java type parameters
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java type parameters (generics) tutorial
java's type parameter mechanism, commonly referred to as "generics," allows developers to define classes, interfaces, and methods with a placeholder for a type. this feature provides type safety and eliminates the need for casting, making code more robust and easier to read.
#### why use generics?
1. **type safety**: generics allow you to catch type errors at compile time rather than at runtime.
2. **code reusability**: you can write a single class or method that can operate on different types.
3. **elimination of casting**: it reduces the need for explicit type casting, making the code cleaner.
basic syntax
in java, you define a type parameter using angle brackets ``. a common convention is to use a single uppercase letter, like `t` for type, `e` for element, `k` for key, and `v` for value.
generic class
here's how to create a generic class:
explanation
1. **generic class declaration**: the class `boxt` defines a type parameter `t`.
2. **methods**: the methods `setitem` and `getitem` use `t` as the type for the parameter and return type.
3. **instantiation**: when creating a `box`, you specify the type within angle brackets, e.g., `boxinteger`.
generic methods
you can also create generic methods inside non-generic classes:
explanation
1. **generic method declaration**: the method `printarray` uses `t` to declare that it is a generic method.
2. **usage**: the method can accept an array of any type.
bounded type parameters
you can restrict the types that can be used as type parameters using bounds:
explanation
1. **bounded type**: `t extends number` restricts `t` to be a subtype of `number`.
2. **method usage**: the method `doublevalue()` can safely call `doublevalue()` from the `number` class.
wildcards
wildcards in generics allow you to use an unknown type:
explanation
1. **wildcard declaration**: the method `printlist` uses `list?` to accept a li ...
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