Constructor-arg null

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For more information and examples, see Instance constructors and Using constructors. A constructor is a method whose name is the same as the name of its type. Its method signature includes only the method name and its parameter list; it does not include a return type.

The following example shows the constructor for a class named Person. If a constructor can be implemented as a single statement, you can use an expression body definition. The following example defines a Location class whose constructor has a single string parameter named name. The expression body definition assigns the argument to the locationName field. Sign in. Forgot your password? Get help. Privacy Policy. Password recovery.

Lombok NonNull annotation Examples. By Satish Varma. May 24, If we do not create any constructor, the Java compiler automatically create a no-arg constructor during the execution of the program.

This constructor is called default constructor. Here, we haven't created any constructors. Hence, the Java compiler automatically creates the default constructor. In the above program, the variables a and b are initialized with default value 0 and false respectively. Similar to Java method overloading , we can also create two or more constructors with different parameters.

This is called constructors overloading. In the above example, we have two constructors: Main and Main String language.

Here, both the constructor initialize the value of the variable language with different values. Based on the parameter passed during object creation, different constructors are called and different values are assigned. It is also possible to call one constructor from another constructor. Note : We have used this keyword to specify the variable of the class.

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