我有一个问题，我不是在寻找我的问题的答案我想帮助找到为什么我的数组，即使在主要的下方开关中指定：case1，case2，case3。我使用了一个for循环，其数组在第5次迭代时停止。但是，当我运行程序时，它只运行一次，我是否正确指定使其运行5次或是否应该以另一种方式声明？提前致谢。我还应该包括eclipse此时没有报告错误，直到它被运行并且仅在第一次输入之后。 文本文件包含
##B##
#---#
#-M-#
#---#
##B##
##B##########
#-----------#
#-----------#
#-----------B
#-----------#
#------M----#
#-----------#
#-----------#
#-----------#
#-----------#
#-----------#
#-----------#
#############
##B#####
#------#
#-M----#
#------#
#------#
#------#
#------#
#####B##
岛屿地图可以在这里找到 [http://rapidshare.com/share/9704FE33EFF98F1C1E71F6F1DF2DC0D4]
这是数组（int i = 0; i＆lt; 5; i ++）但我认为这不是问题，我还可以提供文本文件
这是控制台输出
CS1181 Mouse Island
1. mouseIsland1.txt
2. mouseIsland2.txt
3. mouseIsland3.txt
9. Exit
Please make your selection: 2
Filename: mouseIsland2.txt
Bridge1: 0,0
Bridge2: 0,0
Mouse: 0,0
OUCH! The Mouse fell into the water and died at: 1|1
01
0100000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
0000000000000
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at MouseEscape.runMouseIsland(MouseEscape.java:349)
at MouseEscape.main(MouseEscape.java:71)
结束控制台
import java.io.File;
import java.util.Scanner;
public class MouseEscape {
public static Scanner input = new Scanner(System.in);
public static MouseEscape island1;
public static MouseEscape island2;
public static MouseEscape island3;
private String islandTxt;
private boolean moveDebug;
private int mouseEscaped;
private int mouseDrowned;
private int mouseStarved;
private int islandRows;
private int [] islandCols;
private int runCount;
private int [][] mousePosition;
private int [][] bridgePosition;
private int [][] islandIntArray;
private char [][] islandCharArray;
// main
// Allows the user to select which mouse island map to simulate
public static void main(String[] args) throws Exception
{
System.out.println("CS1181 Mouse Island");
int choice = 0, continueRun = 1;
boolean runResponce = false, correctInput = false;
while (continueRun == 1)
{
System.out.print("\n 1. mouseIsland1.txt"
+ "\n 2. mouseIsland2.txt"
+ "\n 3. mouseIsland3.txt"
+ "\n 9. Exit\n\nPlease make your selection: ");
continueRun = 9;
runResponce = false;
while (correctInput == false){
while (!input.hasNextInt()) {
input.next();
System.out.print("Enter a number 1-3 or 9 to exit.\nPlease make your selection: ");
}
choice = input.nextInt();
if (choice>=1 && choice <=3 || choice == 9){
correctInput = true;
break;
}
}
switch(choice)
{
case 1:
MouseEscape island1 = new MouseEscape("mouseIsland1.txt");
System.out.println("\nFilename: "+island1.getIslandTxt()
+"\nBridge1: "+island1.getBridgePosition(0,0)+","+island1.getBridgePosition(0,1)
+"\nBridge2: "+island1.getBridgePosition(1,0)+","+island1.getBridgePosition(1,1)
+"\nMouse: "+island1.getMousePosition(1,0)+","+island1.getMousePosition(1,1)+"\n");
//island1.drawCharIsland();
for (int i=0;i<5;i++) island1.runMouseIsland();
island1.printIslandStats();
correctInput=false; continueRun=1; break;
case 2:
MouseEscape island2 = new MouseEscape("mouseIsland2.txt");
System.out.println("\nFilename: "+island2.getIslandTxt()
+"\nBridge1: "+island2.getBridgePosition(0,0)+","+island2.getBridgePosition(0,1)
+"\nBridge2: "+island2.getBridgePosition(1,0)+","+island2.getBridgePosition(1,1)
+"\nMouse: "+island2.getMousePosition(1,0)+","+island2.getMousePosition(1,1)+"\n");
//island1.drawCharIsland();
for (int i=0;i<5;i++) island2.runMouseIsland();
island2.printIslandStats();
correctInput=false; continueRun=1; break;
case 3:
MouseEscape island3 = new MouseEscape("mouseIsland3.txt");
System.out.println("\nFilename: "+island3.getIslandTxt()
+"\nBridge1: "+island3.getBridgePosition(0,0)+","+island3.getBridgePosition(0,1)
+"\nBridge2: "+island3.getBridgePosition(1,0)+","+island3.getBridgePosition(1,1)
+"\nMouse: "+island3.getMousePosition(1,0)+","+island3.getMousePosition(1,1)+"\n");
//island1.drawCharIsland();
for (int i=0;i<5;i++) island3.runMouseIsland();
island3.printIslandStats();
correctInput=false; continueRun=1; break;
}
if (runResponce == false)
{
if (continueRun == 1)
{
runResponce = true;
correctInput = false;
}
}
}
input.close();
}
// MouseIslandClass
// Constructs a mouseIslandClass without specifying which mouseIsland to load
public MouseEscape() {
islandTxt = "";
mouseEscaped = 0;
mouseDrowned = 0;
mouseStarved = 0;
islandRows = 0;
runCount = 0;
mousePosition = null;
bridgePosition = null;
islandIntArray = null;
islandCharArray = null;
}
// MouseIslandClass
// Constructs a mouseIslandClass given a mouseIsland map name
public MouseEscape(String _islandTxt) throws Exception{
islandTxt = _islandTxt;
loadIsland();
}
// setIslandTxt
// Sets the mouseIsland filename for the current mouseIsland
public void setIslandTxt(String _islandTxt) throws Exception{
islandTxt = _islandTxt;
}
// getIslandTxt
// Gets the mouseIsland filename for the current mouseIsland
public String getIslandTxt(){
return islandTxt;
}
// getMouseEscaped
// Returns the total number of times a mouse has escaped from the current mouseIsland
public int getMouseEscaped(){
return mouseEscaped;
}
// getMouseDrowned
// Returns the total number of times a mouse has drowned on the current mouseIsland
public int getMouseDrowned(){
return mouseDrowned;
}
// getMouseStarved
// Returns the total number of times a mouse has starved on the current mouseIsland
public int getMouseStarved(){
return mouseStarved;
}
// getBridgePosition
// Returns the coordinate row(x) or column(y) to either of the bridges on the current mouseIsland
public int getBridgePosition(int x, int y){
return bridgePosition[x][y];
}
// getMousePosition
// Returns the coordinate row(x) or column(y) of the mouse on the current mouseIsland
public int getMousePosition(int x, int y){
return mousePosition[x][y];
}
// loadIsland
// Populates any information needed to run the simulation for the current mouseIsland
public void loadIsland() throws Exception{
if (islandTxt == "" || islandTxt == null){
System.out.println("loadIsland() failed! 'islandTxt' variable is empty!");
return;
}
findIslandRow();
findIslandCol();
setCharIslandArray();
findIslandVariables();
}
// printIslandStats
// Prints to the console the statistics for this mouseIsland at its current state
public void printIslandStats(){
System.out.println("Run count: " + runCount + " times\n"
+ "Drowned: " + mouseDrowned + " times\n"
+ "Starved: " + mouseStarved + " times\n"
+ "Escaped: " + mouseEscaped + " times \n");
}
// maxValue
// This function returns the max value of an integer array.
public int maxValue(int [] inArray){
int value = 0;
for (int i=0;i<inArray.length;i++)
if (value<inArray[i]) value = inArray[i];
return value;
}
// findIslandRow
// Counts the number of rows for the current mouseIsland
public void findIslandRow() throws Exception {
Scanner input = new Scanner(new File(islandTxt));
islandRows = 0;
while(input.hasNext()){
input.nextLine();
islandRows++;
}
//System.out.println("Rows: "+islandRows);
input.close();
}
// findIslandCol
// Counts and stores the number of columns for each row in the current mouseIsland
public void findIslandCol() throws Exception {
Scanner input = new Scanner(new File(islandTxt));
String inputLine = ""; int row = 0; islandCols = new int [islandRows];
while(input.hasNext()){
inputLine = input.nextLine();
islandCols[row] = inputLine.length();
//System.out.println("Col"+row+": "+islandCols[row]);
row++;
}
input.close();
}
// loads a mouse island map into a 2 dimensional character array
public void setCharIslandArray() throws Exception {
Scanner input = new Scanner(new File(islandTxt));
islandCharArray = new char [islandRows+1][maxValue(islandCols)+1];
String islandRow ="";
for(int row=0;row<islandRows;row++){
islandRow = input.nextLine();
for (int col=0;col<islandRow.length();col++) {
islandCharArray[row][col] = islandRow.charAt(col);
}
}
input.close();
}
// drawCharIsland
// Draws a character array to the console for testing
public void drawCharIsland() throws Exception{
String ln = "";
for (int row= 0;row<islandRows;row++){
for (int col= 0;col<islandCols[row];col++){
if (col == islandCols[row]-1) ln = "\n"; else ln ="";
System.out.print(islandCharArray[row][col]+ln);
}
}
System.out.println("");
}
// drawIntIsland
// Draws an integer array to the console for testing
public void drawIntIsland() throws Exception{
String ln = "";
for (int row= 0;row<islandRows;row++){
for (int col= 0;col<islandCols[row];col++){
if (col == islandCols[row]-1) ln = "\n"; else ln ="";
System.out.print(islandIntArray[row][col]+ln);
}
}
System.out.println("");
}
// drawBigIntIsland
// Draws an integer array with special formatting for larger numbers the console for testing
public void drawBigIntIsland() throws Exception{
String ln = ""; String rowZero = ""; String colZero = "";
int i=0;
for (int row= 0;row<islandRows;row++){
if (row <= 9) rowZero = " "; else rowZero ="";
for (int col= 0;col<islandCols[row];col++){
if (row == 0)
while (i<islandRows){
if (i == 0) System.out.print("XY");
if (i <= 9) colZero = " "; else colZero ="";
if (i == islandCols[row]-1) ln = "\n"; else ln ="";
System.out.print(colZero+i+ln);
i++;
}
if (col == islandCols[row]-1) ln = "\n"; else ln ="";
if (islandIntArray[row][col] <= 9) colZero = "|"; else colZero ="";
if (col == 0) System.out.print(rowZero+row);
if (row >=0 && col >=0) System.out.print(colZero+islandIntArray[row][col]+ln);
}
}
}
// findIslandVariables
// finds and stores all of the mouseIsland object variables
public void findIslandVariables() throws Exception{
int bCount = 0;
mousePosition = new int [2][2]; bridgePosition = new int [200][2];
for (int row= 0;row<islandRows;row++){
for (int col= 0;col<islandCols[row];col++){
//System.out.println(row+"|"+col);
switch(islandCharArray[row][col]) {
case 'X' : mousePosition[0][0] = row; mousePosition[0][1] = col; //current position
mousePosition[1][0] = row; mousePosition[1][1] = col; //start position
//System.out.println("Mouse found on: "+row+"|"+col);
break;
case '-' :
if (row == 0 || col == 0 || row == islandRows-1 || col == islandCols[row]-1){
bridgePosition[bCount][0] = row; bridgePosition[bCount][1] = col;
bCount++;
//System.out.println("Bridge"+bCount+": "+row+"|"+col);
} else if (col>=islandCols[row-1]-1 || col>=islandCols[row+1]-1){
bridgePosition[bCount][0] = row; bridgePosition[bCount][1] = col;
//System.out.println("Bridge found: "+row+"|"+col);
bCount++;
}
break;
}
}
}
}
// moveMouse
// Computes the movement for the mouse
// set moveDebug to 'true' to display the mouse's moves
public void moveMouse(){
moveDebug = false;
int mouseMove = (int)(Math.random() * 4);
switch(mouseMove){
case 0: mousePosition[0][0]--; if (moveDebug == true) System.out.print("Move: "+mouseMove+"[UP] "); break;
case 1: mousePosition[0][0]++; if (moveDebug == true) System.out.print("Move: "+mouseMove+"[DOWN] "); break;
case 2: mousePosition[0][1]--; if (moveDebug == true) System.out.print("Move: "+mouseMove+"[LEFT] "); break;
case 3: mousePosition[0][1]++; if (moveDebug == true) System.out.print("Move: "+mouseMove+"[RIGHT] "); break;
}
if (moveDebug == true) System.out.println(" Location:|"+mousePosition[0][0]+"|"+mousePosition[0][1]+"|");
}
// runMouseIsland
// Displays the outcome of one trial of the current mouseIsland
public void runMouseIsland() throws Exception{
islandIntArray = new int [islandRows][maxValue(islandCols)];
mousePosition[0][0] = mousePosition [1][0]; mousePosition[0][1] = mousePosition [1][1];
for (int count=0;count<100;count++){
moveMouse();
if (mousePosition[0][0] == bridgePosition[0][0] && mousePosition[0][1] == bridgePosition[0][1] || mousePosition[0][0] == bridgePosition[1][0] && mousePosition[0][1] == bridgePosition[1][1] ){
System.out.println("The mouse has escaped using the bridge at: "+mousePosition[0][0]+"|"+mousePosition[0][1]);
islandIntArray[mousePosition[0][0]][mousePosition[0][1]]++;
mouseEscaped++;
break;
} else
if (islandCharArray[mousePosition[0][0]][mousePosition[0][1]] == '#') {
System.out.println("OUCH! The Mouse fell into the water and died at: "+mousePosition[0][0]+"|"+mousePosition[0][1]);
islandIntArray[mousePosition[0][0]][mousePosition[0][1]]++;
mouseDrowned++;
break;
}
islandIntArray[mousePosition[0][0]][mousePosition[0][1]]++;
if (count == 99){
System.out.println("The mouse withered away (died) at: "+mousePosition[0][0]+"|"+mousePosition[0][1]);
mouseStarved++;
}
}
drawIntIsland();
runCount++;
}
}