A Very Simple Game Of Life Implementation for Java

SimpleGOL.java

public class SimpleGOL {
	
	private static final int HEIGHT = 80;
	private static final int CLEAR_SPACE = 2;

	public static void main(String[] args) throws InterruptedException {
		boolean [][] matrix = new boolean[HEIGHT][HEIGHT];
		boolean [][] tempMatrix = new boolean[HEIGHT][HEIGHT];
		
		for(int i = 0; i < matrix.length; i++)
			for(int j = 0; j < matrix[i].length; j++) {
				matrix[i][j] = false;
				tempMatrix[i][j] = false;
			}
		
		generateRandom(matrix);
		
		while(true) {
			Thread.sleep(120);
			printMatrix(matrix);
			processLife(matrix, tempMatrix);
			clear();
			System.out.println("-----------------------------------------------------");
		}
	}
	
	private static void processLife(boolean[][] matrix, boolean[][] tempMatrix) {
		copyMatrix(matrix, tempMatrix);
		
		for(int i = 0; i < HEIGHT; i++) {
			for(int j = 0; j < HEIGHT; j++) {
				
				int countAlive = 0;
				for(int k = i-1; k <= i+1; k++) {
					for(int t = j-1; t <= j+1; t++) {
						if(t < 0 || t >= HEIGHT || k < 0 || k >= HEIGHT)
							continue;
						else {
							if(matrix[k][t]) {
								countAlive++;
							}
						}
					}
				}
				
				if(matrix[i][j])
					countAlive--; // decrement for self
				
				if(matrix[i][j]) {
					if(countAlive > 3 || countAlive < 2) {
						tempMatrix[i][j] = false;
					}
				} else if(countAlive == 3) {
						tempMatrix[i][j] = true;
				}
				
			}
		}
		
		copyMatrix(tempMatrix, matrix);
	}
	
	private static void copyMatrix(boolean[][] src, boolean[][] dst) {
		for(int i = 0; i < HEIGHT; i++)
			System.arraycopy(src[i], 0, dst[i], 0, HEIGHT);
	}
	
	private static void printMatrix(boolean[][] matrix) {
		for(int i = 0; i < matrix.length; i++) {
			for(int j = 0; j < matrix[i].length; j++) {
				if(matrix[i][j] == true) {
					System.out.print('X');
				} else {
					System.out.print(' ');
				}

			}
			System.out.println();
		}
	}
	
	private static void clear() {
		for(int i = 0; i < CLEAR_SPACE; i++)
			System.out.println();
	}
	
	private static void generateRandom(boolean[][] matrix) {
		for(int i = 0; i < HEIGHT; i++)
			for(int j = 0; j < HEIGHT; j++)
				matrix[i][j] = Math.random() < 0.5;
	}

}