Java ZipEntry setCreationTime() function with examples

The setCreationTime() function is a part of java.util.zip package. The function is used to set the Creation Time of Zip Entry . The Function takes FileTime object as parameter.
The FileTime Object, which represents the creation time of the ZipEntry .
Function Signature :

public void setCreationTime(FileTime v)

Syntax :

zip_entry.setCreationTime(v);

Parameters :The function takes FileTime object as parameter, the time of creation of the file.
Return value :The function does not take any parameter
Exceptions :The function throws NullPointerException if the time is null

Below programs illustrates the use of setCreationTime() function
Example 1: We will create a file named zip_file and get the zip file entry using getEntry() function and then set the CreationTime of the specified ZipEntry.”file.zip” is a zip file present in f: directory. we will take a “.zip” file as ZipEntry

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

import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
import java.nio.file.attribute.*;

public class solution {
    public static void main(String args[])
    {
        try {
            // Create a Zip File
            ZipFile zip_file = new ZipFile("f:\\file1.zip");

            // get the Zip Entry using
            // the getEntry() function
            ZipEntry entry = zip_file.getEntry("file.zip");

            // set the CreationTime
            // using the setCreationTime()
            // function
            entry.setCreationTime(FileTime.fromMillis(100000));

            // Get the CreationTime
            // using the getCreationTime()
            // function
            FileTime input = entry.getCreationTime();

            // Display the CreationTime
            System.out.println("CreationTime : " + input.toString());
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

Output:

CreationTime : 1970-01-01T00:01:40Z

Example 2: We will create a file named zip_file and get the zip file entry using getEntry() function and then set the CreationTime of the specified ZipEntry.”file.zip” is a zip file present in f: directory. We will set the value of creation time to null. we will take a “.cpp” file as ZipEntry

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

import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
import java.nio.file.attribute.*;

public class solution {
    public static void main(String args[])
    {
        try {
            // Create a Zip File
            ZipFile zip_file = new ZipFile("f:\\file1.zip");

            // get the Zip Entry using
            // the getEntry() function
            ZipEntry entry = zip_file.getEntry("file.zip");

            // set the CreationTime
            // using the setCreationTime()
            // function
            entry.setCreationTime(null);

            // Get the CreationTime
            // using the getCreationTime()
            // function
            FileTime input = entry.getCreationTime();

            // Display the CreationTime
            System.out.println("CreationTime : " + input.toString());
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

Output:

CreationTime :

The Program terminated due to error as null value is set

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/zip/ZipEntry.html#setCreationTime-java.nio.file.attribute.FileTime-