exercise5_25.java

Introduction to java programming 一书中所有编程练习部分的源码

public class Exercise5_25 {
    public static void main(String[] args) {
        int[][] board = new int[8][8];
        
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[0].length; j++) {
                board[i][j] = (int)(Math.random() * 2);
                System.out.print(board[i][j]);
            }
            
            System.out.println();
        }
        
        // Check rows
        for (int i = 0; i < board.length; i++) {
            boolean same = true;
            for (int j = 1; j < board[0].length; j++) {
                if (board[i][0] != board[i][j]) { same = false; break; }
            }
            if (same) System.out.println("All " + board[i][0] + "'s on row " + i);
        }
        
        // Check columns
        for (int j = 0; j < board[0].length; j++) {
            boolean same = true;
            for (int i = 1; i < board.length; i++) {
                if (board[0][j] != board[i][j]) { same = false; break; }
                
            }
        if (same) System.out.println("All " + board[0][j] + "'s on column " + j);
        }
        
        // Check major diagonal
        boolean same = true;
        for (int i = 1; i < board.length; i++) {
            if (board[0][0] == board[i][i]) { same = false; break; }   
        }
         if (same) System.out.println("All " + board[0][0] + "'s on major diagonal");
        
        // Check subdiagonal
        same = true;
        for (int i = 1; i < board.length; i++) {
            if (board[0][7] == board[i][7-i]) { same = false; break; }
        }
        if (same) System.out.println("All " + board[0][0] + "'s on subdiagonal");
    }
}