當輸入超出范圍時，如何使do-while循環停止？

Question

我已經為此工作了幾個小時！ 我覺得解決方案可能真的很簡單，但我一生都看不出來。

我想知道當var1或var 2的用戶輸入超出范圍時，如何使userInput（）部分中的do-while循環實際停止。 小於0或大於10。這是原始問題：

修改PlayLife，以便用戶可以輸入一系列的行，在1到10之間的col坐標以使細胞存活。 輸入小於1或大於10的值將表明用戶完成操作。

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());
    }
}

這是另一個。 這個沒有什么錯，我只是將其發布，以防萬一您希望看到它

   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

塞思是對的。 您在while內使用的表達方式與您要實現的目的不正確。 如果將其替換為Seth給您的代碼，則應該沒問題。 現在，您的代碼僅對您不希望執行的值執行。

所以像這樣

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