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2. In the above example, a set of state objects are created for each Context object. In fact, these state objects can be shared, and each Context object can share one state object. This is also one of the application scenarios of the meta-sharing mode此战获胜，大家都会立下大功，跟着本帅一起杀敌。Earlier this year, a blackmail software called "WannaCry" began to attack the Internet, from Chinese universities to British hospitals. In April this year, IDT, a Newark, New Jersey-based telecommunications company, suffered a similar attack, which was discovered by Goran Ben-Oni, the company's global chief operating officer. As Ben Oni said in an interview with the New York Times, he immediately realized that this blackmail software attack is different from other attacks against companies. It not only steals the information in the databases it infiltrates, but also steals the information needed to access these databases. This kind of attack means that hackers can not only obtain this information quietly, but also continuously monitor who accesses this information.Hearing this, I think of the famous carnivorous fish-sawtooth salmon, which lives in tropical waters and fears almost all creatures living with them, including crocodiles, which are known as freshwater overlords, and a more familiar name, namely "piranha". However, the serrated salmon has made such a "world-famous" reputation for its small size. In addition to the large number, In addition to his fierce temperament, It is also closely related to their unique tooth structure, The teeth of salmon, Is sharp on both sides, The middle is sharp and densely arranged, and has a strong cutting function for all kinds of skin and meat. Therefore, although its mouth is not large, it can basically tear off a large piece of meat with one bite. Similar examples include the teeth of great white sharks, which also have such functions. However, the individual size of great white sharks is too large to be compared with serrated salmon, and its lethality cannot be compared.I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.Copper clad aluminum