Difference Between Structure vs. Class in Java

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Main Difference

The difference between structure and class is that in structure if access specifier is not declared all members are public whereas in class if access specifier is not declared all members are private.

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Structure vs. Class 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++. In structure, if access specifier is not declared all members are public whereas in class if access specifier is not declared all members are private. A collection of variables of dissimilar data types is known as the structure and all references by one name. A template is formed that is a structure declaration form and is used to create an instance of a structure. By using struct name { type struct_element1, type struct element2, ….} variable 1, variable 2 that structure is produced. A keyword “struct” is used to defined a structure. The keyword “sname” is used to name the structure. Semicolon is used to end the statement. If a class has more than one abstract method, it is known as abstract class. Keyword abstract is used to create an abstract class. Other classes can inherit from the abstract class. The class is one of the most important features in Java programming. We cannot implement a java implement in java programming if we don’t know about to implement the class. Classes in java programming are also used to create objects because class creates reference type. In the signature of a class, there is a body of class that is the class’s name and all the information. In the main body of the class, there is fields and methods of the class. The objects in class can be static and non-static. The keyword class is used for making a class in java programming. Each object created in java contain and copy field and methods. Access specifier decides the visibility and accessibility of the members of the subclass. Inheritance can be done by using access specifier in Java programming. One class inherit the objects and methods of the other class.

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Comparison Chart

BasisStructureClass
MeaningIn structure, if access specifier is not declared all members are publicIn class, if access specifier is not declared all members are private.
DeclarationDeclaration of structure is struct structure name{}Declaration of class is class class_name{}
InstanceAn instance of the structure is “structure variable.”An instance of a class is an object is “class” and “object.”
TypesType of structure is array, list, and link listType of class is an abstract class.

What is structure?

A collection of variables of dissimilar data types is known as the structure and all references by one name. A template is formed that is a structure declaration form and is used to create an instance of a structure. By using struct name { type struct_element1, type struct element2, ….} variable 1, variable 2 that structure is produced. A keyword “struct” is used to define a structure. The keyword “sname” is used to name the structure. The semicolon is used to end the statement.

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Array structure

The array is a collection of variables of some data type. There is a common name of an array that is defined. At the start of code size of the array is defined the size of the array means some elements in an array.

Link list structure

A linked list is a data structure that uses references; each node is referred to another node. Linked list there is a sequence of the element where each node is connected to another node. Each node is given the reference of another node, so it makes a linked list. There are two fields in the linked list that are most important which are data field, and other is link field. There are actual data in the data field, and these data fields are connected through the data field.

The way data fields are connected is that link field contains the address of data fields. The pointer plays a significant role in this regard; pointer keeps the address of the data field. The array has a fixed sized, and link list does not have fixed sized, in case of the array we need to declare the size of the array where in link list it is not necessary to declare the size of link list first.

List structure

The list is an interface that extends the collection interface. The list is a collection of ordered element and elements are added, removed and accessed with the help of an index variable. There cannot be any duplicate elements in sets, but there can be duplicate elements in the list. There are some common methods in list that are index-based get() and set() method. There are also add a () method that is used to add elements in the list, and another method removes () that is used to remove elements in the list. We can also say that list is a kind of array that can grow size as we add elements in the list. There is no method to set the range of indexed in a list. There is just a sub list() method that returns sub list from the original list of a specific range.

Set structure

Set is a collection of objects in which there is no duplicate element. Two references cannot refer to one single object and vice versa. Reference cannot be a null reference. There is no method to add elements in set it has add() method and addall() method. Duplicates are not allowed in sets. HashSet, LinkedHashset, EnumSet, TreeSet, CopyOnWriteArraySET.

What is Class?

If a class has more than one abstract method, it is known as an abstract class. Keyword abstract is used to create an abstract class. Other classes can inherit from the abstract class. The class is one of the most important features in Java programming. We cannot implement a java implement in java programming if we don’t know about to implement the class. Classes in java programming are also used to create objects because class creates reference type. In the signature of a class, there is a body of class that is the class’s name and all the information. In the main body of the class, there is fields and methods of the class. The objects in class can be static and non-static. The keyword class is used for making a class in java programming. Each object created in java contain and copy field and methods. Access specifier decides the visibility and accessibility of the members of the subclass. Inheritance can be done by using access specifier in Java programming. One class inherit the objects and methods of the other class.

Key Differences

  1. In structure, if access specifier is not declared all members are public whereas in class if access specifier is not declared all members are private.
  2. Declaration of the structure is struct structure name{} whereas declaration of the class is class class_name{}.
  3. An instance of the structure is “structure variable” whereas an instance of the class is an object is “class” and “object.”
  4. Type of structure is array, list and link list whereas the type of class is an abstract

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