面试题：常见的多线程实战手撕代码（顺序打印数字、字母）

private static char c = 'A'; private static int i = 0; public static void main(String[] args) {             Runnable runnable = new Runnable() {            public void run() {               synchronized (this) {//加锁                 try {                     int threadId = Integer.parseInt(Thread.currentThread().getName());                     while (i < 26) {                          if (i % 3 == threadId - 1) {                              System.out.println(threadId +""+ (char) c++);                              i++;                              notifyAll();// 唤醒处于等待状态的线程                          } else {                              wait();// 释放当前锁并进入等待状态                          }                     }                 } catch (InterruptedException e) {                     e.printStackTrace();                 }               }//执行结束释放当前锁            }         };         Thread t1 = new Thread(runnable, "1");                  t1.start();         t2.start();         t3.start(); }