Object obj=new Object(); Object obj2=obj; synchronized(obj){} synchronized(obj2){} what if this is the case? Object obj=new Object(); synchronized(obj){} obj=new Object(); synchronized(obj){} ...
We know that DCL double lock is written as: synchronized (SingletonLazy5.class) { if(null == singletonLazy) { singletonLazy = new SingletonLazy5(); } } ...
WeChat Mini Programs shopping cart requests shopping cart data in the app.js, and this.carts = app.globalData.carts in the onLoad on the shopping cart page (cart.wxml). on the shopping cart page, there are often operations to select, delete, and modif...
the computer is equipped with both ubuntu and windows systems. after the computer has a black screen, it is reinstalled with windows, but cannot be connected to the Internet. after formatting the computer, it is reinstalled with ubuntu, and can surf th...
when OpenWRT compiles popt- at 16:00, the following error occurs. What s the explanation? *** error: gettext infrastructure mismatch: using a Makefile.in.in from gettext version 0.17 but the autoconf macros are from gettext version 0.18 Makefile:154: ...
vscode, double-click to select a word, for example, double-click to select numbers in the picture, as long as you press ctrl, the window of the css-peek will automatically open in the terminal window. What does this mean and how to set it to cancel? it...
Child pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http: maven.apache.org POM 4.0.0" xmlns:xsi="http: www.w3.org 2001 XMLSchema-instance" xsi:schemaLocation="...