import net.lingala.zip4j.io.inputstream.ZipInputStream;
import net.lingala.zip4j.model.LocalFileHeader;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.File;
import java.io.IOException;

public class SampleClass{
  
  public static void main(String[] args)
                     throws IOException{
    LocalFileHeader lfh = null;
    byte[] buffer = new byte[3072];
    
    FileInputStream fis = 
    new FileInputStream(new File("myzip.zip"));
    try(ZipInputStream zis = 
        new ZipInputStream(fis, "password".toCharArray())){
        
      while((lfh = zis.getNextEntry()) != null){
        File extractedFile = new File(lfh.getFileName());
          
        try(FileOutputStream fos = new 
            FileOutputStream("extracted/"+extractedFile)){
            
            int len = 0;
            while((len = zis.read(buffer)) != -1)
              fos.write(buffer);
        }
      }
    }
  }
}