Difference Between Packages vs. Interfaces in Java

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Main Difference

The difference between packages and interfaces in java is that a package in java contains a group of classes and interfaces whereas an interface in java contains methods and fields.

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Packages vs. Interfaces in Java

Java is an object-oriented programming language that uses both compiler and interpreter. Mostly all software’s are made in Java programming language. Java code can be written on Windows, Linux, and Mac OS. The syntax of C and C++ programming language is quite the same. Java produces browser to run programs that help in making a graphical user interface. Java programming language is in used and trend these days. To write Java code, a programmer needs software development kit (SDK) that includes a compiler, interpreter that is not required in C++. Packages and interfaces are two most important aspect in java, if we talk about the main difference between packages and interfaces in java, then the main difference between packages and interfaces in java is that a package in java contains a group of classes and interfaces whereas an interface in java contains methods and fields. A package in java contains a group of classes and interfaces. By using inheritance, the classes in packages are related to each other. You can make a package and can use it. If we want to create a package first open a file and then declare the name of the package at the top of the file for example package name; and package name is the name you want. After this step, you define a class that you want to put in the package. The class can be public or private. The step to create a package for this file the command used is javac-d, and file name will be file_name.java. Subpackage can also be created by declaring the subpackage name as [ package package_name 1. Package_name2] . An import statement can be used to use the package that you have created before. The import statement is used to use the package before. An interface in java contains methods and fields. In the interface the method is declared are abstract. They methods are always public, static and final. At the time of declaration, the fields must be initialized. In runnable interface, in java, multiple threads share the same objects. Like thread class runnable is also an interface in java.lang package. To define a thread, a runnable interface is created. The thread is program execution that uses the process resources for the task. The process contains thread; the process is a container and thread is a content of that container. The kernel of operating system allocates a stack and a thread control block to each thread. The thread control block is responsible for switching between the threads of the same process. There are types of threads such as kernel-lever threads, user-level threads, hybrid threads. There are further three states of thread such as running, ready and blocked. There is priority property in threads in this way there are multiple threads are active. One system can create one thread. The thread can share data and information whereas process cannot. In multithreading, multiple threads are created. A thread in multithreading is a process means a code segment of a process. A thread in the runnable interface has its own thread ID, program counter, registers, and stack. If we create separate processes for each service, then each processor share code, data and system resources. If we do not create threads, the system can get exhausted. Creating threads can make processor easy for working. The responsiveness is increased in multithreading, and this is the best advantage of using multithreading. The big advantage of runnable interface in java is resource sharing and in resource sharing the several threads of a process share same code.

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Comparison Chart

BasisPackagesInterface
MeaningA package in java contains a group of classes and interfacesAn interface in java contains methods and fields.
KeywordKeyword “Packages” is used to create packagesKeyword “Interface” is used to create interface
AccessA package in java can be importedAn interface in java can be accessed by another interface
Access keywordAccess keyword for packages is “import.”Access keyword for the interface is “implement.”

What are Packages?

A package in java contains a group of classes and interfaces. By using inheritance, the classes in packages are related to each other. You can make a package and can use it. If we want to create a package first open a file and then declare the name of the package at the top of the file for example package name; and package name is the name you want. After this step, you define a class that you want to put in the package. The class can be public or private. The step to create a package for this file the command used is javac-d, and file name will be file_name.java. Subpackage can also be created by declaring the subpackage name as [ package package_name 1. Package_name2] . An import statement can be used to use the package that you have created before. The import statement is used to use the package before.

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What is an Interface?

An interface in java contains methods and fields. In the interface the method is declared are abstract. They methods are always public, static and final. At the time of declaration, the fields must be initialized. In runnable interface, in java, multiple threads share the same objects. Like thread class runnable is also an interface in java.lang package. To define a thread, a runnable interface is created. The thread is program execution that uses the process resources for the task. The process contains thread; the process is a container and thread is a content of that container. The kernel of operating system allocates a stack and a thread control block to each thread. The thread control block is responsible for switching between the threads of the same process. There are types of threads such as kernel-lever threads, user-level threads, hybrid threads. There are further three states of thread such as running, ready and blocked. There is priority property in threads in this way there are multiple threads are active. One system can create one thread. The thread can share data and information whereas process cannot. In multithreading, multiple threads are created. A thread in multithreading is a process means a code segment of a process. A thread in the runnable interface has its own thread ID, program counter, registers, and stack. If we create separate processes for each service, then each processor share code, data and system resources. If we do not create threads, the system can get exhausted. Creating threads can make processor easy for working. The responsiveness is increased in multithreading, and this is the best advantage of using multithreading. The big advantage of the runnable interface in java is resource sharing and in resource sharing the several threads of a process share same code.

Key differences

  1. A package in java contains a group of classes and interfaces whereas an interface in java contains methods and fields.
  2. Keyword “Packages” is used to create packages whereas keyword “Interface” is used to create an interface.
  3. A package in java can be imported whereas, the interface in java can be accessed by another interface.
  4. Access keyword for packages is “import” whereas Access keyword for the interface is “implement.”

Comparison Video