What are the functions of generics in java

The functions of generics are as follows:

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1. Type safety

The main goal of generics is to improve the type safety of Java programs. Strong type checking at compile time; by knowing the type restrictions of variables defined using generics, the compiler can verify type assumptions to a much higher degree. Without generics, these assumptions exist only in the programmer's mind (or, if you're lucky, in code comments).

2. Eliminate casts

A side benefit of generics is the elimination of many casts in the source code. This makes the code more readable and reduces the chance of errors.

3. Potential performance gains

Generics bring the possibility of greater optimization. In the initial implementation of generics, the compiler inserts casts (without generics, the programmer would specify these casts) into the generated bytecode. But the fact that more type information is available to the compiler opens up the possibility of optimizations in future versions of the JVM.

Due to the way generics are implemented, supporting generics requires (almost) no JVM or class file changes. All the work is done in the compiler, which generates code similar to what you would write without generics (and casts), only more type-safe.

The benefit of introducing generics into the Java language is safety and simplicity. The advantage of generics is that type safety is checked during compilation, and all casts are automatic and implicit, improving code reuse.

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4. Better code reusability

, such as implementing generic algorithms.

During the framework design, BaseDao, BaseService, BaseDaoImpl, and BaseServiceImpl are implemented through inheritance to abstract all public methods and avoid having to write the same ones every time. code.

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