2048——Java控制台版本

import java.util.Random;
import java.util.Scanner;
/**
 * 
 * @author 老师付 2021年5月29日15:05:21
 */
public class Action {
  static Random random = new Random();
  static Scanner scanner = new Scanner(System.in);
  private static boolean isNotFull(int[][] board) {
    for (int[] ia : board)
      for (int i : ia)
        if (i == 0)
          return true;
    return false;
  }
  private static void generate(int[][] board) {
    assert isNotFull(board);
    while (true) {
      int number = random.nextInt(16);
      int row = number / 4;
      int col = number % 4;
      if (board[row][col] == 0) {
        board[row][col] = System.currentTimeMillis() % 2 == 0 ? 2 : 4;
        break;
      }
    }
  }
  static int[][] init() {
    int[][] numArray = new int[4][4];
    generate(numArray);
    generate(numArray);
    return numArray;
  }
  static void showBoard(int[][] board) {
    for (int[] numArray : board) {
      for (int i : numArray) {
        if (i == 0) {
          System.out.printf("%4s", ".");
        } else {
          System.out.printf("%4s", i);
        }
      }
      System.out.println();
    }
  }
  static char acceptInput() {
    while (true) {
      String line = scanner.nextLine().toLowerCase();
      char direction = line.charAt(0);
      if ("wasdWASD".indexOf(direction) != -1) {
        return direction;
      }else {
        System.out.println("请按要求输入操作指令:");
        System.out.println("up:w/W");
        System.out.println("left:a/A");
        System.out.println("down:s/S");
        System.out.println("right:d/D");
      }
    }
  }
  static void downBlock(int[][] numArray) {
    for (int i = 0; i < 4; i++) {
      for (int k = 0; k < 3; k++) {
        for (int j = 3; j > 0; j--) {
          if (numArray[j][i] == 0) {
            numArray[j][i] = numArray[j - 1][i];
            numArray[j - 1][i] = 0;
          }
        }
        for (int j = 3; j > 0; j--) {
          if (numArray[j][i] == numArray[j - 1][i]) {
            numArray[j][i] = 2 * numArray[j][i];
            numArray[j - 1][i] = 0;
          }
        }
      }
    }
    generate(numArray);
  }
  static void upBlock(int[][] numArray) {
    for (int i = 0; i < 4; i++) {
      for (int k = 0; k < 3; k++) {
        for (int j = 0; j < 3; j++) {
          if (numArray[j][i] == 0) {
            numArray[j][i] = numArray[j + 1][i];
            numArray[j + 1][i] = 0;
          }
        }
        for (int j = 0; j < 3; j++) {
          if (numArray[j][i] == numArray[j + 1][i]) {
            numArray[j][i] = 2 * numArray[j][i];
            numArray[j + 1][i] = 0;
          }
        }
      }
    }
    generate(numArray);
  }
  static void leftBlock(int[][] numArray) {
    for (int i = 0; i < 4; i++) {
      for (int k = 0; k < 3; k++) {
        for (int j = 0; j < 3; j++) {
          if (numArray[i][j] == 0) {
            numArray[i][j] = numArray[i][j + 1];
            numArray[i][j + 1] = 0;
          }
        }
        for (int j = 0; j < 3; j++) {
          if (numArray[i][j] == numArray[i][j + 1]) {
            numArray[i][j] = 2 * numArray[i][j];
            numArray[i][j + 1] = 0;
          }
        }
      }
    }
    generate(numArray);
  }
  static void rightBlock(int[][] numArray) {
    for (int i = 0; i < 4; i++) {
      for (int k = 0; k < 3; k++) {
        for (int j = 3; j > 0; j--) {
          if (numArray[i][j] == 0) {
            numArray[i][j] = numArray[i][j - 1];
            numArray[i][j - 1] = 0;
          }
        }
        for (int j = 3; j > 0; j--) {
          if (numArray[i][j] == numArray[i][j - 1]) {
            numArray[i][j] = 2 * numArray[i][j];
            numArray[i][j - 1] = 0;
          }
        }
      }
    }
    generate(numArray);
  }
  static void process(int[][] board, char direction) {
    switch (direction) {
    case 'w':
      upBlock(board);
      break;
    case 'a':
      leftBlock(board);
      break;
    case 's':
      downBlock(board);
      break;
    case 'd':
      rightBlock(board);
      break;
    }
  }
  public static void main(String[] args) {
    System.out.println("游戏开始：请按照操作提示游戏：");
    System.out.println("up:w/W");
    System.out.println("left:a/A");
    System.out.println("down:s/S");
    System.out.println("right:d/D");
    int[][] board = init();
    while (true) {
      showBoard(board);
      char direction = acceptInput();
      process(board, direction);
    }
  }
}