我在类级别（gameGrid）声明了一个数组，然后我在一个方法中进行了更改，但现在我需要采用这种改变的方法（现在填充"."）并做更多另一种方法（printGrid）。我的教授在评论中帮助我处理了包含JRD的所有代码，所以我需要保留这些想法。我有return声明，但这并不能帮助解决问题。这个程序是一个非常简单的PacMan游戏。我使用的是Java 8，但只能使用最基本的概念：变量，基本数据类型，数组，控制语句，字符串方法，只有一个类，并且有多种方法都可以。
import java.util.Scanner;
public class PacManGame
{
static char [][] gameGrid; // Define here so all methods can use it. JRD.
static int X, Y; //Variables for number of grid rows X, and columns Y
public static void main(String[] args)
{
int numMoves; // How to keep track of # of moves user makes before winning game
Scanner input = new Scanner( System.in );
System.out.println();
System.out.print( "Enter the number of rows you would like in your game grid: " );
X = input.nextInt();
System.out.println();
System.out.print( "Enter the number of columns you would like in your game grid: " );
Y = input.nextInt();
System.out.println();
buildGrid(X, Y); // Calls buildGrid method
playGame(); // Need to start the game which includes printing the menu. JRD.
} // Closes main method
public static void buildGrid(int X, int Y) // Return the built grid so other methods can use it. JRD. // Method for actually building the grid
{
gameGrid = new char[X][Y]; // Array built from user's input for dimensions, with char. Defined at class level. JRD.
int totalGridSize = X * Y; // Gets the total grid size
int cookieTotal = totalGridSize / 5; // Calculates the 20% of cookies that will be on grid
int theCookies = (int)(cookieTotal*Math.random())+1; //Assigns the randomly generated number
int i, j, k = 0; // Initialize loop counters
for (i = 0; i < X; i++)
{
for (j = 0; j < Y; j++)
{
gameGrid[i][j] = '.';
}
}
return gameGrid[i][j];
} // Closes buildGrid method
public static void printGrid()
{
char currentGrid [][] = new gameGrid[i][j];
currentGrid[0][0] = '<';
}
}
编辑：以下是我的新代码：
import java.util.Scanner;
public class PacManGame
{
static char [][] gameGrid; // Define here so all methods can use it. JRD.
static int X, Y; //Variables for number of grid rows X, and columns Y
static int theCookies;
public static void main(String[] args)
{
int numMoves; // How to keep track of # of moves user makes before winning game
Scanner input = new Scanner( System.in );
System.out.println();
System.out.print( "Enter the number of rows you would like in your game grid: " );
X = input.nextInt();
System.out.println();
System.out.print( "Enter the number of columns you would like in your game grid: " );
Y = input.nextInt();
System.out.println();
buildGrid(X, Y); // Calls buildGrid method
playGame(); // Need to start the game which includes printing the menu. JRD.
} // Closes main method
public static char[][] buildGrid(int X, int Y) // Return the built grid so other methods can use it. JRD. // Method for actually building the grid
{
gameGrid = new char[X][Y]; // Array built from user's input for dimensions, with char. Defined at class level. JRD.
int totalGridSize = X * Y; // Gets the total grid size
int cookieTotal = totalGridSize / 5; // Calculates the 20% of cookies that will be on grid
theCookies = (int)(cookieTotal*Math.random())+1; //Assigns the randomly generated number
int i, j = 0; // Initialize loop counters
for (i = 0; i < X; i++)
{
for (j = 0; j < Y; j++)
{
gameGrid[i][j] = '.';
}
}
return gameGrid;
} // Closes buildGrid method
public static char[][] printGrid(char[][] gameGrid )
{
gameGrid[0][0] = '<';
int i, j = 0;
for (i = 0; i < X; i++)
{
for (j = 0; j < Y; j++)
{
gameGrid[theCookies][theCookies] = 'O';
}
}
return gameGrid;
}
public static void printMenu()
{
System.out.println();
System.out.println( "Choose from the following menu:");
System.out.println( "1) Turn left");
System.out.println( "2) Turn right");
System.out.println( "3) Move");
System.out.println( "4) Exit");
}
// public static int playGame(int choice)
public static void playGame() // Don't need to return anything. Add passed grid. JRD.
{
int numMoves = 0; // Move declaration here. JRD. // Will be used to keep track of # of moves
int choice; // This is only used locally and not externally. JRD.
do
{
printGrid(gameGrid); // Print grid JRD.
printMenu(); // Print menu for each command. JRD.
Scanner input = new Scanner( System.in );
System.out.print( "Enter your menu choice (1-4): ");
choice = input.nextInt();
switch (choice)
{
case 1:
System.out.print(">");
break;
case 2:
System.out.print("^");
break;
case 3:
System.out.print("V");
numMoves++;
break;
}
System.out.println( "If you would like to see the menu again, enter 1: " );
int menuChoice = input.nextInt();
if (menuChoice == 1)
{
printMenu();
break;
}
}
while (choice != 4);
System.out.print( "Thanks for playing! You took " + numMoves + " moves to eat all the cookies." );
} // Closes playGame method
} // Closes PacManGame class
答案 0 :(得分：0)
让网格创建方法返回网格
public static char[][] buildGrid(int X, int Y) // Return the built grid so other methods can use it. JRD. // Method for actually building the grid
{
char[][] gameGrid = new char[X][Y]; // Array built from user's input for dimensions, with char. Defined at class level. JRD.
// the same as original code, omitted
return gameGrid;
} // Closes buildGrid method
并将网格修改方法传递给网格并进行修改
public static void printGrid(char[][] currentGrid)
{
currentGrid[0][0] = '<';
}
如何使用方法：
char[][] grid = buildGrid(X, Y);
putStartOnGrid(grid);
另一个选择：你使gameGrid成为一个成员属性，所以你可能不想返回它并且让函数只使用成员属性。
public static void buildGrid(int X, int Y) // Return the built grid so other methods can use it. JRD. // Method for actually building the grid
{
gameGrid = new char[X][Y]; // Array built from user's input for dimensions, with char. Defined at class level. JRD.
// the same as original code, omitted
// remove the return statement
} // Closes buildGrid method
public static void printGrid()
{
// you already have built gameGrid, so you don't have to try to create it again here
gameGrid[0][0] = '<';
}