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Java > Learn Java > What is a constructor in Java?
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What is a constructor in Java?

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My teaching experience 12 years

In Java, a constructor is a special method that is called when an object is created using the new keyword. It has the same name as the class and is used to initialize the object's state. Constructors play a crucial role in setting up initial values for the instance variables and performing any necessary...
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In Java, a constructor is a special method that is called when an object is created using the new keyword. It has the same name as the class and is used to initialize the object's state. Constructors play a crucial role in setting up initial values for the instance variables and performing any necessary setup tasks when an object is instantiated. read less
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My teaching experience 12 years

In Java, a constructor is a special method that is called when an object is created using the new keyword. It has the same name as the class and is used to initialize the object's state. Constructors play a crucial role in setting up initial values for the instance variables and performing any necessary...
read more
In Java, a constructor is a special method that is called when an object is created using the new keyword. It has the same name as the class and is used to initialize the object's state. Constructors play a crucial role in setting up initial values for the instance variables and performing any necessary setup tasks when an object is instantiated. read less
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Python trainer believe in practical learning.

In Java, a constructor is a special type of method within a class that gets invoked automatically when an object of that class is created. Its primary purpose is to initialize the object's state or assign initial values to its instance variables. Constructors have the same name as the class and do not...
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In Java, a constructor is a special type of method within a class that gets invoked automatically when an object of that class is created. Its primary purpose is to initialize the object's state or assign initial values to its instance variables. Constructors have the same name as the class and do not have any return type, not even void.

They can be used to perform various tasks such as setting default values, initializing variables, or executing specific logic necessary for the object's proper instantiation. Constructors can be parameterized (accepting arguments) or default (with no arguments), allowing different ways to create objects with specific initializations. If no constructor is explicitly defined within a class, Java provides a default constructor, which initializes member variables to their default values.

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IT professional with 8.5 years of experience in Java, Spring, Oracle and related technologies.

Constructor is a special method to initialise Java objects. Usually initialisation logic is kept inside the constructor. Java compiler by default creates a default no arg constructor if no constructor is defined already.
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C language Faculty (online Classes )

What is a constructor in Java? In Java, a constructor is a term that describes a line of code used to create an instance of a class object. Since a Java class serves as a blueprint for a reusable object, Java language developers made a way to construct a copy of class objects.
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