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Aug 16, 2016 · Java automatically generates a default (no arguments constructors) for classes that don't have any constructor. If you define another constructor (with arguments), default constructor will not be generated. If you still want one, you need to define it yourself. answered Sep 4, 2010 at 6:11. daphshez.
Dec 20, 2010 · 2. When we do not explicitly define a constructor for a class, then java creates a default constructor for the class. It is essentially a non-parameterized constructor, i.e. it doesn't accept any arguments. The default constructor's job is to call the super class constructor and initialize all instance variables.
1. This is because interfaces do not allow to define the method body in it.but we should have to define the constructor in the same class as interfaces have by default abstract modifier for all the methods to define. That's why we can not define constructor in the interfaces. edited Jul 12, 2013 at 5:13. NoNaMe.
Oct 23, 2015 · Java constructors are special methods that are called when an object is instantiated. In other words, when you use the new keyword. The constructor initializes the newly created object. package xyz; public class ConstructorExample {. private int x; private int y; public ConstructorExample(int x,int y){. this.x = x;
Nov 4, 2008 · Yes it can have a constructor and it is defined and behaves just like any other class's constructor. Except that abstract classes can't be directly instantiated, only extended, so the use is therefore always from a subclass's constructor. answered Nov 4, 2008 at 2:59. L. Cornelius Dol. 63.9k 26 141 189.
Dec 12, 2015 · Java provides a default constructor for a class when you do not define one ( in this case Student() ) . However, since defined the constructor Student( String s, char c, Date d, Preference p ) this default constructor is not automatically provided. You now have to either use the constructor you specified.
Jul 29, 2009 · For the sake of posterity, I'll suggest my solution for future readers: create a no-arg constructor in BaseClass but make it simply throw an UnsupportedOperationException or something. It's not the best solution (it falsely suggests that the class can support a no-arg constructor), but it's the best I can think of. –
If you know what value a final variable will have at declaration, it makes sense to initialize it outside the constructors. However, if you want the users of your class to initialize the final variable through a constructor, delay the initialization until the constructor. answered Oct 12, 2010 at 21:20. kasgoku.
Aug 17, 2013 · In Java, the default constructor is automatically generated by the compiler if you didn't defined it. So, when you define the following class: public class WeightIn { private double weight; private double height; // didn't define a constructor.
1. A constructor with or without parameters has a purpose of creating in object in order to access the methods in its class. With the no parameter constructor, you are able to create the object in order to access the methods in its class. Also, since it extends another class, any methods in that other class can also be accessed when you created ...
