In Java, enumeration What do you mean?

What is enumeration? > meaning?

Is there any way to represent general purpose?

Solution

<？> Syntax is Java's way of specifying that a generic type is "unbounded" - that is, it can be "anything"

Enumeration Is an enumeration with unbounded type – you can assign any type of enumeration to such a variable, for example:

Vector<String> v = new Vector<String>();
Enumeration<String> es = v.elements();
Enumeration<?> e = es; // This assignment compiles OK

However, there is no limit to enumerating The nexterelement () method of The return type is object (even if it is actually an enumeration < string >), so you may need to cast:

String s = (String)e.nextElement(); // Unsafe cast - compiler warning

For background, enumeration is a typed interface with two methods hasMoreElements () and. Iterable and iterator replace the early (poor) attempts Some old classes use it, such as vector and stringtokenizer