当输入超出范围时，如何使do-while循环停止？

Question

我已经为此工作了几个小时！ 我觉得解决方案可能真的很简单，但我一生都看不出来。

我想知道当var1或var 2的用户输入超出范围时，如何使userInput（）部分中的do-while循环实际停止。 小于0或大于10。这是原始问题：

修改PlayLife，以便用户可以输入一系列的行，在1到10之间的col坐标以使细胞存活。 输入小于1或大于10的值将表明用户完成操作。

import java.util.Scanner;
public class PlayLife
{
public static void main(String[] args)
{int answer;
    World myWorld = new World(10, 10);

    System.out.println("Enter a row and column number between 1 and 10 to make a cell live:");
    myWorld.userInput();
    System.out.println(myWorld);
    System.out.println();`

世界

import java.util.Scanner;
import java.util.Random;
public class World
{
    private Cell[][] board;  //a 2 dimensional array of Cells called board
    private int rows;
    private int cols;
    int var1 = 0, var2 = 0 , test;
    int row, col;

public World(int numOfRows, int numOfCols)
{
    int row, col;
    rows = numOfRows;
    cols = numOfCols;
    board = new Cell[rows][cols];
            //the following nested loop creates the rows X cols array of "dead" Cells

    for(row = 0; row < rows; row++)
        for(col = 0; col < cols; col++)
            board[row][col] = new Cell(false); 
}

public boolean getStatus(int row, int col)
{
    return board[row][col].getStatus();
}
public void setStatus(int row, int col, boolean status)
{
    board[row][col].setStatus(status);
}
public void makeAlive(int row, int col)
{
    board[row][col].setStatus(true);
}
public void makeDead(int row, int col)
{
    board[row][col].setStatus(false);
}
public void userInput()
{
    Scanner keyboard = new Scanner(System.in);
    for(col = 0; col < cols; col++)
        for(row = 0; row < rows; row++)
            do
            {
                var1 = keyboard.nextInt();
                var2 = keyboard.nextInt();
            }
            while(var1 < 0 || var1 >= 10 || var2 < 0 || var2 >= 10);
        board[var1][var2].setStatus(true);


}           
public void randomFill()
{
    int row, col;
    Random pick = new Random();
    for(row = 0 ; row < rows; row++)
        for(col = 0; col < cols; col++)
            if(pick.nextInt(4)==0)  //make 25% of the cells alive 
                board[row][col].setStatus(true);
}

public String toString()
{
    String boardPic = "";  //start with an empty string
    int row, col;

    for(row = 0; row < rows; row++)
    {
        for(col = 0; col < cols; col++)
            if(board[row][col].getStatus())
                boardPic = boardPic + "X"; //if the cell is alive, add an X to it
            else
                boardPic = boardPic + "."; //otherwise adda dot
        boardPic = boardPic + "\n";                //after finishing all columns in a row, add a newline character
    }
    return boardPic;
}
    // counts all live cells in a 3 X 3 array then subtracts 1 if the center cell is alive
private int countNeighbors(int curRow, int curCol)
{
    int row, col, neighbors = 0;

    for(row = curRow - 1; row <= curRow + 1; row++)
        for(col = curCol - 1; col <= curCol + 1; col++)
            if(board[row][col].getStatus())
                neighbors++;

            //Is the center cell alive?
    if(board[curRow][curCol].getStatus())
        neighbors--;
    return neighbors;
}
    //The outside edge is already dead, so this only processes row 1-8 and column 1-8
    //if a cell has three neighbors, it will be alive regardless of its current status
    //if a cell has two neighbors, it will be the same in the next gen as the last.
public void nextGen()
{
    World nextOne = new World(rows, cols);  //makes a new "scratch" array
    int row, col, neighbors;

    for(row = 1; row < rows - 1; row++)
        for(col = 1; col < cols - 1; col++)
        {
            neighbors = countNeighbors(row, col);
            if(neighbors == 3)
                nextOne.makeAlive(row, col);
            else if (neighbors == 2)
                nextOne.setStatus(row, col, this.getStatus(row, col));  //"this" refers to the object performing the method
        }
    //copy new world just created to exixting world
    for(row = 0; row < rows; row++)
        for(col = 0; col < cols; col++)
            board[row][col].setStatus(nextOne.board[row][col].getStatus());
    }
}

这是另一个。 这个没有什么错，我只是将其发布，以防万一您希望看到它

   public class Cell
{

private boolean status;  //true = alive, false = dead

public Cell(boolean aliveOrDead)  //one parameter constructor
{
    status = aliveOrDead;
}

public void setStatus(boolean aliveOrDead)  //mutator to set the status of the cell via the parameter
{
    status = aliveOrDead;
}

public boolean getStatus()  //acessor to get the current status
{
    return status;
}
}

Answer 1

塞思是对的。 您在while内使用的表达方式与您要实现的目的不正确。 如果将其替换为Seth给您的代码，则应该没问题。 现在，您的代码仅对您不希望执行的值执行。

所以像这样

do
            {
                var1 = keyboard.nextInt();
                var2 = keyboard.nextInt();
            }
            while((var1 > 0 && var1 < 10) && (var2 > 0 && var2 < 10));