ZipFile entries() function in Java with examples

The entries() function is a part of java.util.zip package. The function returns the enumeration of zip file entries of the zip file.

Function Signature:

public Enumeration entries()

Syntax:

zip_file.entries();

Parameters: The function does not require any parameters

Return value: The function returns the enumeration of zip file entries of the zip file, the enumeration contains the ZipEntry of all the files in the zip file.

Exceptions: The function throws IllegalStateException if the zip file has been closed.

Below programs illustrates the use of entries() function

Example 1: Create a file named zip_file and get the zip file entries using entries() function. “file.zip” is a zip file present in f: directory.

// Java program to demonstrate the
// use of entries() function

import java.util.zip.*;
import java.util.Enumeration;

public class solution {
    public static void main(String args[])
    {

        try {

            // Create a Zip File
            ZipFile zip_file
                = new ZipFile("f:\\file.zip");

            // get the Zip Entries using
            // the entries() function
            Enumeration<? extends ZipEntry> entries
                = zip_file.entries();

            System.out.println("Entries:");

            // iterate through all the entries
            while (entries.hasMoreElements()) {
                // get the zip entry
                ZipEntry entry = entries.nextElement();

                // display the entry
                System.out.println(entry.getName());
            }
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

Output:

Entries:
file3.cpp
file1.cpp
file2.cpp

Example 2: Create a file named zip_file and get the zip file entries using entries() function. This function throws exception if we close the file and then call the function entries().

// Java program to demonstrate the
// use of entries() function

import java.util.zip.*;
import java.util.Enumeration;

public class solution {
    public static void main(String args[])
    {

        try {

            // Create a Zip File
            ZipFile zip_file
                = new ZipFile("f:\\file.zip");

            // close the zip file
            zip_file.close();

            // get the Zip Entries using
            // the entries() function
            Enumeration<? extends ZipEntry> entries
                = zip_file.entries();

            System.out.println("Entries:");

            // iterate through all the entries
            while (entries.hasMoreElements()) {

                // get the zip entry
                ZipEntry entry = entries.nextElement();

                // display the entry
                System.out.println(entry.getName());
            }
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

Output:

zip file closed

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/zip/ZipFile.html#entries()