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D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:黑道商人Thanupat（Chap）逼婚Roong（Grace）的姐姐，姐姐不愿意嫁，Roong助其逃婚，不得不代替姐姐嫁给Thanupat……Big Brother Strong Invincible Ben Meng Xin Has Been DizzyHBO宣布续订喜剧《不安感》第三季。A complete computer system consists of hardware and software. As the name implies, hardware is the physical equipment that can be seen and touched in the computer, such as the host computer. Software, on the other hand, is relative to hardware. It refers to various programs and related documents needed to run on the computer, such as a drawing software or a gobang game. Computer hardware and software are indispensable. Hardware is the material basis on which software can work and is the "body". Software is the soul of the computer and the core of controlling and operating the computer. They complement each other and form a complete computer system. From the appearance, the computer includes: monitor, host computer, keyboard, mouse and sound box.然后，一代剑魔从此出现，《独孤九剑》横扫天下。讲述楚逸、江北辰、夏天几位同学为拍古风短剧而发生的校园故事。