Multi-line Comments
To describe a full method in a code or a complex snippet single line comments can be tedious to write since we have to give ‘//’ at every line. So to overcome this multi-line comments can be used. Multi-line comments start with /* and end with */. Any text between /* and */ will be ignored by Java. It is used to comment multiple lines of code.
Now, let’s take a small example to know how multi-line comments can be used.
To describe a full method in a code or a complex snippet single line comments can be tedious to write since we have to give ‘//’ at every line. So to overcome this multi-line comments can be used. Multi-line comments start with /* and end with */. Any text between /* and */ will be ignored by Java. It is used to comment multiple lines of code.
Now, let’s take a small example to know how multi-line comments can be used.
August 25, 2020
August 25, 2020
You can see in the above example I have used multi-line comments to comment on the lines in a program. That’s how it works. Now, let’s understand what is documentation comments.
August 25, 2020
Documentation Comments
This type of comments is used generally when you are writing code for a project/ software package. It helps you to generate a documentation page for reference, which can be used for getting information about methods present, its parameters, etc.
This type of comments is used generally when you are writing code for a project/ software package. It helps you to generate a documentation page for reference, which can be used for getting information about methods present, its parameters, etc.
August 25, 2020
What are Java Keywords and reserved words?
Keywords are predefined which have a unique meaning and functionality in Java programming language. These keywords are also known as reserved keywords which mean they cannot be used as a variable name, class, method or any other identifier. There are 57 reserved keywords in Java. Meanwhile, in this huge list of java keywords, there are some which are not used anymore and few versions do not support a tiny number of keywords.
Keywords are predefined which have a unique meaning and functionality in Java programming language. These keywords are also known as reserved keywords which mean they cannot be used as a variable name, class, method or any other identifier. There are 57 reserved keywords in Java. Meanwhile, in this huge list of java keywords, there are some which are not used anymore and few versions do not support a tiny number of keywords.
August 25, 2020
August 25, 2020
August 25, 2020
August 25, 2020
August 25, 2020
August 25, 2020
What is a Constructor in Java?
We create a constructor to initialize an object. They have the same name as the class but have no explicit return type. It can be used to set initial values for object attributes. It is similar to a Java method
At the time of calling the constructor, the memory is allocated for the object. Each class in Java has a constructor. Even if you do not create one, Java implicitly calls a constructor with all data members value set to zero.
We create a constructor to initialize an object. They have the same name as the class but have no explicit return type. It can be used to set initial values for object attributes. It is similar to a Java method
At the time of calling the constructor, the memory is allocated for the object. Each class in Java has a constructor. Even if you do not create one, Java implicitly calls a constructor with all data members value set to zero.
August 25, 2020
August 25, 2020
When is a Constructor Called?
A constructor is called when an object or an instance is created. It is used to assign values to the data members of the same class.
Rules For Constructors in Java
1 The name of the constructor should be the same as that of the class name.
2 A constructor cannot be declared as final, static, synchronized or abstract.
3 It cannot have an explicit return type.
4 A constructor can have an access modifier to control the access.
You should follow these rules while creating a constructor.
Types of Constructors in Java
There are two types of constructors
1 Default Constructor
2 Parametrized Constructor
Default Constructor
A constructor with no arguments is called a default constructor. If we do not create a constructor of a class, Java creates a default constructor with data members which has values like zero, null, etc.
But, if we specify a constructor with no arguments, it will be a default constructor or a no argument constructor which is another name for default constructor. Following is an example to show how to use a default constructor in Java:
A constructor is called when an object or an instance is created. It is used to assign values to the data members of the same class.
Rules For Constructors in Java
1 The name of the constructor should be the same as that of the class name.
2 A constructor cannot be declared as final, static, synchronized or abstract.
3 It cannot have an explicit return type.
4 A constructor can have an access modifier to control the access.
You should follow these rules while creating a constructor.
Types of Constructors in Java
There are two types of constructors
1 Default Constructor
2 Parametrized Constructor
Default Constructor
A constructor with no arguments is called a default constructor. If we do not create a constructor of a class, Java creates a default constructor with data members which has values like zero, null, etc.
But, if we specify a constructor with no arguments, it will be a default constructor or a no argument constructor which is another name for default constructor. Following is an example to show how to use a default constructor in Java:
August 25, 2020
August 25, 2020
Parametrized Constructor
A constructor which has arguments is called as a parametrized constructor. It is used to assign values to distinct objects. Following is an example to show how we declare a parameterized constructor in java:
A constructor which has arguments is called as a parametrized constructor. It is used to assign values to distinct objects. Following is an example to show how we declare a parameterized constructor in java:
August 25, 2020
August 25, 2020
Constructor Overloading
Just like method overloading, constructors can be overloaded to create objects in different ways. The compiler differentiates constructors based on how many arguments are present in the constructor and other parameters like the order in which the arguments are passed.
Following is an example of constructor overloading:
Just like method overloading, constructors can be overloaded to create objects in different ways. The compiler differentiates constructors based on how many arguments are present in the constructor and other parameters like the order in which the arguments are passed.
Following is an example of constructor overloading:
August 25, 2020
August 25, 2020
August 25, 2020
August 25, 2020