我正在尝试用Java制作一个战舰游戏，我在那里放入船只的坐标，然后对手（计算机）放入他们的坐标。然后，两个玩家都进入行/列以选择地图上的一个点。但随后，它崩溃了。
这是代码。
import java.util.Random;
import java.util.Scanner;
public class battleShip {
public static void main(String[] args) {
int[][] board = new int[5][5];
int[][] ships = new int[5][5];
int[] shoot = new int[5];
int[] shoot2 = new int[4];
int attempts=0,
shotHit=0;
initBoard(board);
initBoard2(board);
initShips(ships);
System.out.println();
do{
showBoard(board);
showBoard2(board);
shoot(shoot);
shoot2(shoot2);
attempts++;
if(hit(shoot,ships)){
hint(shoot,ships,attempts);
shotHit++;
}
if(hit2(shoot2,ships)){
hint2(shoot2,ships,attempts);
shotHit++;
}
else
hint(shoot,ships,attempts);
hint2(shoot2,ships,attempts);
changeboard(shoot,ships,board);
changeboard2(shoot2,ships,board);
}while(shotHit!=4);
System.out.println("\n\n\nBattleship Java game finished! You hit 4 ships in "+attempts+" attempts");
showBoard(board);
showBoard2(board);
}
public static void initBoard(int[][] board){
for(int row=0 ; row < 5 ; row++ )
for(int column=0 ; column < 5 ; column++ )
board[row][column]=-1;
}
public static void initBoard2(int[][] board){
for(int row2=0 ; row2 < 5 ; row2++ )
for(int column2=0 ; column2 < 5 ; column2++ )
board[row2][column2]=-1;
}
public static void showBoard(int[][] board){
System.out.println("\t1 \t2 \t3 \t4 \t5");
System.out.println();
for(int row=0 ; row < 5 ; row++ ){
System.out.print((row+1)+"");
for(int column=0 ; column < 5 ; column++ ){
if(board[row][column]==-1||board[row][column]==-1||board[row][column]==-3){
System.out.print("\t"+"~");
}else if(board[row][column]==0){
System.out.print("\t"+"*");
}else if(board[row][column]==1){
System.out.print("\t"+"X");
}
}
System.out.println();
}
}
public static void showBoard2(int[][] board){
System.out.println("\t1 \t2 \t3 \t4 \t5");
System.out.println();
for(int row2=0 ; row2 < 5 ; row2++ ){
System.out.print((row2+1)+"");
for(int column2=0 ; column2 < 5 ; column2++ ){
if(board[row2][column2]==-1||board[row2][column2]==-1||board[row2][column2]==-3){
System.out.print("\t"+"~");
}else if(board[row2][column2]==0){
System.out.print("\t"+"*");
}else if(board[row2][column2]==1){
System.out.print("\t"+"X");
}
}
System.out.println();
}
}
public static void initShips(int[][] ships){
Random random = new Random();
Scanner input = new Scanner(System.in);
for(int ship=0 ; ship < 4 ; ship++){
ships[ship][0]=input.nextInt();
ships[ship][1]=input.nextInt();
ships[ship][2]=random.nextInt(4);
ships[ship][3]=random.nextInt(4);
//let's check if that shot was already tried
//if it was, just finish the do...while when a new pair was randomly selected
for(int last=0 ; last < ship ; last++){
if( (ships[ship][0] == ships[last][0])&&(ships[ship][1] == ships[last][1])&&(ships[ship][2] == ships[last][2])&&(ships[ship][3] == ships[last][3]) )
do{
ships[ship][2]=random.nextInt(4);
ships[ship][3]=random.nextInt(4);
}while( (ships[ship][0] == ships[last][0])&&(ships[ship][1] == ships[last][1])&& (ships[ship][2] == ships[last][2])&&(ships[ship][3] == ships[last][3]) );
}
}
}
public static void shoot(int[] shoot){
Random random = new Random();
Scanner input = new Scanner(System.in);
System.out.print("Row: ");
shoot[0] = input.nextInt();
shoot[0]--;
System.out.print("Column: ");
shoot[1] = input.nextInt();
shoot[1]--;
}
public static void shoot2(int[] shoot2){
Random random = new Random();
Scanner input = new Scanner(System.in);
System.out.print("Computer turn: ");
shoot2[2] = random.nextInt(5);
shoot2[2]--;
shoot2[3] = random.nextInt(5);
shoot2[3]--;
}
public static boolean hit(int[] shoot, int[][] ships){
for(int ship=0 ; ship<ships.length ; ship++){
if( shoot[0]==ships[ship][0] && shoot[1]==ships[ship][1]){
System.out.printf("You hit a ship located in (%d,%d)\n",shoot[0]+1,shoot[1]+1);
return true;
}
}
return false;
}
public static boolean hit2(int[] shoot2, int[][] ships){
for(int ship=0 ; ship<ships.length ; ship++){
if( shoot2[2]==ships[ship][2] && shoot2[3]==ships[ship][3]){
System.out.printf("Computer hit a ship located in (%d,%d)\n",shoot2[2]+1,shoot2[3]+1);
return true;
}
}
return false;
}
public static void hint(int[] shoot, int[][] ships, int attempt){
int row=0,
column=0;
for(int line=0 ; line < ships.length ; line++){
if(ships[line][0]==shoot[0])
row++;
if(ships[line][1]==shoot[1])
column++;
}
System.out.printf("\nHint %d: \nRow %d -> %d ships\n" +
"Column %d -> %d ships\n",attempt,shoot[0]+1,row,shoot[1]+1,column);
}
public static void hint2(int[] shoot2, int[][] ships, int attempt){
int row2=0,
column2=0;
for(int line=0 ; line < ships.length ; line++){
if(ships[line][2]==shoot2[2])
row2++;
if(ships[line][3]==shoot2[3])
column2++;
}
System.out.printf("\nHint %d: \nRow %d -> %d ships\n" +
"Column %d -> %d ships\n",attempt,shoot2[2]+1,row2,shoot2[3]+1,column2);
}
public static void changeboard(int[] shoot, int[][] ships, int[][] board){
if(hit(shoot,ships))
board[shoot[0]][shoot[1]]=1;
else
board[shoot[0]][shoot[1]]=0;
}
public static void changeboard2(int[] shoot2, int[][] ships, int[][] board){
if(hit2(shoot2,ships))
board[shoot2[2]][shoot2[3]]=1;
else
board[shoot2[2]][shoot2[3]]=0;
}
}
当我在CMD中运行它时会发生这种情况。
C:\Users\Me\Desktop\Battleship>javac battleShip.java
C:\Users\Me\Desktop\Battleship>java battleShip
1
2
3
4
5
1
2
3
1 2 3 4 5
1 ~ ~ ~ ~ ~
2 ~ ~ ~ ~ ~
3 ~ ~ ~ ~ ~
4 ~ ~ ~ ~ ~
5 ~ ~ ~ ~ ~
1 2 3 4 5
1 ~ ~ ~ ~ ~
2 ~ ~ ~ ~ ~
3 ~ ~ ~ ~ ~
4 ~ ~ ~ ~ ~
5 ~ ~ ~ ~ ~
Row: 2
Column: 3
Computer turn: You hit a ship located in (2,3)
Hint 1:
Row 2 -> 1 ships
Column 3 -> 1 ships
Hint 1:
Row 2 -> 1 ships
Column 3 -> 1 ships
Hint 1:
Row 4 -> 1 ships
Column 0 -> 0 ships
You hit a ship located in (2,3)
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at battleShip.changeboard2(battleShip.java:216)
at battleShip.main(battleShip.java:41)
Issue occurs when person selects column or row 0
我真的很感激帮助:(
答案 0 :(得分：0)
public int nextInt(int n)
返回伪随机，均匀分布的int值介于0（包括）和指定值（不包括）
之间public static void shoot2(int[] shoot2){
Random random = new Random(System.currentTimeMillis());
System.out.print("Computer turn: ");
shoot2[2] = random.nextInt(5);
shoot2[3] = random.nextInt(5);
}