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4. Obtain process instances and tasks according to business keysReturn context.getNum1 () + context.getNum2 ();Later, an optimized form evolved, namely content-based e-commerce. Instead of selling goods directly, the stage of content consumption is increased before purchase, and the effect is consumption decision. In other words, by planning the content that users may be interested in, sufficient purchase reasons are provided for users to place orders, thus improving product stickiness, re-purchase or transformation.The life cycle of an object is managed by Spring, which directly obtains an object from Spring. IOC is the abbreviation of Inversion Of Control, just like control is handed over to Spring from its own hands.8-3 T-shirt: Write a function called make _ shirt () that accepts a size and the words to be printed on the T-shirt. This function should print a sentence outlining the size and words of the T-shirt. Use position arguments to call this function to make a T-shirt; Then use the keyword argument to call this function. ?Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.