Wildcards T, e, K, V,? Winter anthracene
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Java
In essence, these are wildcards, no difference, but a conventional thing in coding. For example, we can replace t in the above code with any letter between A-Z, which will not affect the normal operation of the program, but if we replace T with other letters, it may be less readable. Usually, t, e, K, V,? It is agreed as follows:
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