vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

Ray1988

/*
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.

For example, given n = 3, a solution set is:

"((()))", "(()())", "(())()", "()(())", "()()()"
*/

public class Solution {

mugli

#!/bin/bash

sudo apt-get install -y python-software-properties
sudo add-apt-repository -y ppa:webupd8team/java
sudo apt-get update

# Enable silent install
echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections
echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections

jewelsea

package login;

import javafx.event.*;
import javafx.fxml.FXML;
import javafx.scene.control.*;

/** Controls the login screen */
public class LoginController {
  @FXML private TextField user;
  @FXML private TextField password;

avilches

import java.security.*;
public class Sha {
    public static String hash256(String data) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(data.getBytes());
        return bytesToHex(md.digest());
    }
    public static String bytesToHex(byte[] bytes) {
        StringBuffer result = new StringBuffer();
        for (byte byt : bytes) result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(1));