Generic methods and generic classes for Java function generics

Java generics include generic methods and generic classes. Generic methods allow the use of a single method to handle different types of data, the type of which is parameterized by the method (for example, List getElements(List list)); generic classes allow the creation of general classes that can be used with different data types (e.g., List getElements(List list)) For example, class MyGenericClass { private T value; }).

Generic methods and generic classes of Java function generics

Generic methods

Generic methods allow you to create methods in which the type is parameterized rather than explicitly specified as a specific data type. This way you can use one method to handle different types of data without having to write a different method for each data type.

public static <T> List<T> getElements(List<T> list) {
    // 在此处操作列表元素
    return list;
}

In this method, T is a type variable, indicating that the method can handle any type of data.

Practical case:

List<Integer> intList = getElements(List.of(1, 2, 3));
List<String> stringList = getElements(List.of("a", "b", "c"));

Generic classes

Generic classes allow you to create classes whose data types are not Fixed, but specified by the parameterized type. This allows you to create generic classes that can be used with different data types.

public class MyGenericClass<T> {
    private T value;

    public MyGenericClass(T value) {
        this.value = value;
    }

    public T getValue() {
        return value;
    }
}

In this class, T is a type variable, indicating that this class can handle any type of data.

Practical case:

MyGenericClass<Integer> intClass = new MyGenericClass<>(10);
MyGenericClass<String> stringClass = new MyGenericClass<>("Hello");

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