How to use java unbounded wildcards

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Description

1. If you are writing a method that can be implemented using the functionality provided in the Object class. Unbounded wildcard types are specified using wildcards.

For example, list

. This is called a list of unknown types.

2. Contemporary codes use methods that do not depend on type parameters in generics.

For example, List.size or List.clear. In fact, many methods of using Class do not depend on T, so Class is often used (Class is so often used because most of the methods in Class do not depend on T.).

Example

Public static void printList (List list) {for (Object elem: list) System.out.println (elem + "); System.out.println ();} what are the basic data types of java? the basic data types of Java are as follows:

1. Integer type, which is used to represent the data type of integer.

2. Floating point type, which is used to represent the data type of decimals.

3. Character type. The keyword of character type is "char".

4. Boolean type, which is the basic data type that represents logical values.

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