package edu.bsu.cs121.mamurphy;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
// Maurice Murphy
// CS121
// 10/17/15
public class GameOfLifeMain extends JFrame {
// Intitial reading and printing of the world
public GameOfLifeMain() {
super("Game of Life");
setSize(600, 445);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 2));
Test test1 = new Test();
test1.setBackground(Color.LIGHT_GRAY);
panel.add(test1);
setContentPane(panel);
setVisible(true);
Temp one = new Temp(test1);
one.start();
}
public static void main(String[] asd) {
new GameOfLifeMain();
System.out.println();
}
}
class Temp extends Thread {
Test anim;
public Temp(Test anim) {
this.anim = anim;
}
public void run()// for each instance of test begin will be executed
{
anim.begin();
}
}
class Test extends JPanel
{
final static int numOfRow = 25, numOfCol = 75;
final static char DOT = '.';
static char[][] grid = new char[numOfRow + 2][numOfCol + 2];
static char[][] nextgrid = new char[numOfRow + 2][numOfCol + 2];
boolean sameFlag;
boolean blankFlag;
public static void init(char[][] grid, char[][] nextgrid) {
for (int numOfRow = 0; numOfRow <= numOfRow + 1; numOfRow++) {
for (int numOfCol = 0; numOfCol <= numOfCol + 1; numOfCol++) {
grid[numOfRow][numOfCol] = DOT;
nextgrid[numOfRow][numOfCol] = DOT;
}
}
}
public static void pause() {
try {
Thread.currentThread();
Thread.sleep(1000L);
} catch (InterruptedException e) {
}
}
public void begin() {
init(grid, nextgrid);
read(grid);
repaint(); // calls paintComponent
pause();
while (sameFlag == true && blankFlag == false) {
nextGen(grid, nextgrid);
}
}
public static void read(char[][] grid) {
Scanner world = new Scanner(System.in);
System.out.println("Type the file name of the world you'd like to create.");
String fileName = world.nextLine();
{
try {
world = new Scanner(new File(fileName));
} catch (Exception ex) {
System.out.println("Please insert a valid file name.");
}
;
for (int numOfRow = 1; numOfRow <= numOfRow; numOfRow++) {
String s = world.next();
for (int numOfCol = 1; numOfCol <= numOfCol; numOfCol++) {
grid[numOfRow][numOfCol] = s.charAt(numOfCol - 1);
}
}
}
}
public void print(Graphics g) {
int x, y;
y = 20;
for (int numOfRow = 1; numOfRow <= numOfRow; numOfRow++) {
x = 20;
for (int numOfCol = 1; numOfCol <= numOfCol; numOfCol++) {
g.drawString("" + grid[numOfRow][numOfCol], x, y);
x = x + 7;
}
y = y + 15;
}
}
public static int neighbors(char[][] grid, int r, int c) {
// counts the # of closest neighbors that are X's
int count = 0;
for (int numOfRow = r - 1; numOfRow <= r + 1; numOfRow++) {
for (int numOfCol = c - 1; numOfCol <= c + 1; numOfCol++) {
if (grid[numOfRow][numOfCol] == 'X') {
count++;
}
}
}
if (grid[r][c] == 'X') {
count = count - 1;
}
return count;
}
public static void nextGen(char[][] grid, char[][] nextgrid) {
for (int numOfRow = 1; numOfRow <= numOfRow; numOfRow++) {
for (int numOfCol = 1; numOfCol <= numOfCol; numOfCol++) {
if (grid[numOfRow][numOfCol] == 'X') {
int count = 0;
{
if (grid[numOfRow][numOfCol - 1] == 'X')
count = count + 1;
if (grid[numOfRow][numOfCol + 1] == 'X')
count = count + 1;
if (grid[numOfRow - 1][numOfCol] == 'X')
count = count + 1;
if (grid[numOfRow - 1][numOfCol - 1] == 'X')
count = count + 1;
if (grid[numOfRow - 1][numOfCol + 1] == 'X')
count = count + 1;
if (grid[numOfRow + 1][numOfCol - 1] == 'X')
count = count + 1;
if (grid[numOfRow + 1][numOfCol] == 'X')
count = count + 1;
if (grid[numOfRow + 1][numOfCol + 1] == 'X')
count = count + 1;
}
if (count == 2 || count == 3) {
nextgrid[numOfRow][numOfCol] = 'X';
} else
nextgrid[numOfRow][numOfCol] = DOT;
}
if (grid[numOfRow][numOfCol] == DOT) {
int count1 = 0;
{
if (grid[numOfRow][numOfCol - 1] == 'X')
count1 = count1 + 1;
if (grid[numOfRow][numOfCol + 1] == 'X')
count1 = count1 + 1;
if (grid[numOfRow - 1][numOfCol] == 'X')
count1 = count1 + 1;
if (grid[numOfRow - 1][numOfCol - 1] == 'X')
count1 = count1 + 1;
if (grid[numOfRow - 1][numOfCol + 1] == 'X')
count1 = count1 + 1;
if (grid[numOfRow + 1][numOfCol - 1] == 'X')
count1 = count1 + 1;
if (grid[numOfRow + 1][numOfCol] == 'X')
count1 = count1 + 1;
if (grid[numOfRow + 1][numOfCol + 1] == 'X')
count1 = count1 + 1;
}
if (count1 == 3)
nextgrid[numOfRow][numOfCol] = 'X';
}
}
}
}
public static void copy(char[][] grid, char[][] nextgrid) {
for (int i = 0; i < numOfRow + 1; i++) {
for (int j = 0; j < numOfCol + 1; j++) {
grid[i][j] = nextgrid[i][j];
}
}
}
public static boolean isEmpty(char[][] grid, char[][] nextgrid) {
boolean blankFlag = true;
for (int i = 0; i < numOfRow + 1; i++) {
for (int j = 0; j < numOfCol + 1; j++) {
if (grid[i][j] != DOT) {
blankFlag = false;
}
}
}
return blankFlag;
}
public static boolean isSame(char[][] grid, char[][] nextgrid) {
boolean sameFlag = false;
for (int i = 0; i < numOfRow + 1; i++) {
for (int j = 0; j < numOfCol + 1; j++) {
if (grid[i][j] == nextgrid[i][j]) {
sameFlag = true;
break;
}
}
}
return sameFlag;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);// erases panel Contents
g.setColor(Color.black);
if (sameFlag == false && blankFlag == false) {
print(g);// or whatever method you use to print the world
} else {
if (sameFlag == true) {
g.drawString("The worlds are repeating!", 10, 250);
}
if (blankFlag == true) {
g.drawString("The world is blank!", 10, 250);
}
}
}
}
所以我正在为我的CS121 java类中的作业编写这个编码，这是Conway的生命游戏。代码背后的想法是用户键入文件名（文本文件），其具有句点和x的网格。期间是死细胞，x是活细胞。
当我尝试输入文件名时，它会自动将我引发到异常并说Please insert a valid file name.
如果我再次尝试输入文件名，则会出现此错误。
Exception in thread "Thread-2" java.lang.StringIndexOutOfBoundsException: String index out of range: 9
at java.lang.String.charAt(Unknown Source)
at edu.bsu.cs121.mamurphy.Test.read(GameOfLifeMain.java:103)
at edu.bsu.cs121.mamurphy.Test.begin(GameOfLifeMain.java:79)
at edu.bsu.cs121.mamurphy.Temp.run(GameOfLifeMain.java:46)
所以我得到的一个答案是，我需要提示我在一个循环中询问用户文件名，只有在文件名成功打开时才会发生。我怎么能这样做呢？
答案 0 :(得分：0)
在捕获尝试打开文件的异常后，您的代码将继续进入循环以从文件中读取（未打开）。由于扫描程序（世界）仍然分配给System.in，因此下次尝试输入文件名将作为文件中的第一行处理。由于您输入的名称短于预期的列数，因此在's.charAt（numOfCol - 1）'
处获得超出范围异常的索引您需要在循环中提示您输入文件名，该循环仅在文件成功打开时退出。