The role of Java function generics in polymorphism: Provide polymorphism, allowing functions to operate on different types of data. Improved code maintainability, flexibility, and reduced duplication. Syntax: 8742468051c85b06f0a0af9e3e506b5c void myFunction(T argument), where T is a generic type parameter. Actual case: Generic function to calculate the size of a data list int size(List8742468051c85b06f0a0af9e3e506b5c list) { return list.size(); }. Advantages: Code reusability, flexibility, type safety.
The role of Java function generics in polymorphism
Function generics in Java provide polymorphism, allowing Create general-purpose functions that operate on different types of data. Polymorphism makes code more maintainable, more flexible, and helps reduce code duplication.
Syntax
A function declaration containing function generics looks like this:
<T> void myFunction(T argument) { // 操作 Argument }
where T
is the generic type parameter , will be replaced with the actual type at compile time.
Actual case
Consider a function that calculates the size of a data list:
int size(List<?> list) { return list.size(); }
The function takes a wildcard type parameter?
, indicating that the function can receive any type of list. However, we cannot directly call the size()
function:
List<Integer> integers = new ArrayList<>(); int result = size(integers); // 编译错误:无法将 List<Integer> 赋值给 List<?>
To solve this problem, we can use a generic function:
<T> int size(List<T> list) { return list.size(); }
Now, we can safely call size()
Function:
int result = size(integers); // 成功编译
Advantages
Using function generics to provide polymorphism has the following advantages:
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