T is used to make generic .What is T ? It is class or variable or anything else.
Generic bubblesort
T is a special keyword (like main,int, scan etc) in the Java Documentation and is used to define generic classes. T is basically a placeholder for other data types when the data type is not known beforehand and is filled at run time by concrete data types like int,char. So it can be used to implement polymorphism.
For example, in a generic bubble sort function, depending on the data we provide at runtime, it can sort numbers, characters, decimals, integers etc.
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