Should you use setters in constructor?

10 Answers. You should use the constructor approach, when you want to create a new instance of the object, with the values already populated(a ready to use object with value populated). You set the value using a setter approach, when you want to change the value of a field, after the object has been created.

Which is better getter setter or constructor?

It takes less code to use a constructor than to create an object and use the setters. Sometimes you don’t need to set all the fields to specific values at the time of creating. For examle, when you make an array. Also, as already said, it’s safer when you use getters — you can’t get nullpointer.

What is getter and setter in constructor?

We can say another way i.e Constructor used for creating an object and setters used for changing the values inside object, getters() user for getting the values, this is only the main difference.

Is a constructor a getter?

Constructor : Used to intialise the object instance variables ( In the case of parameterized constructor). Only invoked once while object creation. Getters : Getters are used to get the instance variable values. Setters : These methods are used to modify the instance variable values.

When to use a constructor or a setter in Java?

Setter methods or constructors. so far I have seen two approaches of setting a variable’s value in Java. Sometimes a constructor with arguments is used, others setter methods are used to set the value of each variable. I know that a constructor initialises an instance variable inside a class once a class is instantiated using the “new” Keyword.

What’s the difference between constructor injection and setter injection?

There are many key differences between constructor injection and setter injection. Partial dependency: can be injected using setter injection but it is not possible by constructor. Overriding: Setter injection overrides the constructor injection. Changes: We can easily change the value by setter injection.

When to use setters instead of constructors in spring?

Spring supports both, and we can easily mix and match. But’ there are several “golden rules” when to use constructors and when to choose setters instead: Enforce mandatory dependencies: This is in-line with POJO constructor golden rule; mandatory dependencies are best to be declared and initialized in constructor method.

Can a java bean be used as a setter?

There are advantages to this approach as Java beans are supported out of the box in many frameworks like Struts and Spring. A class can also enforce mandatory availability of values by having such variables passed as parameters to a base constructor. And non-mandatory values can be set through other convenience constructors or setter methods.

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