[Dev] Best approach to optimize imports in Java

[Aruna Karunarathna]

Hi all,

For e.g I have a java file with following imports.

Scenario 1

import java.io.*;
import java.util.*;
import java.util.zip.*;

Scenario 2

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

In scenario 1 we have put * and match the imports in a bad way and in
Scenario 2 you define the exact imports. I know that the Scenario 2 is the
ideal.
But in default Intellij IDEA, if we are importing more than 5 imports it
automatically put the java.io.* (This can be changed by Settings > Code
Style > Java > imports tab   Setting the "class count to use import with *"
to some higher value)

My questions are,
What is the best way to optimize imports in above scenario?
Do we have a best  practice for "class count to use import with *" in a
java file in WSO2?
Does the import order matter?

Highly appreciate your thoughts on this.

Regards,
Aruna

-- 

*Aruna Sujith Karunarathna* | Software Engineer
WSO2, Inc | lean. enterprise. middleware.
#20, Palm Grove, Colombo 03, Sri Lanka
Mobile: +94 71 9040362 | Work: +94 112145345
Email: ar...@wso2.com | Web: www.wso2.com

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