What does constructor method mean in java

The constructor method in Java is a special method that is automatically called when an object is created to initialize the properties of the object and put it into a valid state. It can initialize an object's properties, perform specific operations, and execute the constructor chain. Java allows the use of overloaded constructors to create objects with different initialization parameters. The constructor is automatically called through the new keyword when creating an object. If it is not defined, a parameterless constructor will be automatically generated.

Constructor method in Java

Constructor method is a special method that is automatically called when creating an object . It is used to initialize the properties of an object and put it into a valid state.

The syntax of the constructor method

The constructor method has the same name as the class and has no return value type. The syntax is as follows:

public className() { // 初始化代码 }

The role of the constructor method

The construction method has the following functions:

• Initialize the properties of the object: You can assign initial values to the properties of the object through the construction method.
• Perform specific operations: The constructor method can perform specific operations, such as opening a connection, loading resources, etc.
• Execution of the constructor method chain: Through the constructor method chain, other overloaded constructors can be called.

Overloaded constructors

Java allows multiple constructors with the same name but different parameters, called overloaded constructors. This provides the flexibility to create objects with different initialization parameters.

Call of constructor method

The constructor method is automatically called when using the new keyword to create an object. For example:

MyClass object = new MyClass();

If no constructor is defined in the class, a parameterless constructor will be automatically generated.

Note

• Constructor methods cannot be overridden, but they can be overloaded.
• Constructors cannot be declared abstract or final.
• Constructor methods can throw exceptions.
• The default constructor in Java has no name and is automatically generated by the compiler.

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