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該程序的目的是生成一個由週期組成的二維網格數組。用戶將在網格上指定要放置的「步行者」的座標，標記爲'A'。步行者將選擇隨機的主要方向進入，每次選擇一個新的方向，並用字母表中的下一個字母標記它，直到達到「Z」，或者直到它超出邊界。如果它到達一個已經存在的空間，它將檢查其他三個方向並移動到它找到的下一個空白區域。在二維步行網格數組中跳過空格
該程序大部分運行良好，但通常在運行的中點附近會跳過幾個空格，或者留出空隙，或者顯示爲斜向移動（不應該）。
import java.lang.Math;
import java.util.Random;
import java.util.Scanner;
class DrunkWalker {
private char[][] walkgrid = new char[10][10];
private static int randNSEW;
private static int randNSEWS;
private int randomnum;
private int startrow;
private int startcol;
private char alpha = 'A';
private int nextrow;
private int nextcol;
public DrunkWalker(int r, int c) {
startrow = r;
startcol = c;
nextrow = startrow;
nextcol = startcol;
for (int i = 0; i < 10; i ++) {
//Fills walkgrid with periods.
for (int j = 0; j < 10; j++)
walkgrid[i][j] = '.';
}
walkgrid[r][c] = alpha++;
}
public static void getRand(){
//Generates number between 0-3
int x100 = 0;
double randomNum = 0.0;
randomNum = Math.random();
x100 = (int) (randomNum * 100);
randNSEW = x100 % 4;
}
public static void getRandSecundus(){
//Generates number between 0-2 for corrections
int x100 = 0;
double randomNum = 0.0;
randomNum = Math.random();
x100 = (int) (randomNum * 100);
randNSEWS = x100 % 3;
}
public int getNextRow(){
return nextrow;
}
public int getNextCol(){
return nextcol;
}
enum Mode {WALKING, CORRECTING};
Mode mode = Mode.WALKING;
public boolean processing(){
for(int i = 1; i < 26; i ++){ //Goes until it hits Z
if (mode == Mode.WALKING) {
getRand(); //Retrieves random direction
if(randNSEW == 0){
nextcol--; //west
}
if(randNSEW == 1){
nextrow++; //south
}
if(randNSEW == 2){
nextcol++; //east
}
if(randNSEW == 3){
nextrow--; //north
}
}
//if walker goes out of bounds they are arrested.
if(nextrow < 0 || nextrow >= 10 || nextcol < 0 || nextcol >= 10) {
return false;
}
if(randNSEW == 0 && walkgrid[nextrow][nextcol] != '.'){
//If walker headed west and lands somewhere it has already been
i--; //Sets the counter back so it won't go further than Z.
nextcol++; //Moves back in to place.
mode = Mode.CORRECTING;
getRandSecundus(); //Calls for secondary random number.
if(randNSEWS == 0){
nextrow++; //Check South.
}
if(randNSEWS == 1){
nextcol++; //Check East.
}
if(randNSEWS == 2){
nextrow--; //Check North.
}
continue;
}
if(randNSEW == 1 && walkgrid[nextrow][nextcol] != '.'){
//If walker headed south and lands somewhere it has already been
i--; //Sets the counter back so it won't go further than Z.
nextrow--; //Moves back in to place.
mode = Mode.CORRECTING;
getRandSecundus(); //Calls for secondary random number.
if(randNSEWS == 0){
nextcol--; //Check West
}
if(randNSEWS == 1){
nextcol++; //Check East
}
if(randNSEWS == 2){
nextrow--; //Check North
}
continue;
}
if(randNSEW == 2 && walkgrid[nextrow][nextcol] != '.'){
//If walker headed east and lands somewhere it has already been
i--; //Sets the counter back so it won't go further than Z.
nextcol--; //Moves back in to place.
mode = Mode.CORRECTING;
getRandSecundus(); //Calls for secondary random number.
if(randNSEWS == 0){
nextcol--; //Check West
}
if(randNSEWS == 1){
nextrow++; //Check South
}
if(randNSEWS == 2){
nextrow--; //Check North
}
continue;
}
if(randNSEW == 3 && walkgrid[nextrow][nextcol] != '.'){
//If walker headed north and lands somewhere it has already been
i--; //Sets the counter back so it won't go further than Z.
nextrow++; //Moves back in to place.
mode = Mode.CORRECTING;
getRandSecundus();
if(randNSEWS == 0){
nextcol--; //Check West
}
if(randNSEWS == 1){
nextrow++; //Check South
}
if(randNSEWS == 2){
nextcol++; //Check East
}
continue;
}
mode = Mode.WALKING;
walkgrid[nextrow][nextcol] = alpha++;
}
return true;
}
public char[][] DisplayGrid() {
for(int y = 0; y < 10; y++) {
for(int x = 0; x < 10; x++) {
System.out.print(walkgrid[x][y] + " ");
}
System.out.println();
}
return walkgrid;
}
}
public class WalkTester {
public static void main(String[] args) {
Scanner inpr = new Scanner(System.in);
Scanner inpc = new Scanner(System.in);
Scanner inpchoice = new Scanner(System.in);
int r = 0;
int c = 0;
char choice = 'y';
while(choice == 'y' || choice == 'Y') {
System.out.println("Please enter x coordinate between 1 and 10.");
r = inpr.nextInt();
r = r - 1;
System.out.println("Please enter y coordinate between 1 and 10");
c = inpr.nextInt();
c = c - 1;
if(r < 0 || r > 9 || c < 0 || c > 9){
System.out.println("Invalid Entry. Restart? y/n");
choice = inpchoice.next().charAt(0);
if(choice == 'y' || choice == 'Y'){
continue;
}
else if(choice == 'n' || choice == 'N'){
return;
}
else{
System.out.println("Invalid Entry. Restart? y/n");
choice = inpchoice.next().charAt(0);
}
}
DrunkWalker drunkwalker = new DrunkWalker(r, c);
boolean walkerSucceeded = drunkwalker.processing();
drunkwalker.DisplayGrid();
if(walkerSucceeded) {
System.out.println("You made it home");
} else {
System.out.println("You were arrested");
}
System.out.println("Restart? y/n");
choice = inpchoice.next().charAt(0);
if(choice == 'y' || choice == 'Y'){
continue;
}
else if(choice == 'n' || choice == 'N'){
return;
}
else{
System.out.println("Invalid Entry. Restart? y/n");
choice = inpchoice.next().charAt(0);
}
}
}
}
你一直在遊行這個程序很長時間 - 你有沒有給過幫助你的人點？ – gpasch
是的，我只是沒有足夠的代表，所以它不顯示。 –