import java.util.*;
import java.util.jar.*;
import java.io.*;

public class MainJarAtr{
	public static void main(String[] args){
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		try {
			System.out.print("Enter jar file name: ");
			String filename = in.readLine();
			if(!filename.endsWith(".jar")){
				System.out.println("File not in jar format.");
				System.exit(0);
			}

			File file = new File(filename);
			if (file.exists()){
				// Open the JAR file
				JarFile jarfile = new JarFile(filename);

				// Get the manifest
				Manifest manifest = jarfile.getManifest();

				// Get the main attributes in the manifest
				Attributes attrs = (Attributes)manifest.getMainAttributes();

				// Enumerate each attribute
				for (Iterator it=attrs.keySet().iterator(); it.hasNext(); ) {
					// Get attribute name
					Attributes.Name attrName = (Attributes.Name)it.next();
					System.out.print(attrName + ": ");
					
					// Get attribute value
					String attrValue = attrs.getValue(attrName);
					System.out.print(attrValue);
					System.out.println();
				}
			}
			else{
				System.out.print("File not found.");
				System.exit(0);
			}
		}
		catch (IOException e) {}
	}
}