draw diamond shape in java code example

Example 1: pygame for loop for draw shape

import pygame 
from pygame.locals import *
from sys import exit
from random import *

pygame.init()

screen = pygame.display.set_mode((640, 480), 0,32)

class Rectangle:
    def __init__(self, pos, color, size):
        self.pos = pos
        self.color = color
        self.size = size
    def draw(self):
        pygame.draw.rect(screen, self.color, Rect(self.pos, self.size))

rectangles = []     

for count in range(10):
    random_color = (randint(0,255), randint(0,255), randint(0,255))
    random_pos = (randint(0,639), randint(0,479))
    random_size = (639-randint(random_pos[0], 639), 479-randint(random_pos[1],479))

    rectangles.append(Rectangle(random_pos, random_color, random_size))



while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            exit()
    screen.lock()
    for rectangle in rectangles:
        rectangle.draw()
    screen.unlock()
    pygame.display.update()

Example 2: how to create a draw Rectangle in java

import javax.swing.JFrame;
import java.awt.Rectangle;
import javax.swing.JComponent;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.Color;

public class ChrismasTree {
    public static void main(String[] args) {
        JFrame window = new JFrame();
        window.setTitle("Christmas Tree");
        window.setSize(800, 1000);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setVisible(true);
        DrawingComponent DC = new DrawingComponent();
        window.add(DC);
    }
}

class DrawingComponent extends JComponent{
    public void paint(Graphics graph0){
        Graphics2D graph = (Graphics2D) graph0;

        graph.setColor(Color.LIGHT_GRAY);
        graph.draw(new Rectangle(0, 710, 70, 60));

        graph.setColor(Color.BLUE);
        graph.draw(new Rectangle(70, 600, 50, 100));

        graph.setColor(Color.BLACK);
    }
}