[JavaSE] multithreading (ticket sales example), javase ticket sales

[JavaSE] multithreading (ticket sales example), javase ticket sales

Requirement: simple ticket buying program, ticket selling in multiple windows, multi-thread

 

Define a class Ticket to implement the Runnable interface,

Defines the number of digits of the int type in the member attribute nums.

Implement the run () method, in the run Method

While (true) infinite loop, print nums --

 

Get Ticket object, new

Get the Thread () object, new, and construct the parameter: Runable object

Call the start () method of the Thread object to enable the Thread.

 

In this case, thread security issues occur. Use the synchronized synchronization code block to solve security problems.

 

Avoid deadlock. nested synchronization in synchronization, but different locks

class Ticket implements Runnable {    private int nums = 100;    @Override    public void run() {        while (true) {            synchronized (this) {                if (nums > 0) {                    try {                        Thread.sleep(10);                    } catch (Exception e) {                        e.printStackTrace();                    }                    System.out.println(Thread.currentThread().getName() + "==="                            + (nums--));                }else{                    break;                }            }        }    }}public class TicketDemo {    /**     * @param args     */    public static void main(String[] args) {        Ticket ticket = new Ticket();        new Thread(ticket).start();        new Thread(ticket).start();        new Thread(ticket).start();        new Thread(ticket).start();    }}