Packages

• put a package statement at the very top of every source file in that package
• package of a type should match the folder path of the source file

package seedu.tojava.util;
 
public class Formatter {
    public static final String PREFIX = ">>";
 
    public static String format(String s){
        return PREFIX + s;
    }

Convention

• package names are written in all lower case

Using package member outside the package

• use the full qualified name
• Import the package or the specific package member e.g.

package seedu.tojava; 
 
import seedu.tojava.util.StringParser; 
import seedu.tojava.frontend.*;

Notes:

• importing a package does not import it’s sub-packages
  • packages do not have hierarchies despite appearances!
• If there is no package statement, it means that the type does not have a package
• You can use a static import to import static members of a type

import static seedu.tojava.util.Formatter.PREFIX;
import static seedu.tojava.util.Formatter.format;
 
public class Main {
 
    public static void main(String[] args) {
 
        String formatted = format("Hello");
        boolean isFormatted = formatted.startsWith(PREFIX);
        System.out.println(formatted);
    }
}