Java Packages & Imports

What is a Package?

A package is a way to group related classes together. It helps organize your code, especially in large applications.

Think of packages like folders on your computer that store related files.

Output:

Use the package keyword at the top of your file to define which package the class belongs to.

The package name usually matches the folder structure of your project.

Output:

The import keyword allows you to use classes from other packages without writing their full path.

This makes your code cleaner and easier to read.

Output:

Java includes many built-in packages that provide useful classes.

For example, java.util includes tools like Scanner and ArrayList.

Output:

You can import all classes from a package using the * symbol.

This is useful for quick programs, but in larger applications, it is better to import only what you need.

Output:

You can create your own packages and import them into other classes.

This is commonly used in real-world projects to separate logic into different modules.

Output:

If you do not declare a package, your class is placed in the default package.

This is fine for small programs, but not recommended for larger applications.

Packages help organize your code and make it easier to maintain.

Create a utilities package with a MathHelper class and use it in another class.

Output: