[英]Why won't my while loop if condition work correctly?
我的checkWin
方法返回false
直到在Connect 4游戲中獲勝為止,方法是將4個“棋子”水平,垂直或對角地放置在我的棋盤陣列中。 一旦有贏家, checkWin
方法將返回true,然后迭代最接近的if語句,打印出贏家,然后終止整個循環(如果我對所有代碼進行了正確編碼)。 但是,當我運行程序時,while循環僅迭代一次,為紅色接受一個輸入,聲明紅色為贏,然后為黃色執行相同的操作,然后終止。
我在這里想念什么?
以下是相關代碼。
謝謝。
public static void main(String[] args) {
char[][] board = new char[6][7];
boolean loop = true;
// loop to alternate players until there's a winner
while (loop) {
printData(board);
red(board);
if (checkWin(board) == true) {
printData(board);
System.out.print("Red wins!");
loop = false;
}
printData(board);
yellow(board);
if (checkWin(board) == true) {
printData(board);
System.out.print("Yellow wins!");
loop = false;
}
}
}
public static void printData(char[][] tbl) {
for (int r = 0; r < tbl.length; r++) {
for (int c = 0; c < tbl[r].length; c++) {
if (tbl[r][c] == 0) {
System.out.print("| ");
} else {
System.out.print("|" + tbl[r][c]);
}
} // end for col loop
System.out.println("|");
} // end for row loop
System.out.println("---------------");
} // end printData method
public static void red(char[][] f) {
System.out.println("Place a red checker at column (0-6)");
Scanner in = new Scanner(System.in);
int c = in.nextInt();
for (int i = 5; i >= 0; i--) {
if (f[i][c] == 0) {
f[i][c] = 'R';
break;
}
}
}
public static void yellow(char[][] f) {
System.out.println("Place a yellow checker at column (0-6)");
Scanner in = new Scanner(System.in);
int c = in.nextInt();
for (int i = 5; i >= 0; i--) {
if (f[i][c] == 0) {
f[i][c] = 'Y';
break;
}
}
}
// Method to check for a winner. Receives 2-D array as parameter. Returns
// boolean value.
public static boolean checkWin(char[][] b) {
// Create four boolean variables, one for each set of rows. Initialize
// all of them to false.
boolean foundRow = false;
boolean foundCol = false;
boolean foundMjrD = false;
boolean foundMinD = false;
// Check to see if four consecutive cells in a row match.
// check rows
for (int r = 0; r <= 5; r++) {
for (int c = 0; c <= 3; c++) {
if (b[r][c] == b[r][c + 1] && b[r][c] == b[r][c + 2] && b[r][c] == b[r][c + 3] && b[r][c] != ' ') {
foundRow = true;
break;
}
}
}
// Check to see if four columns in the same row match
// check columns
for (int r = 0; r <= 2; r++) {
for (int c = 0; c <= 6; c++) {
if (b[r][c] == b[r + 1][c] && b[r][c] == b[r + 2][c] && b[r][c] == b[r + 3][c] && b[r][c] != ' ') {
foundCol = true;
break;
}
}
}
// Check to see if four diagonals match (top left to bottom right)
// check major diagonal
for (int r = 0; r <= 2; r++) {
for (int c = 0; c <= 3; c++) {
if (b[r][c] == b[r + 1][c + 1] && b[r][c] == b[r + 2][c + 2] && b[r][c] == b[r + 3][c + 3]
&& b[r][c] != ' ') {
foundMjrD = true;
break;
}
}
}
// Check to see if four diagonals in the other direction match (top
// right to bottom left)
// check minor diagonal
for (int r = 0; r <= 2; r++) {
for (int c = 3; c <= 6; c++) {
if (b[r][c] == b[r + 1][c - 1] && b[r][c] == b[r + 2][c - 2] && b[r][c] == b[r + 3][c - 3]
&& b[r][c] != ' ') {
foundMinD = true;
break;
}
}
}
// If ONE of the booleans is true, we have a winner.
// checks boolean for a true
if (foundRow || foundCol || foundMjrD || foundMinD)
return true;
else
return false;
} // end checkWin method
根據我通過調試您的代碼所進行的分析,在將其切換為false之后,您尚未將boolean變量設置為“ true”。 當您脫離疾病后,再次使該布爾變量為“ true”。
希望這對您有幫助。 快樂編碼
您應該仔細看一下這一行:
if (b[r][c] == b[r][c + 1] && b[r][c] == b[r][c + 2] && b[r][c] == b[r][c + 3] && b[r][c] != ' ') {
您檢查b[r][c] != ' '
,但從未在char[][] board
放置空格,因此board [?] [?]的默認值為0。
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