OMGZui

// A
if ($result == 200) {
    return true;
}
return false;

// B
return $result == 200 ? true : false;

OMGZui

class SyncThread implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "_Sync: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
        synchronized (new SyncThread()) {
            try {
                System.out.println(Thread.currentThread().getName() + "_Sync_Start: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                Thread.sleep(2000);
                System.out.println(Thread.currentThread().getName() + "_Sync_End: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));

OMGZui

F_thread4_Sync: 23:13:06
F_thread2_Sync: 23:13:06
F_thread3_Sync: 23:13:06
F_thread4_Sync_Start: 23:13:06
F_thread1_Sync: 23:13:06
F_thread3_Sync_Start: 23:13:06
F_thread2_Sync_Start: 23:13:06
F_thread1_Sync_Start: 23:13:06
F_thread2_Sync_End: 23:13:08
F_thread3_Sync_End: 23:13:08

OMGZui

class SyncThread implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "_Sync: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
        synchronized (SyncThread.class) {
            try {
                System.out.println(Thread.currentThread().getName() + "_Sync_Start: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                Thread.sleep(2000);
                System.out.println(Thread.currentThread().getName() + "_Sync_End: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));

OMGZui

public class medium01Test{

    public static void main(String[] args) {
        SyncThread syncThread = new SyncThread();
        Thread F_thread1 = new Thread(new SyncThread(), "F_thread1");
        Thread F_thread2 = new Thread(new SyncThread(), "F_thread2");
        Thread F_thread3 = new Thread(syncThread, "F_thread3");
        Thread F_thread4 = new Thread(syncThread, "F_thread4");
        F_thread1.start();
        F_thread2.start();

OMGZui

public class medium01Test{

    public static void main(String[] args) {
        SyncThread syncThread = new SyncThread();
        Thread F_thread1 = new Thread(new SyncThread(), "F_thread1");
        Thread F_thread2 = new Thread(new SyncThread(), "F_thread2");
        Thread F_thread3 = new Thread(syncThread, "F_thread3");
        Thread F_thread4 = new Thread(syncThread, "F_thread4");
        F_thread1.start();
        F_thread2.start();

OMGZui

class SyncThread implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "_Sync: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
        synchronized (this) {
            try {
                System.out.println(Thread.currentThread().getName() + "_Sync_Start: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                Thread.sleep(2000);
                System.out.println(Thread.currentThread().getName() + "_Sync_End: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));

OMGZui

class SyncThread implements Runnable {

    @Override
    public void run() {
        sync();
    }
    public synchronized void sync() {
        System.out.println(Thread.currentThread().getName() + "_Sync: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
        try {
            System.out.println(Thread.currentThread().getName() + "_Sync_Start: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));

OMGZui

class SyncThread implements Runnable {

    @Override
    public void run() {
        sync();
    }
    public synchronized static void sync() {
        System.out.println(Thread.currentThread().getName() + "_Sync: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
        try {
            System.out.println(Thread.currentThread().getName() + "_Sync_Start: " + new SimpleDateFormat("HH:mm:ss").format(new Date()));

OMGZui

// about page
import React from 'react';
export default () => {
  console.log('this is about page');
  return <>
    <table border="1">
      <tr>
        <th>Month</th>
        <th>Savings</th>
      </tr>