                   {
                      for(int j = 0; j < roomsize[i].length; j++)
                        {
                            System.out.print(roomsize[i][j]);
                            if(j < roomsize[i].length - 1)     System.out.print(" ");
                        }
                        System.out.println();
                    }*/


public static void move(int i, int[][] roomsize, int x, int y){
                    int px = 0;//Current position
                    int py = 0;//Current position
                    switch(i){
                  case 'U': px+=1; break;//Is this the right way to update position?
                  case 'D': roomsize[x-1][y]; break;//Or this waY?
                  case 'R': roomsize[x][y+1] = 1; break;
                  case 'L': roomsize[x][y-1] = 1;break;                
                  default:; break;
                  }             
                    roomsize[px][py] = 1;//Do I set the new position like this?

 for(int i1 = 0; i1 < roomsize.length; i1++)
                       {
                          for(int j = 0; j < roomsize[i1].length; j++)
                            {
                                System.out.print(roomsize[i1][j]);
                                if(j < roomsize[i1].length - 1) System.out.print(" ");
                            }
                            System.out.println();
                        }  

还有我需要的时间和地点&#34;打印出来&#34;数组中的位置?在switch语句之后完成它似乎是错误的吗?要么?先谢谢你们!

1 个答案:

答案 0 :(得分:0)

有道理,您只能移动一次。您的for循环之外有用户输入。

String command = scan.next(); 

在循环之前读入,然后命令长度用作for循环

for (char directionCommand : command.toCharArray())

我会尝试使用while循环

 Scanner scan = new Scanner(System.in);

 System.out.println("Enter length(x) and width(y)");
                    x = scan.nextInt();
                    y = scan.nextInt();

  int[][] roomsize = new int[x][y];//The array

  System.out.println("Enter the starting position");
                    x = scan.nextInt();
                    y = scan.nextInt();

  roomsize[x][y] = 1; //Starting position


while(true){
System.out.println("Enter commands U(up), D(down), R(right),  L(left), and Q(quit)");//User input
    String command = scan.next();
if(command.equalsIgnoreCase("Q"){
    break;
}
    move(command.charAt(0), roomsize, x, y);
}