数据库的一致性读，赃读，多线程与赃读，ACID，UNDO

时间：2022-03-16 11:29

赃读

对于对象额同步异步方法，我们在设计自己的程序的时候，一定要考虑的问题整体，不然会出现数据不一致的错误，很经典的就是赃读（dityread）

示例：

package com.nbkj.thread;

public class DityRead {
    private String username = "hsj179540";
    private String password = "123";

    public synchronized void setValue(String username, String password) {
        this.username = username;
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        this.password = password;
        System.out.println("setValue的最终结果是:username:" + this.username + ",password:" + this.password);
    }
    
    /*synchronized */
    public synchronized void getVlaue() {
        System.out.println("getValue的最终结果是:username:" + this.username + ",password:" + this.password);
    }

    public static void main(String[] args) throws Exception {

        final DityRead dityRead = new DityRead();
        Thread t1 = new Thread(new Runnable() {

            @Override
            public void run() {
                dityRead.setValue("zs", "zsp");
            }
        }, "t1");

        /*
         * Thread t2 = new Thread(new Runnable() {
         * 
         * @Override public void run() {
         * 
         * } }, "t2");
         */

        t1.start();
        Thread.sleep(1000);
        dityRead.getVlaue();
    }

}