Difference Between Package and Interface in Java

Java code structure and organization rely significantly on packages and interfaces. They are working in various circumstances and for different purposes. We will explore the fundamental concepts behind Java packages and interfaces in this article. Both packages and interfaces act as a kind of container. Classes can use the contents of packages and interfaces by importing and implementing them appropriately. A package comprises a collection of classes and interfaces, whereas an interface is made up of variables and methods. This is the fundamental distinction between packages and interfaces. With the aid of the comparison chart, let's examine some other distinctions.

Packages in Java:

In Java, a package is a way to group similar classes and interfaces into a single entity. It makes managing and maintaining a big codebase easier by offering a mechanism to organize classes and interfaces according to their functionalities.

Syntax:

Implementation:

FileName: PackageMypack.java

package com.javatpoint.mypack;
public class PackageMypack 
{
    public void display() {
        System.out.println("Hello Welcome to the packages concept.");
    }

    public static void main(String[] args) {
        PackageMypack obj = new PackageMypack();
        obj.display();
    }
}

Output:

Hello Welcome to the packages concept.

Interfaces in Java:

In Java, an interface specifies the agreement that a class has to abide by. Method signatures without implementations are present in it. Concrete implementations for each method declared in an interface must be provided by the classes that implement it. Java supports multiple inheritance and achieves abstraction through the usage of interfaces.

Syntax:

public interface MyInterface 
{
    //Declare the methods
    void method1();
    void method2();
}

Implementation:

FileName: InterfacesImplementation.java

interface MyInterface1 
{ 
	void displaymethod(); 
} 
class InterfaceClass implements MyInterface1 
{ 
	public void displaymethod() { 
		System.out.println("Hello Welcome to the interfaces concept."); 
	} 
} 
public class InterfacesImplementation
{ 
	public static void main(String[] args) 
	{ 
		InterfaceClass obj = new InterfaceClass(); 
		obj.displaymethod(); 
	} 
}

Output:

Hello Welcome to the interfaces concept.

Tabular Differences between Packages and Interfaces:

Characteristics	Packages	Interfaces
Purpose	It Groups related interfaces and classes together into a single unit.	Establish a contract that the classes will follow.
Relation-ship	The HAS-A relationship is also represented via the Java Package.	The IS-A relationship is also represented via the Java Interface.
Syntax	Declared with the package keyword.	Declared with the interface keyword.
Usage	On the basis of functionality, class and interface groups are created.	Specify the method signatures for which implementations must be provided by the classes that implement the interface.
Accessibility	Access modifiers are a useful tool for controlling package visibility.	Interface techniques are inherently abstract and public.
Multiple Inheritance	Does not allow for multiple inheritance.	Allows for multiple inheritance since a class might have numerous interfaces implemented.
Example	package com.javatpoint.mypack;	public interface display { void show(); }