Simple Java applictaion which draws pyramids in the console.

PyramidDrawing.java

package ge.tsu.pyramid;

public class Main {

	public static void main(String[] args) {

		// Pyramid properties
		char symbol = '+';
		int height = 10;

		PyramidPrinter printer = new PyramidPrinter();

		// Left pyramid
		System.out.println(printer.getLeftPyramidOfHeight(height, symbol));

		// Right pyramid
		System.out.println(printer.getRightPyramidOfHeight(height, symbol));

		// Center pyramid
		System.out.println(printer.getCenterPyramidOfHeight(height, symbol));
	}

	static class PyramidPrinter {

		String getLeftPyramidOfHeight(int height, char symbol) {

			String str = "";
			for (int i = 0; i < height; i++) {
				for (int j = 0; j <= i; j++) {
					str += symbol;
				}
				str += "\n";
			}
			return str;
		}

		String getRightPyramidOfHeight(int height, char symbol) {

			String str = "";
			for (int i = 0; i < height; i++) {
				for (int j = height; j >= 0; j--) {
					if (j <= i) {
						str += symbol;
					} else {
						str += " "; // Empty space
					}
				}
				str += "\n";
			}
			return str;
		}

		String getCenterPyramidOfHeight(int height, char symbol) {

			int width = 2 * height - 1;
			String str = "";
			for (int i = 0; i < height; i++) {
				for (int j = 0; j < width; j++) {
					int center = width / 2;
					if (j >= center - i && j <= center + i) {
						str += symbol;
					} else {
						str += " ";
					}
				}
				str += "\n";
			}
			return str;
		}
	}

}