GameOfLifeAssignment/src/Life.java

import java.util.Arrays;

public class Life implements ILife {


  Life nextworld;
  String[] board;


  public static void main(String[] args) {
    Life l = new Life(new String[]{"     ",
            "     ",
            " *** ",
            "     ",
            "     "});
    l = (Life) l.nextGeneration();

  }

  public Life() {
    nukeAll();
  }

  public Life(String[] setup) {
    this();
    for (int y = 0; y < setup.length; y++)
      for (int x = 0; x < setup[y].length(); x++)
        if (setup[y].charAt(x) != ' ')
          setAlive(x, y);
  }


  @Override
  public void nukeAll() {
    // TODO Auto-generated method stub
    board = new String[]{"     ",
            "     ",
            "     ",
            "     ",
            "     "};
  }

  @Override
  public void setAlive(int x, int y) {
    // TODO Auto-generated method stub
    String line = "";
    for (int i = 0; i < board[y].length(); i++) {
      if (i == x)
        line += '*';
      else
        line += board[y].charAt(i);
    }
    board[y] = line;


  }

  @Override
  public void setDead(int x, int y) {
    // TODO Auto-generated method stub
    String line = "";
    for (int i = 0; i < board[y].length(); i++) {
      if (i == x)
        line += ' ';
      else
        line += board[y].charAt(i);
    }
    board[y] = line;


  }

  @Override
  public boolean isAlive(int x, int y) {
    // TODO Auto-generated method stub
    if (board[y].charAt(x) == '*')
      return true;
    else
      return false;
  }

  @Override
  public ILife nextGeneration() {
    // TODO Auto-generated method stub
    Life nextWorld = new Life();
    for (int y = 0; y < board.length; y++) {
      for (int x = 0; x < board[y].length(); x++) {
        int neighbourCells = CountNeighbourCells(x, y);
        if (isAlive(x, y))
          if (neighbourCells == 3 || neighbourCells == 2)
            nextWorld.setAlive(x, y);
          if (neighbourCells < 2 || neighbourCells > 3)
            nextWorld.setDead(x, y);
        if (!isAlive(x, y))
          if (neighbourCells == 3)
            nextWorld.setAlive(x, y);
          else
            nextWorld.setDead(x, y);
        }
      }
    nextWorld.drawWorld();
    return nextWorld;
  }

  public int CountNeighbourCells(int x, int y) {
    int pre_y = y - 1;
    int pre_x = x - 1;
    int after_y = y + 1;
    int after_x = x + 1;
    int counter = 0;
    //UpperSide
    if (pre_y >= 0) {
      for (int i = pre_x; i <= after_x; i++) {
        if (i >= 0 && i < board[pre_y].length()&& isAlive(i,pre_y)){
            counter++;
        }
      }
    }
    //DownSide
    if (after_y < board.length) {
      for (int i = pre_x; i <= after_x; i++) {
        if (i >= 0 && i < board[after_y].length()&&isAlive(i,after_y)) {
            counter++;
        }
      }
    }
    //leftSide
    if (pre_x >= 0&& isAlive(pre_x,y)) {
        counter++;
    }

    //rightSide
    if (after_x < board[y].length()&&isAlive(after_x,y)) {
        counter++;
      }
    return counter;
  }


  public void drawWorld() {
    for (int i = 0; i < board.length; i++) {
      System.out.println(Arrays.toString(new String[]{
              board[i]
      }));

    }
  }
}