1. עקרנות תכנות מונחה עצמים
תרגול GUI

2. סיכום ביניים GUI: Swing Basic components Event handling Containers
Layouts

3. Outline
Game of Life
Painting

4. Case Study
Game of Life

5. Conway’s Game of Life

6. Basic Rules Each cell in the grid is either live or dead
The user determines the initial positions of all live cells.
The game proceeds in rounds. In each round some new organisms born, and others die, according to predefined evolution rules.

7. Neighbors
The neighbors of a cell are the cells that surround it.

8. Neighbors
The neighbors of a cell are the cells that surround it.

9. Evolution Rules
Any live cell with fewer than two live neighbors dies, as if caused by under-population.
Any live cell with two or three live neighbors lives on to the next generation.
Any live cell with more than three live neighbors dies as if by overcrowding.
Any dead cell with exactly three live neighbors becomes a live cell, as if by reproduction

10. Program clasess
Game – Main class that creates the graphical user interface.
Board – A class that represents the game board.
Holds an array of integers and an array of buttons
ButtonPressed – An ActionListener for setting the initial position
MODEL
VIEW

11. Game Class

12. Board Class

13. public void next ( ) {
int [ ] [ ] lastState = new int [N+2] [N+2] ;
for(int i = 1 ; i <= N ; i++){ // copy current state to new array.
for ( int j =1 ; j <= N ; j++){
lastState [i][j] = array[i-1][j-1]; }
} // top and buttom row (i = 0,N+1), left and right culomn(j= 0,N+1) initiate to 0
for ( int i = 0 ; i < N ; i++){ // update current state.
for(int j < 1; j <= N ; j++ ){
int count = 0;
count = countNeighbors(lastState,i+1,j+1);
if(count < 2 || count > 3 ){ //check for under-population or overcrowding
killCell(i,j);
if(count == 3) { // check for reproduction
reviveCell(i,j);
private int countNeighbors(int[][] lastState,int x, int y){
int count = lastState[x-1][y-1] + lastState[x-1][y]+lastState[x-1][y+1] // all 3 neighbors left to current cell
+ lastState[x][y-1] + lastState[x][y+1] // the cell above current and the cell below
+ lastState[x+1][y-1] + lastState[x+1][y]+lastState[x+1][y+1] ; // all 3 neighbors left to current cell
return count;
private void killCell( int i , int j ){
array[i][j] = 0;
buttons[i][j].setIcon( null );
private void reviveCell( int i , int j ){
array[i][j] = 1;
buttons[i][j].setIcon(new ImageIcon( “button.gif” ));
}//end of Board class

14. ButtonPressed Class