What does import java.util.* mean?

[import java.util.*;]Import the class interface in the java.util package. The function of import in Java is to import the class interface in the package to be used. Import is at the beginning of the java file. First explain which categories will be used, and then we can specify a class in the code using only the class name.

import java.util.*;Import the class interface in the java.util package.

The function of import in Java is to import the class interface in the package to be used. Import is at the beginning of the java file. First explain which categories will be used. Then we can specify a class in the code using only the class name, that is, only call it by its first name, not its last name. The role of the package is to sort and classify Java classes. Java classes with different business logic are placed in the same package. Such as physical packages and tool kits.

Java's utility class library java.util package. In this package, Java provides some practical methods and data structures. This chapter introduces the Java utility class library java.util package. In this package, Java provides some practical methods and data structures. For example, Java provides the Date (Data) class and Calendar (Calendar) class to generate and obtain dates and times, provides the Random Number (Random) class to generate various types of random numbers, and also provides Stack (Stack) and Vector (Vector). , bitset (Bitset) and hash table (Hashtable) and other classes to represent the corresponding data structure.

In high-level programming languages, if you want to use a certain class or interface, you must use import to import this class. For example, when writing a servlet in Java and using httpServlet, you must add it at the beginning of the file (package After) write, import javax.servlet.http.*; means importing all the files in the javax.servlet.http package.

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